Pcd diamond

FIELD: process engineering.

SUBSTANCE: invention relates to PCD diamond to be used in production of water-jet ejectors, engraving cutters for intaglio, scribers, diamond cutters and scribing rollers. PCD diamond is produced by conversion and sintering of carbon material of graphite-like laminar structure at superhigh pressure of up to 12-25 GPa and 1800-2600°C without addition of sintering additive of catalyst. Note here that sintered diamond grains that make this PCD diamond feature size over 50 nm and less than 2500 nm and purity of 99% or higher. Diamond features grain diameter D90 making (grain mean size plus grain mean size × 0.9) or less and hardness of 100 GPa or higher.

EFFECT: diamond features laminar or fine-layer structure, ruled out uneven wear, decreased abrasion.

15 cl, 5 tbl, 5 ex

 

The technical field

[0001] the Present invention relates to polycrystalline diamond obtained by the transformation and sintering of non-diamond carbon without the addition of sintering additives or catalysts.

The level of technology

[0002] Natural and synthetic single-crystal diamonds are still used in various assignments thanks to their excellent properties. Tool, comprising monocrystalline diamond is, for example, water-jet nozzle (patent document 1), engraving cutter for gravure printing (patent documents 2 and 3), Schreiber (patent document 4), a diamond cutting tool (patent documents 5 and 6) or schreibersi roller (patent document 7).

[0003] However, such a single-crystal diamond has the property, consisting in that the abrasion loss differ (uneven wear), depending on the orientations of the diamond crystals. For example, the loss of resistance varies significantly between the plane (111) and a plane (100). For this reason, monocrystalline diamond, used in the above-described tools, wear only in a specific plane in a short time as these tools are used, and the specified effects is provided, what was the problem.

Monocrystalline diamond also has the property ramkalawan the I along the plane (111). For this reason, when the single-crystal diamond is used in the instrument exposed when using mechanical tension, the tool is broken or cracked, which was a problem.

[0004] in Order to deal with the property of uneven wear and the property of cleaving single-crystal diamond, you can use sintered diamond. Such sintered diamond is produced by sintering fine crystalline diamond ("diamond grains") with a metal binder such as cobalt, and, therefore, this metal binder is present among the diamond grains. The area of the metal binder softer than the diamond grains, and so for a short time wears out. Since the amount of the binder is reduced, the diamond grains are detached, and the effects are not provided stably over a long period of time. There is also the problem, which is what happens adhesive wear between the area of the metal binder and the processed metal material, and therefore it is not possible to carry out processing for a long period of time.

[0005] in Order to solve the problem caused by the metal binder, you can get not containing a binder sintered diamond by dissolving a metal binder acid, thereby removing the metal binder. However, the pressure of the metal binder reduces the binding ability of the diamond grains, what is most likely to increase the loss by abrasion.

As for polycrystalline diamond, not containing a metal binder, there is a polycrystalline diamond obtained by chemical deposition from the gas or vapor phase (CVD). However, this polycrystalline diamond has a small strength of binding between the crystals and, therefore, suffers from a large loss on abrasion that was the problem.

[0006] Further specifically described above tools.

Water-jet nozzle, comprising monocrystalline diamond, had the problem, consisting in the fact that the target cutting width no longer was achieved after a time of use.

This is due to the following mechanism. In this nozzle, consisting of single-crystal diamond, diamond crystals on the inner surface of the nozzle channel have different orientation of the crystals relative to the environment. The nozzle having the shape of a cylinder at an initial stage of use, suffers from abrasion sensitive to abrasion plane for a short time. In the cylindrical nozzle is lost, and the inner surface extends to the shape of a polygon such as a hexagon.

[0007] in Order to overcome this deformation to the shape of a polygon, is caused by uneven wear, you can use the SQL sintered diamond (patent document 8). However, this causes a separation of the diamond grains by reducing the amount of binding, as described above, and the nozzle channel extends. Thus, the cutting width is not provided stably over a long period of time, which is a problem. In particular, water-jet nozzle, designed to provide increased efficiency of cutting, designed to release containing water and the hard particles of aluminum oxide or the like) of the liquid under high pressure. As a result, the area of the metallic binder, which is softer than the diamond grains, wears out in a short time, and the cutting width is not provided stably over a long period of time, which is a problem.

To cover the inner surface of the nozzle polycrystalline diamond with a non-metallic binder, you can use the method in which the inner surface of the channel of the metal nozzle is covered with a non-metallic binder thin diamond film by the CVD method (chemical deposition from the gas phase), as described above (see patent document 9). However, such a thin diamond film has a short life span up to wear and has a small strength of binding of the grains and, therefore, has a short lifetime to wear, that was the problem.

[0008] Another example I have is engraving cutter for gravure printing, in which natural or synthetic single crystal diamond is used as a material engraving cutter (see patent documents 2 and 3). However, perhaps due to the fact that this diamond has the property of splitting when using such a tool is broken or cracked under load, which is a problem. Because of the properties of uneven wear this diamond wears out only in a certain plane for a short time as tool use, and therefore, the processing cannot be performed for a long period of time, which was a problem.

[0009] Another example is Scriber (marking tool), including monocrystalline diamond. For example, as shown in patent document 4, the polygon shape of single-crystal diamond is used for marking single-crystal substrates, glass substrates, etc. vertex of the polygon, serving as a blade. This Scriber consisting of single-crystal diamond is produced by processing a single crystal diamond so that the plane (111), which is the most resistant to abrasion about the workpiece, which you will need to mark and which consists of a monocrystalline material, such as sapphire, have a special way, setting parallel C is cooking, you want to mark.

However, perhaps due to the fact that the single crystal diamond has the property of splitting along the plane (111), as described above, scribere consisting of monocrystalline diamond, crack or wear out unevenly, when used for marking a plane only slightly deviates from the plane (111)that was the problem.

[0010] Another example is a diamond cutting tool, in which natural or synthetic single crystal diamond is used as the material for the tool (see patent documents 5 and 6). However, because of problems related to the properties of the splitting and non-uniform wear of single-crystal diamond, as described above, this consisting of a single crystal diamond tool has a problem, which is that when using the tool is broken or cracked due to load, wear only in a specific plane in a short time as tool use, and processing for a long time impossible.

[0011] Another example is schreibersi video, in which the single-crystal diamond is used as a material scraborough roller. For example, as shown in patent document 7, lines form on fragile material, this AC is glass for liquid crystal panels, with the help of the V-shaped edges of the roller, serving as a cutting edge.

[0012] However, as with other tools, using this schreibersi roller is broken or cracked due to load due to problems associated with the property of cleaving single-crystal diamond that was the problem.

Because of the properties of uneven wear such a tool wears out only in a specific plane in a short time as tool use, and you cannot use the instrument for a long period of time, that was the problem. Consisting of monocrystalline diamond schreibersi roller has a V-shaped edge, in which the crystals have different orientation in the circumferential direction. Thus, the edge having the shape of a regular circle at the initial stage of use, wear in the wear plane for a short time, and the correct circular shape is deformed in the shape of a polygon. As a result, the roller can no longer roll that was the problem.

[0013] in Order to deal with properties cracking and uneven wear in the above-described various tools, as a material for tools you can use sintered diamond pressing unit containing a metal serving as a binder (PA is entie documents 7 and 10).

However, even though the use of sintered diamond, tend to experience the following issues: the scope of the metallic binder containing cobalt or the like, softer than the diamond grains, and therefore wears out in a short time, and is adhesive wear between the area of the metal binder and the processed metal material such as copper, and processing for a long period of time becomes impossible. Such metal binder in the sintered diamond pressing can be removed by dissolving the metal binding acid. However, this reduces the ability to bind the diamond grains that are very likely increases the loss by abrasion.

Polycrystalline diamond, which is produced by the CVD method and which does not contain metallic binder has a small bonding strength between grains and, therefore, probably has the problem, consisting in the fact that this diamond has a short lifespan to wear.

[0014] the Cited documents

Patent document 1: publication of unexamined patent application of Japan No. 2000-061897

Patent document 2: publication of unexamined patent application of Japan No. 2006-123137

Patent document 3: publication of unexamined patent application of Japan No. 2006-518699

Patent document 4: publication of unexamined application n is the Japan patent No. 2005-289703

Patent document 5: publication of unexamined patent application of Japan No. 2004-181591

Patent document 6: publication of unexamined patent application of Japan No. 2003-025118

Patent document 7: publication of unexamined patent application of Japan No. 2007-031200

Patent document 8: publication of unexamined patent application of Japan No. 10-270407

Patent document 9: publication of unexamined patent application of Japan No. 2006-159348

Patent document 10: international publication No. 2003/051784.

Disclosure of invention

Problems to be solved by the invention of

[0015] considering the above problems, the present invention is to provide polycrystalline diamond, applicable in a variety of applications, as well as water-jet nozzle, engraving cutter for gravure printing, Scriber, diamond cutting tools and schreibersi roller, which include such polycrystalline diamond.

In particular, the present invention is to offer a water-jet nozzle, which provides a cutting width stably for a long period of time, engraving cutter for gravure printing, Scriber, diamond cutting tools and schreibersi the roller, which make possible a stable processing in a long paragraph is the period of time in comparison with conventional instruments, including monocrystalline diamonds and sintered diamond pressing containing a metal binder.

Resolving problems

[0016] To solve the above problems, the authors of the present invention have conducted extensive studies. As a result, they found that polycrystalline diamond, not containing a metal binder such as cobalt, having an average grain diameter greater than 50 nm and less than 2500 nm, purity 99% or higher and the grain diameter D90 SPECA average (average grain diameter + 0,9 × average grain diameter) or less, advantageously applicable in a variety of fields of use. Thus, they have accomplished the present invention.

Specifically, the present invention aims, as described below, polycrystalline diamond, water-jet nozzle, engraving cutter for gravure printing, Scriber, diamond cutting tools and schreibersi roller, which include such polycrystalline diamond and allow you to perform stable processing for a long period of time.

[0017] <Polycrystalline diamond>

(1) Polycrystalline diamond obtained by the transformation and sintering of non-diamond carbon at high pressure and at high temperature without the addition of sintering additive or catalyst, and sintered diamond grains that make up for kristallicheskii diamond, have an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the diamond has a diameter of grain D90 average (average grain diameter + average grain diameter x 0.9) or less.

(2) Polycrystalline diamond according to the above item (1), and sintered diamond grains have a grain diameter D90 average (average grain diameter + average grain diameter × 0,7) or less.

(3) Polycrystalline diamond according to the above item (1), and sintered diamond grains have a grain diameter D90 average (average grain diameter + average grain diameter × 0.5 in) or less.

(4) Polycrystalline diamond according to any one of the above items (1)to(3), and polycrystalline diamond has a hardness of 100 GPA or more.

(5) Polycrystalline diamond according to any one of the above items (1)to(4), and Almazny carbon is a carbon material having graphite-like layered structure.

[0018] <Waterjet nozzle>

(6) Water-jet nozzle, comprising polycrystalline diamond according to any one of the above items(1)-(5).

(7) Water-jet nozzle according to the above item (6), and an internal surface formed in the polycrystalline diamond of the nozzle channel through which the waterjet fluid has a surface roughness Ra of 300 nm or less.

(8) Spand is oinoe nozzle according to the above item (6) or (7), moreover, formed in the polycrystalline diamond nozzle channel has a diameter of 10 μm or more and 500 μm or less.

(9) Water-jet nozzle according to any one of the above items (6)to(8), and the ratio (L/D) nozzle size (L) to the diameter formed in the polycrystalline diamond of the nozzle channel (D) is from 10 to 500.

(10) Water-jet nozzle according to the above item (6) or (7), and formed in polycrystalline diamond nozzle channel has a diameter of more than 500 μm and 5000 μm or less.

(11) Water-jet nozzle according to any one of the above items (6), (7) and (10), and the ratio (L/D) nozzle size (L) to the diameter formed in the polycrystalline diamond of the nozzle channel (D) is from 0.2 to 10.

[0019] <Engraving cutter for gravure>

(12) Engraving cutter for gravure printing, including polycrystalline diamond according to any one of the above items(1)-(5).

[0020] <Scriber>

(13) Scriber, including polycrystalline diamond according to any one of the above items(1)-(5).

(14) Scriber according to the above item (13), and the cutting edge on the tip of Scriber has the shape of a polygon with three or more faces, and these faces of the polygon, partially or completely, are used as a blade.

[0021] <Diamond cutting tools>

p> (15) Diamond cutting tool comprising polycrystalline diamond according to any one of the above items(1)-(5).

[0022] <Schreibersi video>

(16) Schreibersi roller comprising polycrystalline diamond according to any one of the above items(1)-(5).

Benefits

[0023] the Polycrystalline diamond according to the present invention is not susceptible to uneven wear and therefore is applicable in various fields of use.

Water-jet nozzle of the present invention can provide stable cutting width for a long period of time compared to conventional nozzles, comprising monocrystalline diamonds and sintered diamond pressing containing a metal binder.

Engraving cutter for gravure printing, Scriber, diamond cutting tools and schreibersi roller according to the present invention make possible a stable processing for a long period of time compared with conventional instruments, including single-crystal diamonds and sintered diamond pressing containing a metal binder.

The best ways of carrying out the invention

[0024] the Following describes in detail the polycrystalline diamond according to the present invention.

Polycrystalline diamond according to the present invention is essentially one who asny diamond (purity 99% or more) and does not contain metallic binder, such as cobalt. Such polycrystalline diamond can be obtained by directly transforming and simultaneously sintering serves as the source material Almazny carbon, such as graphite, glass carbon or amorphous carbon, diamond under high pressure and at high temperature (temperature: 1800°f to 2600°C, pressure: 12 to 25 HPa) without catalyst or solvent. The resulting polycrystalline diamond is not subjected to uneven wear, which actually occurs in single crystals.

[0025] it Should be noted that there is a method in which polycrystalline diamond is produced from diamond powder or graphite serving as the source material. Specifically, the ways in which receive polycrystalline diamonds from the diamond powder used as a starting material, and polycrystalline diamond obtained by these methods are disclosed in the following references 1-4.

Link 1: publication of unexamined patent application of Japan No. 2006-007677.

Link 2: publication of unexamined patent application of Japan No. 2002-187775.

Link 3: Japan patent No. 3855029.

Link 4: publication of unexamined patent application of Japan No. 2004-168554.

[0026] Reference 1 describes polycrystalline diamond, and the components of this polycrystalline diamond diamond grain ioutside grain diameter from 80 nm to 1 μm, that is in the range defined by the present invention. However, in the reference 1 indicates that polycrystalline diamond was obtained by the method described in reference 2. In reference 2 indicates that polycrystalline diamond produced by the method of sintering the diamond powder with carbonate, serving as a sintering additive, and the carbonate remains in the resulting polycrystalline diamond body after sintering. Consequently, the structure of polycrystalline diamond, described in reference 1, differs from the structure of polycrystalline diamond according to the present invention.

[0027] Another method of sintering the diamond powder with a sintering additive is described in reference 3. However, in reference 3 indicates that with the help of the IR spectra, it was found that sintering additive partially remains in the resulting polycrystalline diamond. Therefore, the structure of the polycrystalline diamond is also different from the structure of the polycrystalline diamond according to the present invention. In reference 4 indicates that the spectrum of the links 2 and 3 strength worse than spec without sintering additives of the present invention. Thus, reference 4 shows that the spec of the present invention is excellent.

[0028] the above reference 4 describes a method of obtaining a polycrystalline diamond to the m does not use a sintering additive. This method uses a diamond micropowder as source material, and the grain diameter of the resulting SPECA is 100 nm or less, which is within the range defined by the present invention. However, in the present invention as a starting material is used Almazny carbon. In particular, when the source material is a carbon material having graphite-like layered structure, may be provided with a polycrystalline diamond having a special structure called the plate or lamellar structure (from the English. "lamellar structure"), which is not present in the polycrystalline diamond on the link 4. In the undermentioned reference 5 indicates that in the region having such a lamellar structure, the propagation of cracks is suppressed. This demonstrates that the polycrystalline diamond according to the present invention is less prone to breakdown than the diamond described in reference 4.

In conclusion, polycrystalline diamond according to the present invention is completely different in structure from the diamond cakes, which were described previously, and the result has mechanical properties that are far superior to the characteristics of the latter.

[0029] the Following are examples of references describing methods of obtaining polycrystalline diamonds, to the x Almazny carbon material, serves as source material, turn and bake without the addition of sintering additive or catalyst at high pressure of 12 GPA or more and at a high temperature of 2200°C or more, as in the present invention.

Link 5: SEI technical review, 165 (2004) 68 (Sumiya et al.).

Link 6: publication of unexamined patent application of Japan No. 2007-22888.

Link 7: publication of unexamined patent application of Japan No. 2003-292397.

[0030] Of diamonds obtained by the methods described in the above references 5-7, produced a variety of tools and evaluated the performance characteristics of the resulting tools. Perhaps due to the fact that the diamond is described in reference 5 contains abnormally grown grains having a diameter of about 10 times the average diameter of the grain, and the diamond, described in reference 6 contains large diamond grains, which was transformed from the added coarse-grained material, the evaluation found that sites with such large grains wore out very quickly.

Then after a thorough research on how to eliminate such wear extremely fast sections, and found that it is necessary to control the distribution of the diameters of the sintered grains constituting the polycrystalline diamond. Accordingly, various tools, the floor is built with controlled distributions of the diameters of the grains, had a very fast moving grains and showed stable operating characteristics over a long period of time. Diamond described in reference 7, has an abnormal growth of grains, probably due to the fact that its production method similar to the method of reference 5. Diamond described in reference 7, also has a problem similar to the observed in reference 5.

[0031] the Above problem can be solved by using polycrystalline diamond, in which the sintered grains constituting the polycrystalline diamond, have an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the spec has a diameter D90 grain average (average grain diameter + 0,9 × average grain diameter) or less. This is because the abnormal wear is suppressed when performing grain diameter D90 of sintered grains of polycrystalline diamond components (average grain diameter + 0,9 × average grain diameter) or less.

[0032] the Average diameter of the grains in the present invention is srednesemennyh the diameter of the grain is determined using the transmission electron microscope (TEM). The average grain diameter and grain diameter D90 can be controlled by adjusting the diameter of the grain of the source material or conditions of sintering.

[0033] Next, followed by specific values for the mean grain diameter and grain diameter D90, which UD is vitoret the above value in polycrystalline diamond.

Example 1: when the average grain diameter is 60 nm, the grain diameter D90 is 114 nm or less.

Example 2: when the average grain diameter is 100 nm, the grain diameter D90 is 190 nm or less.

Example 3: when the average grain diameter is 500 nm, the grain diameter D90 is 950 nm or less.

[0034] the grain Diameter D90 is more preferable is (average grain diameter + 0,7 × average grain diameter) or less, and still more preferably (average grain diameter + 0,5 × average grain diameter) or less.

When the average grain diameter is 50 nm or less, or 2500 nm or more, the hardness becomes less than 100 HPa, and the wear is caused in a short period of time, and therefore, the width of the cutting't get stability for a long period of time.

[0035] Next will be described the water-jet nozzle of the present invention.

Since the material of the nozzle according to the present invention is the above-described polycrystalline diamond according to the present invention, the water-jet nozzle of the present invention is not subjected to uneven wear, as it occurs in the nozzles, consisting of single crystals.

[0036] the Authors present invention manufactured nozzle of diamonds obtained by the methods described in the above references 5-7, and determine who or width of the cutting nozzle data. This definition has revealed that the diamonds are obtained in accordance with these links contain large grains, as described above, and therefore, the portions that correspond to such large grains, wear out very quickly. In this case, on such sites the flow velocity of the water jet decreases and changes the direction of flow. In the cutting width decreases or increases over time of cutting, and the cutting width is not stable, and therefore not provided the desired width of cut, which was a problem.

[0037] the inventors have discovered that to obtain a stable desired width of cut necessary to eliminate such wear very quickly plots, and this is achieved by control of the distribution of diameters of the grains of cake. More specifically, the wear extremely quickly grains are eliminated in the nozzles, consisting of a diamond with a controlled distribution of the diameters of the grains, and this diamond is polycrystalline diamond according to the present invention, in which the polycrystalline diamond has an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the spec has a diameter D90 grain average (average grain diameter + 0,9 × average grain diameter) or less. Thus, the above problem was solved by using such a nozzle, and use this with the La can provide the desired cutting width stably for a long period of time.

[0038] Polycrystalline diamond used for water-jet nozzle of the present invention, preferably has an average grain diameter and grain diameter D90, which respectively satisfy the above-mentioned ranges.

The grain diameter D90 SPECA preferably chosen in accordance with the average diameter of the hard particles contained in the fluid that is used to handle pressure water jet. When the average diameter of the hard particles is essentially equal to or less than the average diameter of the grain structure SPECA, stable cutting width is not provided for a long period of time. This is because when the collision with the structure of the SPECA hard particles collide not many, and with a single grain surface SPECA, and when this surface is exposed to wear the orientation of the crystal grain wears out very quickly. For this reason, the diameter of the grains D90 SPECA nozzle is chosen so that it was 1/10 or less of the diameter of the hard particles.

It shows the following example with particular values.

Example 4: when the diameter of the hard particles is 50 μm, the D90 is 5 μm or less.

[0039] Polycrystalline diamond, forming a water-jet nozzle, preferably has a hardness of 100 GPA or more. When polycrystalline diamond has the firmness of the machine; is less than 100 HPa, the nozzle has a shorter service life.

The inner surface of the nozzle channel through which the waterjet fluid has a surface roughness Ra of 300 nm or less. When the surface roughness Ra is more than 300 nm, the nozzle has a shorter service life.

[0040] When formed in polycrystalline diamond nozzle channel has a diameter of 10 μm or more and 500 μm or less, the ratio (L/D) nozzle size (L) to the diameter of the nozzle channel (D) is preferably from 10 to 500.

When formed in polycrystalline diamond nozzle channel has a diameter of more than 500 μm and 5000 μm or less, the ratio (L/D) nozzle size (L) to the diameter of the nozzle channel (D) is preferably from 0.2 to 10.

[0041] Next will be described in detail engraving cutter for gravure printing according to the present invention.

Since the material engraving cutter for gravure printing according to the present invention is the above-described polycrystalline diamond according to the present invention, the engraving cutter for gravure printing according to the present invention is not subjected to uneven wear that occurs in engraving cutters for gravure printing, consisting of single crystals.

[0042] the Authors present invention manufactured engraving cutters with diamond obtained by methods op the toboggan in the above references 5-7, and tested on data engraving cutters. This inspection revealed that the diamonds obtained by the methods described in these references contain large grains, as described above, and therefore, the portions that correspond to such large grains, wear out very quickly. In this case, such sites are called banded scratches on the treated metal, and therefore, desired processing is not possible, what was the problem.

[0043] the inventors have discovered that to enable the desired stable processing it is necessary to exclude such extremely fast moving plots, and this is achieved by control of the distribution of diameters of the grains of cake. Accordingly, made engraving cutter comprising polycrystalline diamond with a controlled distribution of the diameters of the grains according to the present invention. Wearing extremely fast grain in this engraving cutter foreclosed and achieved the desired stable machining engraving cutter for a long period of time.

[0044] the Polycrystalline diamond according to the present invention includes a sintered diamond grains having a grain diameter D90 average (average grain diameter + 0,9 × average grain diameter) or less. In the result, it is possible to suppress abnormal wear.

Polycrystalline al is AZ, constituting engraving cutter for gravure printing, preferably has a hardness of 100 GPA or more. When polycrystalline diamond has a hardness of less than 100 HPa, engraving cutter has a shorter service life. When the average grain diameter is 50 nm or less, or 2500 nm or more, the hardness becomes less than 100 HPa, and wear occurs over a short period of time, and therefore, stable handling over a long period of time is impossible.

[0045] Next will be described Scriber of the present invention.

Since the material of Scriber according to the present invention is the above-described polycrystalline diamond according to the present invention, Scriber of the present invention is not subjected to uneven wear that happens in Scriber consisting of single crystals.

[0046] the above reference 1 describes Scriber consisting of polycrystalline diamond, and the components of the polycrystalline diamond of diamond grains of this scribere have an average grain diameter of from 80 nm to 1 μm, which is within the range defined by the present invention. However, as described above, polycrystalline diamond produced by the production method, described in reference 1 (reference 2), contains the remaining after sintering carbonate. That is why such policriti the " a diamond is different in structure from the polycrystalline diamond according to the present invention.

[0047] the Authors present invention manufactured scribere of diamonds obtained by the methods described in the above references 5-7, and was tested on data scribere. This inspection revealed that the diamonds obtained by the methods described in these references contain large grains, as described above, and therefore, the portions that correspond to such large grains, wear out very quickly.

The inventors have discovered that to enable the desired stable processing it is necessary to eliminate such wear very quickly plots, and this is achieved by control of the distribution of diameters of the grains of cake. Respectively, produced Scriber, including polycrystalline diamond with a controlled distribution of the diameters of the grains according to the present invention. Wearing extremely fast grain in this scribere foreclosed and achieved the desired stable processing scribere for a long period of time.

[0048] Polycrystalline diamond forming Schreiber, preferably has a hardness of 100 GPA or more. When the average grain diameter is 50 nm or less, or 2500 nm or more, the hardness becomes less than 100 HPa. When the hardness is less than 100 hPa, wear occurs over a short period of time, therefore, stable processing in accordance with their a long period of time is impossible, and this Scriber has a shorter service life.

[0049] Next will be described the diamond cutting tool according to the present invention.

Since polycrystalline diamond serving as the material of the diamond tool according to the present invention, represents the above-described polycrystalline diamond according to the present invention, polycrystalline diamond is essentially a single-phase diamond (purity 99% or more) and does not contain a metal binder such as cobalt. For this reason, the diamond cutting tool according to the present invention is not subjected to uneven wear that occurs in the diamond tools, including single crystals.

[0050] the Authors present invention made of diamond cutting tools diamond obtained by the methods described in the above references 5-7, and tested the performance of these instruments. This inspection revealed that the diamonds obtained by the methods described in these references contain large grains, as described above, and therefore, the portions that correspond to such large grains, wear out very quickly. In this case, such sites are called banded scratches or the like on the workpiece metal, and therefore, desired processing is not possible, what was the problem.

[0051] the Authors image is etenia found to enable the desired stable processing it is necessary to exclude such extremely fast moving plots, and this is achieved by control of the distribution of diameters of the grains of cake. Accordingly, the manufacturing of diamond tools, including polycrystalline diamond with a controlled distribution of the diameters of the grains according to the present invention. Wearing extremely fast grain in this tool foreclosed and achieved the desired stable processing tool for a long period of time.

[0052] Polycrystalline diamond comprising the diamond cutting tool, preferably has a hardness of 100 GPA or more. When polycrystalline diamond has a hardness of less than 100 HPa, wear occurs over a short period of time, and therefore, stable handling over a long period of time is impossible, and such a diamond tool has a shorter service life.

For this reason, the sintered grain polycrystalline diamond make having an average grain diameter of more than 50 nm and less than 2500 nm and a hardness of 100 GPA or more. When the average grain diameter is 50 nm or less, or 2500 nm or more, the hardness becomes less than 100 HPa.

Grain SPECA do have a grain diameter D90 average (average grain diameter + 0,9 × average grain diameter) Il is less in order to suppress abnormal wear.

[0053] Next will be described in detail schreibersi roller according to the present invention.

Since polycrystalline diamond serving as the material scraborough roller of the present invention, represents the above-described polycrystalline diamond according to the present invention, polycrystalline diamond is essentially a single-phase diamond (purity 99% or more) and does not contain a metal binder such as cobalt. For this reason schreibersi roller of the present invention is not subjected to uneven wear that occurs in scraborough rollers, including single crystals.

[0054] the Authors present invention produced schreibersi rollers made of polycrystalline diamond obtained by the methods described in the above references 5-7, and was tested on data schreibersi rollers. This inspection revealed that the diamonds obtained by the methods described in these references contain large grains, as described above, and therefore, the portions that correspond to such large grains, wear out very quickly.

[0055] the inventors have discovered that to enable the desired stable processing it is necessary to eliminate such wear very quickly plots, and this is achieved by controlling the distribution is of the diameters of the grains of cake. Accordingly, made schreibersi roller comprising polycrystalline diamond with a controlled distribution of the diameters of the grains according to the present invention. Wearing extremely fast grain in this scribimus video foreclosed and achieved the desired stable processing schreibersi roller for a long period of time.

[0056] Polycrystalline diamond comprising schreibersi roller preferably has a hardness of 100 GPA or more. When the average grain diameter is 50 nm or less, or 2500 nm or more, the hardness becomes less than 100 HPa. When the hardness is less than 100 HPa, wear occurs over a short period of time, and therefore, stable processing in a long time is not achieved, and schreibersi roller has a shorter service life.

Examples

[0057] Further, the present invention is described with reference to examples, in which the polycrystalline diamond according to the present invention are used as materials for the waterjet nozzles, engraving cutters for gravure printing, scribere, diamond cutting tools and schreibersi rollers.

Measurement methods and evaluation methods used in examples and comparative examples will be described.

[0058] <Average grain diameter and grain diameter D90>

The diameter is D50 grain (average grain diameters and the diameters of the D90 grain of graphite grains in the annealed graphite material and sintered diamond grains in the polycrystalline diamond in the present invention receive, conducting image analysis based on photographic images obtained by transmission electron microscope with magnification from 100000 to 500000.

Further, this method is described in detail.

First, the distribution of the diameters of the components of the sintered crystal grains is determined on the basis of images obtained by transmission electron microscope. Specifically, each grain is selected, the selected grain is subjected to the binarization (convert to binary) and calculate the area (S) of each grain using image analysis (e.g., Scion Image, made by the Corporation Scion Corporation). The diameter (D) of each grain is calculated as the diameter (D=2√(S/π)) of a circle having the same area as the grain.

Secondly, the resulting distribution of the diameters of the grains processed by the data analysis program (e.g., Origin, manufactured by OriginLab Corporation, Mathchad made by the Corporation Parametric Technology Corporation or similar) to calculate the diameter of D50 grain diameter and grain D90.

The transmission electron microscope used in the following examples and comparative examples, was a H-9000, manufactured by Hitachi, Ltd.

[0059] <Hardness>

Hardness in examples and comparative examples were measured by the indenter Copa with load measurement of 4.9 N.

< the Surface of the Naya roughness >

The surface roughness of the inner surface of the nozzle channel corrected by adjusting the diameters of the particles of the polishing composition for polishing the inner surface. Surface roughness was measured in accordance with JIS B0601 measuring the surface roughness of the contact type. Since the measuring probe cannot be inserted into the nozzle channel, cut and measured another nozzle separately manufactured in the same manner.

[EXAMPLE 1]Waterjet nozzle

[0060] Examples of nozzles according to the options of implementing the present invention are described below.

Examples 1-1 and 1-3 are examples in which varied surface roughness. Examples 1-4 - 1-6 represent examples in which varied the diameter of the nozzle channel. Examples 1-7 - 1-12 represent examples in which varied the average grain diameter and grain diameter D90. Examples 1-13 - 1-14 represent examples in which increased as the average grain diameter, and the diameter of the nozzle channel.

[Example 1-1]

[0061] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly the diamond under pressure, at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 290 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching up to 160 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was about 50 hours, which was very short.

[Example 1-2]

[0062] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result has been the polycrystalline diamond, having the average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 50 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 240 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was approximately 70 hours, which was very short.

[1-3]

[0063] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Received this about what atom polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 5 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 520 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was approximately 90 hours, which was very short.

[Example 1-4]

[0064] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had the diameter of the nozzle channel 450 μm, the nozzle size of 5 mm and a surface roughness Ra of 290 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel has expanded to 550 μm, and it was long, reaching 165 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was approximately 55 hours, which was very short.

[Example 1-5]

[0065] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel 50 μm, the nozzle size of 5 mm and a surface roughness Ra of 290 nm on the surface of the channel with the La. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 100 μm, and it was a long, amounting to 210 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was approximately 75 hours, which was very short.

[Example 1-6]

[0066] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel 15 μm, the size of the nozzle 7 mm and a surface roughness Ra of 290 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting,for which the diameter of the nozzle channel was expanded to 30 μm, and it was a long, amounting to 230 hours. For comparison purposes on the same property of cutting also assessed nozzle consisting of sintered diamond having an average diameter of crystal grains of 5 μm (containing cobalt binder), and this time was approximately 80 hours, which was very short.

[Example 1-7]

[0067] Graphite having an average grain diameter of 110 nm and a diameter of the D90 grain 175 nm, which is the average grain diameter + 0,7 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 230 nm and a diameter of the D90 grain 380 nm. Thus obtained polycrystalline diamond had extremely high hardness 115 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 280 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 180 hours.

[Example 1-8]

[0068] the Graphite, it is Mering average grain diameter of 95 nm, and the grain diameter D90 of 135 nm, what is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 180 nm and a diameter of the D90 grain 260 nm. Thus obtained polycrystalline diamond had extremely high hardness 125 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 280 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 210 hours.

[Example 1-9]

[0069] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result has been polycrystallites the rd diamond having the average grain diameter of 55 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had extremely high hardness 105 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 250 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 130 hours.

[Example 1-10]

[0070] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 9, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 560 nm and a diameter of the D90 grain 830 nm. Thus obtained polycrystalline diamond had extremely high hardness of 120 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and surface cher javatest Ra 240 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching up to 160 hours.

[Example 1-11]

[0071] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 9, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 1100 nm and the grain diameter D90 1600 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 250 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 150 hours.

[Example 1-12]

[0072] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average is iameter grain + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 9, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 270 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was long, reaching 110 hours.

[Example 1-13]

[0073] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 9, when the pressure at which diamond is thermodynamically stable. The result is e received polycrystalline diamond, having the average diameter of the grains of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel 1500 μm, the nozzle size of 5 mm and a surface roughness Ra of 270 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was extended to 2000 μm, and it was long, reaching 210 hours.

[Example 1-14]

[0074] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 9, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel 3500 μm, the size of the nozzle 0.7 mm and the surface is Yu roughness Ra 270 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel has grown to 4500 μm, and it was long, reaching up to 160 hours.

[Comparative Example 1-1]

[0075] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 350 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was short, accounting for 95 hours.

[Comparative Example 1-2]

[0076] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 210 nm, which is approximately (average grain diameter + ,1 × average grain diameter), prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 400 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 290 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was short, accounting for 90 hours.

[Comparative Example 1-3]

[0077] Graphite having an average grain diameter of 20 nm and a diameter of the D90 grain 37 nm, which is approximately (average grain diameter + 0,9 × average diameter of grains)was prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 45 nm and a diameter of the D90 grain 80 is m Thus obtained polycrystalline diamond had a hardness of 95 GPA and was slightly soft. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra of 250 nm on the surface of the nozzle channel. This nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was short, accounting for 80 hours.

[Comparative Example 1-4]

[0078] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is approximately (average grain diameter + 0,9 × average diameter of grains)was prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable over a long period of time. The result obtained polycrystalline diamond having an average grain diameter of 2700 nm and a diameter of the D90 grain 3900 nm. Thus obtained polycrystalline diamond had a hardness of 91 GPA and was slightly soft. From this polycrystalline material produced nozzle, and the nozzle had a diameter of the nozzle channel is 200 μm, the nozzle size of 5 mm and a surface roughness Ra 240 nm on the surface of the nozzle channel. Given the second nozzle was evaluated on the property waterjet cutting. Determined the time of cutting, for which the diameter of the nozzle channel was expanded to 300 μm, and it was short, accounting for 85 hours.

[0079] table I shows the values of sintered polycrystalline diamond grains in the above examples and comparative examples, the average diameter of the grain, the grain diameter D90, factor (K), hardness and durability to wear. It should be noted that the coefficient (K) is defined below in equation (1).

The grain diameter D90 = average grain diameter + average grain diameter × K ...(1).

[0080]

Table I
The average grain diameter (nm)D90 (nm)FactorHardness (GPA)Surface Serkova lead (nm)The diameter of the nozzle channel (D) (μm)The size of the nozzle (L) (mm)L/D*1)Lifetime (h)Lifetime Co-containing diamond (h)
Example 1-1200370 0,8511029020052516050
Example 1-22003700,851105020052524070
Example 1-32003700,85110520052552090
Example 1-42003700,8511029045051116555
Example 1-5 2003700,8511029050510021075
Example 1-62003700,8511029015746723080
Example 1-72303800,65115280200525180-
Example 1-81802600,44125280200525210-
Example 1-955800,45105250200525130-
Example 1-105608300,48120240200525160-
Example 1-11110016000,45112250200525150-
Example 1-12240035000,46102270200525/td> 110-
Example 1-13240035000,46102270150053210-
Example 1-14240035000,4610227035000,70,2160-
Comparative example 1, -12003700,8511035020052595-
Comparative example 1 -22004001,00112 29020052590-
Comparative example 1-345800,789525020052580-
Comparative example 1-4270039000,449124020052585-
*1)L/D = nozzle size (L)/diameter of the nozzle channel (D)

[EXAMPLE 2]Engraving cutter for gravure printing

[0081] Examples of engraving cutters for gravure printing according to the present invention and comparative examples are described below.

Method of assessment engraving cutters will be described in terms of wear resistance.

<Evaluation of wear resistance>

From the obtained polycrystallites the CSOs diamond made engraving cutter, with the adjacent angle of 120°. Copper billet was processed data, engraving cutter, driven with a frequency of 8 kHz, and estimated processing time for which the depth of wear of the edge of the linear portion on one side was increased to 10 μm. Wear engraving cutter was evaluated based on the processing time, defined as the service life of engraving cutter to wear.

[Example 2-1]

[0082] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. Engraving cutter, obtained from the polycrystalline diamond, had a long life to wear 240 hours. For comparison purposes were evaluated by the same working property engraving cutter, consisting of monocrystalline diamond, and this time was approximately 60 hours, which was extremely short.

<> [Example 2-2]

[0083] Graphite having an average grain diameter of 110 nm and a diameter of the D90 grain 175 nm, which is the average grain diameter + 0,7 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 230 nm and a diameter of the D90 grain 380 nm. Thus obtained polycrystalline diamond had extremely high hardness 115 GPA. Engraving cutter, obtained from the polycrystalline diamond, had a long life to wear 280 hours.

[Example 2-3]

[0084] Graphite having an average grain diameter of 95 nm, and the grain diameter D90 135 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 180 nm and a diameter of the D90 grain 260 nm. Thus obtained polycrystalline diamond had extremely high hardness 125 GPA. The grave is Navalny cutter, derived from this polycrystalline diamond, had a long life to wear 320 hours.

[Example 2-4]

[0085] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 55 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had extremely high hardness 105 GPA. From the obtained polycrystalline diamond produced engraving cutter with the adjacent angle of 120°. This engraving cutter, obtained from polycrystalline diamond, had a long life to wear to 200 hours.

[Example 2-5]

[0086] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 4, at a pressure p and which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 560 nm and a diameter of the D90 grain 830 nm. Thus obtained polycrystalline diamond had extremely high hardness of 120 GPA. Engraving cutter, made of this polycrystalline diamond, had a long life to wear 180 hours.

[Example 2-6]

[0087] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 5, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 1100 nm and the grain diameter D90 1600 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. Engraving cutter, made of this polycrystalline diamond, had a long life to wear 170 hours.

[Example 2-7]

[0088] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, slugas the th as source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 6, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. Engraving cutter, made of this polycrystalline diamond, had long service life up to 150 hours of wear.

[Comparative Example 2-1]

[0089] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 210 nm, which is the average grain diameter + 1,1 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 400 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. Engraving cutter, made of this polycrystalline diamond, had a short lifespan to wear 90 hours.

[Comparative Example 2-2]

[0090] Graphite having the average diameter is R 20 nm grain and the grain diameter D90 37 nm, what is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 45 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had a hardness of 95 GPA and was slightly soft. Engraving cutter, made of this polycrystalline diamond, had a short lifespan to wear to 85 hours.

[Comparative Example 2-3]

[0091] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2700 nm and a diameter of the D90 grain 3900 nm. Thus obtained polycrystalline diamond had a hardness of 91 GPA and was slightly soft. Engraving cutter, made of this polycrystallites the CSOs diamond had a short lifespan to wear 70 hours.

[Comparative Example 2-4]

[0092] Engraving cutter, made of monocrystalline diamond serving as the material was tested for abrasion resistance using the same method as in example 1, and this engraving cutter had a lifetime to wear 60 hours.

[0093] table II shows the values of sintered polycrystalline diamond grains in the above examples and comparative examples, the average diameter of the grain, the grain diameter D90, factor (K), hardness and durability to wear. It should be noted that the coefficient (K) is defined above in equation (1).

[0094]

Table II
The average grain diameter (nm)D90 (nm)Coefficient (K)Hardness (GPA)Service life up to wear and tear (h)
Example 2-12003700,85110240
Example 2-2 2303800,65115280
Example 2-31802600,44125320
Example 2-455800,45105200
Example 2-55608300,48120180
Example 2-6110016000,45112170
Example 2-7240035000,46102150
Comparative example 2-12004001,00 11290
Comparative example 2-245800,789585
Comparative example 2-3270039000,449170
Comparative example 2-4----60

[EXAMPLE 3]Schreiber

[0095] Examples of scribere of the present invention and comparative examples are described below.

Method of assessing scribere will be described in terms of wear resistance.

<Evaluation of wear resistance>

4-Point Scriber produced from the obtained polycrystalline material and exposed it to test the durability, where the sapphire substrate is used to mark scribere at a load of 50 g at a speed of scribing 1 cm/min and at a distance of scribing 1 m Resistance Schreiber was evaluated on the basis of loss on abrasion in this test.

[Example 3-1]

[0096] Graphite having the average is the average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, what is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/70 from loss of Scriber consisting of monocrystalline diamond.

[Example 3-2]

[0097] Graphite having an average grain diameter of 110 nm and a diameter of the D90 grain 175 nm, which is the average grain diameter + 0,7 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 230 nm and a diameter of the D90 grain 380 nm. Thus obtained polycrystalline diamond had extremely high hardness 115 GPA. Sweat the ri to the abrasion of scribere, made from the polycrystalline diamond were very low and amounted to approximately 1/80 from loss of Scriber consisting of monocrystalline diamond.

[Example 3-3]

[0098] Graphite having an average grain diameter of 95 nm, and the grain diameter D90 135 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 180 nm and a diameter of the D90 grain 260 nm. Thus obtained polycrystalline diamond had extremely high hardness 125 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/90 from loss of Scriber consisting of monocrystalline diamond.

[Example 3-4]

[0099] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond under pressure and, at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 55 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had extremely high hardness 105 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/60 loss of Scriber consisting of monocrystalline diamond.

[Example 3-5]

[0100] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 4, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 560 nm and a diameter of the D90 grain 830 nm. Thus obtained polycrystalline diamond had extremely high hardness of 120 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/50 loss of Scriber consisting of monocrystalline al the Aza.

[Example 3-6]

[0101] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 5, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 1100 nm and the grain diameter D90 1600 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/50 loss of Scriber consisting of monocrystalline diamond.

[Example 3-7]

[0102] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 6, when the pressure at which diamond is thermodynamically stable. The result is received polycrystalline diamond, having the average diameter of the grains of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. Abrasion loss of Scriber made from the polycrystalline diamond were very low and amounted to approximately 1/40 from loss of Scriber consisting of monocrystalline diamond.

[Comparative Example 3-1]

[0103] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 210 nm, which is the average grain diameter + 1,1 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 400 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. Abrasion loss of Scriber made from this polycrystalline diamond, approximately 1/4 of the loss of Scriber consisting of monocrystalline diamond.

[Comparative Example 3-2]

[0104] Graphite having an average grain diameter of 20 nm and a diameter of the D90 grain 37 nm, which is the average grain diameter + 0,9 × average grain diameter or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 45 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had a hardness of 95 GPA and was slightly soft. Abrasion loss of Scriber made from this polycrystalline diamond, approximately 1/3 of the losses Scriber consisting of monocrystalline diamond.

[Comparative Example 3-3]

[0105] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2700 nm and a diameter of the D90 grain 3900 nm. Thus obtained polycrystalline diamond had a hardness of 91 GPA and was slightly soft. Abrasion loss of Scriber made from this polycrystalline diamond, with whom were returned about 1/2 of the loss of scribere, consisting of monocrystalline diamond.

[0106] table III shows the values of sintered polycrystalline diamond grains in the above examples and comparative examples, the average diameter of the grain, the grain diameter D90, factor (K), hardness and loss resistance. It should be noted that the coefficient (K) is defined above in equation (1).

[0107]

Table III
The average grain diameter (nm)D90 (nm)Coefficient (K)Hardness (GPA)Abrasion loss
The ratio of the single crystal (reverse)
Example 3-12003700,8511068,0
Example 3-22303800,65 11579,3
Example 3-31802600,4412590,7
Example 3-45580810556,7
Example 3-55608300,4B12051,0
Example 3-6110016000,4511248,2
Example 3-7240035000,4610242,5
Comparative example 3-12004001,001123,6
Comparative example 3-24580 0,78953,4
Comparative example 3-3270039000,44912,8

[EXAMPLE 4]Diamond cutting tools

[0108] Examples of diamond cutting tools according to the options of implementing the present invention are described below.

Evaluation method of diamond cutting tools will be described in terms of wear resistance.

<evaluation of the resistance to wear (tool life)>

Cutting tools having adjacent corner edges 90°, and the edge R of 100 nm, were made from polycrystalline diamond obtained in the examples and comparative examples, and the data of the cutting tools used for forming grooves with the depth of 5 μm and a pitch of 5 μm in the metal plate, which consisted of a copper plate, which was coated with the layer of Nickel. The wear resistance of cutting tools has been evaluated on the basis of time (tool life), for which the edges of cutting tools wore out to about 1 micron.

[Example 4-1]

[0109] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, ready is for the non-diamond carbon, to serve as source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. Made from the polycrystalline diamond cutting tool had a very long life of 15 hours.

[Example 4-2]

[0110] Graphite having an average grain diameter of 110 nm and a diameter of the D90 grain 175 nm, which is the average grain diameter + 0,7 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 230 nm and a diameter of the D90 grain 380 nm. Thus obtained polycrystalline diamond had extremely high hardness 115 GPA. Made from the polycrystalline diamond cutting tool had a very long life of 18 hours.

[Example 4-3]

[0111] Graphite having an average grain diameter of 95 nm, and the grain diameter D90 of 135 nm, h is about equal to (average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 180 nm and a diameter of the D90 grain 260 nm. Thus obtained polycrystalline diamond had extremely high hardness 125 GPA. Made from the polycrystalline diamond cutting tool had a very long life to 20 hours.

[Example 4-4]

[0112] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 55 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had extremely high hardness 105 GPA. Made from the polycrystalline diamond cutting tool had a very long life of 13 hours.

[Example 4-5]

[0113] Graphite having an average diameter, the ETP grains of 30 nm, and the grain diameter D90 of 40 nm, what is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 4, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 560 nm and a diameter of the D90 grain 830 nm. Thus obtained polycrystalline diamond had extremely high hardness of 120 GPA. Made from the polycrystalline diamond cutting tool had a very long life of 11 hours.

[Example 4-6]

[0114] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 5, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 1100 nm and the grain diameter D90 1600 nm. Thus obtained polycrystalline diamond had extremely high TBE the weal 112 GPA. Made from the polycrystalline diamond cutting tool had a very long life of 10 hours.

[Example 4-7]

[0115] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 6, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond had extremely high hardness 102 GPA. Made from the polycrystalline diamond cutting tool had a very long life 9 hours.

[Comparative Example 4-1]

[0116] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 210 nm, which is the average grain diameter + 1,1 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. In the p who were given polycrystalline diamond, having the average grain diameter of 200 nm and a diameter of the D90 grain 400 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. Made from the polycrystalline diamond cutting tool had a life of 6 hours.

[Comparative Example 4-2]

[0117] Graphite having an average grain diameter of 20 nm and a diameter of the D90 grain 37 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 45 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had a hardness of 95 GPA and was slightly soft. Made from the polycrystalline diamond cutting tool had a life of 5 hours.

[Comparative Example 4-3]

[0118] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a non-diamond carbon, which serves as the source material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2700 nm and a diameter of the D90 grain 3900 nm. Thus obtained polycrystalline diamond had a hardness of 91 GPA and was slightly soft. Made from the polycrystalline diamond cutting tool had a life of 4 hours.

[Comparative Example 4-4]

[0119] the Tool is made of monocrystalline diamond serving as the material was tested for abrasion resistance using the same method as in example 1, and the tool had a life of 3 hours.

[0120] table IV shows the values of sintered polycrystalline diamond grains in the above examples and comparative examples, the average diameter of the grain, the grain diameter D90, factor (K), hardness and tool life. It should be noted that the coefficient (K) is defined above in equation (1).

[0121]

Table IV
The average grain diameter (nm)The grain diameter D90 (nm)Coefficient (K)Hardness (GPA)The service life of the instrument (hour)
Example 4-12003700,8511015
Example 4-22303800,6511518
Example 4-31802600,4412520
Example 4-455800,4510513
Example 4-55608300,4812011
Example 4-6110016000,4511210
Example 4-7240035000,461029
2004001,001126
Comparative example 4-245800,78955
Comparative example 4-3270039000,44914
Comparative example 4-4----3

[EXAMPLE 5]Schreibersi movie

[0122] the Following describes examples schreibersi rollers according to the options of implementing the present invention.

Method of assessment schreibersi rollers will be described in terms of properties scribing.

<Evaluation of properties scribing>

Schreibersi rollers having a diameter of 3 mm, a thickness of 0.8 mm and the adjacent corner edges 120°, made of polycrystalline diamond obtained in the examples and comparative examples. Data schreibersi rollers used for scribing glass substrates,and the property scribing schreibersi rollers evaluated, determining passed when schreberiana distance.

[Example 5-1]

[0123] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 370 nm. Thus obtained polycrystalline diamond had extremely high hardness of 110 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 300 km

[Example 5-2]

[0124] Graphite having an average grain diameter of 110 nm and a diameter of the D90 grain 175 nm, which is the average grain diameter + 0,7 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 230 nm and a diameter of the D90 grain 380 nm. Received this about what atom polycrystalline diamond had extremely high hardness 115 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 350 km

[Example 5-3]

[0125] Graphite having an average grain diameter of 95 nm, and the grain diameter D90 135 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 180 nm and a diameter of the D90 grain 260 nm. Thus obtained polycrystalline diamond had extremely high hardness 125 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 400 km

[Example 5-4]

[0126] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which Alma which is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 55 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had extremely high hardness 105 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 250 km

[Example 5-5]

[0127] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 4, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 560 nm and a diameter of the D90 grain 830 nm. Thus obtained polycrystalline diamond had extremely high hardness of 120 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 230 km

[Example 5-6]

[0128] Graphite having the average grain diameter is 30 nm and the grain diameter D90 of 40 nm, what is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 5, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 1100 nm and the grain diameter D90 1600 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 210 km

[Example 5-7]

[0129] Graphite having an average grain diameter of 30 nm and the grain diameter D90 of 40 nm, which is the average grain diameter + 0,5 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in diamond over a longer time than in example 6, when the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2400 nm and a diameter of the D90 grain 3500 nm. Thus obtained polycrystalline diamond kilcline high hardness 102 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, polycrystalline diamond was scribing the long distance of about 190 km

[Comparative Example 5-1]

[0130] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 210 nm, which is the average grain diameter + 1,1 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 200 nm and a diameter of the D90 grain 400 nm. Thus obtained polycrystalline diamond had extremely high hardness 112 GPA. The resulting polycrystalline material was evaluated in terms of scribing. In this case, the polycrystalline diamond was conducted by scribing only for a short distance, approximately 120 km

[Comparative Example 5-2]

[0131] Graphite having an average grain diameter of 20 nm and a diameter of the D90 grain 37 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly the diamond under pressure, at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 45 nm and a diameter of the D90 grain 80 nm. Thus obtained polycrystalline diamond had a hardness of 95 GPA and was slightly soft. The resulting polycrystalline material was evaluated in terms of scribing. In this case, the polycrystalline diamond was conducted by scribing only for a short distance, approximately 110 km

[Comparative Example 5-3]

[0132] Graphite having an average grain diameter of 100 nm and a diameter of the D90 grain 180 nm, which is the average grain diameter + 0,9 × average grain diameter) or less, prepared as a starting material for diamond. This material was directly turned and specaly in the diamond at the pressure at which diamond is thermodynamically stable. The result obtained polycrystalline diamond having an average grain diameter of 2700 nm and a diameter of the D90 grain 3900 nm. The resulting polycrystalline material was evaluated in terms of scribing. In this case, the polycrystalline diamond was conducted by scribing only for a short distance, approximately 90 km

[Comparative Example 5-4]

[0133] Schreibersi roller made of single-crystal diamond and univali in terms of scribing. In this case, the single-crystal diamond was conducted by scribing at a short distance of only 100 km

[Comparative Example 5-5]

[0134] Schreibersi roller made of sintered diamond pressing with a metal binder and evaluated in terms of scribing. As a result of this sintered diamond pressing was conducted by scribing at a short distance of only 6 km

[0135] table V shows the values of sintered polycrystalline diamond grains in the above examples and comparative examples, the average diameter of the grain, the grain diameter D90, coefficient, hardness and tool life. It should be noted that the coefficient (K) is defined above in equation (1).

[0136]

Table V
The average grain diameter (nm)The grain diameter D90 (nm)Coefficient (K)Hardness (GPA)Distance scribing (km)
Example 5-12003700,85 110300
Example 5-22303800,65115350
Example 5-31802600,44125400
Example 5-455800,45105250
Example 5-55608300,48120230
Example 5-6110016000,45112210
Example 5-7240035000,46102190
Comparative example 5-1200400112120
Comparative example 5-245800,7895110
Comparative example 5-3270039000,449190
Comparative example 5-4----100
Comparative example 5-5----6

Industrial applicability

[0137] Polycrystalline diamond used in the present invention is less prone to uneven wear and makes possible stable handling over a long period of time compared to conventional monocrystalline diamond and sintered diamond compacts containing a metal binder. Therefore, such a polycrystalline diamond can appropriately be used WideString nozzles, engraving cutters for gravure printing, Scriber, diamond cutting tool and schreibersi rollers.

[0138] the Water-jet nozzle of the present invention can provide stable cutting width for a long period of time compared to conventional nozzles and, therefore, it can suitably be used as a nozzle for water jet, designed to propel containing hard particles of aluminum oxide or the like) of fluid under high pressure, to thereby cutting or processing of the workpiece.

1. Polycrystalline diamond obtained by the transformation and sintering of non-diamond carbon at high pressure from 12 to 25 GPA and high temperatures from up to 1800ºC 2600 º C without the addition of sintering additive or catalyst, and sintered diamond grains that make up this polycrystalline diamond, have an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the diamond has a diameter of grain D90 average (average grain diameter + average grain diameter x 0.9) or less, and polycrystalline diamond has a hardness of 100 GPA or more, and Almazny carbon is a carbon material, having graphite-like layered structure.

2. Polycrystalline diamond according to claim 1, and sintered diamond grains have a diameter of ze is on the D90, average (average grain diameter + average grain diameter × 0,7) or less.

3. Polycrystalline diamond according to claim 1, and sintered diamond grains have a grain diameter D90 average (average grain diameter + average grain diameter × 0.5 in) or less.

4. Waterjet nozzle containing polycrystalline diamond according to claim 1, and an internal surface formed in the polycrystalline diamond of the nozzle channel through which the waterjet fluid has a surface roughness Ra of 300 nm or less.

5. Water-jet nozzle according to claim 4, whereby the said nozzle channel has a diameter of 10 μm or more and 500 μm or less.

6. Water-jet nozzle according to claim 4, and a ratio (L/D) size (L) nozzle diameter (D) of the above-mentioned nozzle channel is from 10 to 500.

7. Water-jet nozzle according to claim 4, whereby the said nozzle channel has a diameter of more than 500 μm and 5000 μm or less.

8. Water-jet nozzle according to claim 4, and a ratio (L/D) size (L) nozzle diameter (D) of the above-mentioned nozzle channel is from 0.2 to 10.

9. Engraving cutter for gravure printing, containing polycrystalline diamond according to claim 1.

10. Scriber containing polycrystalline diamond according to claim 1.

11. Scriber of claim 10, with the cutting edge on the tip of Scriber has the shape of a polygon with three or more faces, and these faces of the polygon, frequent is a rule or fully, used as a blade.

12. Diamond cutting tool containing polycrystalline diamond according to claim 1.

13. Schreibersi roller containing polycrystalline diamond according to claim 1.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to technology of obtaining single crystal diamond material for electronics and jewellery production. Method includes growing single crystal diamond material by method of chemical precipitation from vapour or gas phase (CVD) on main surface (001) of diamond substrate, which is limited by at least one rib <100>, length of said at least one rib <100> exceeds the longest surface dimension, which is orthogonal to said at least one rib <100>, in ratio at least 1.3:1, and single crystal diamond material grows both on the normal to the main surface (001) and sideward from it, and during CVD process value α constitutes from 1.4 to 2.6, where α=(√3×growth rate in <001>) ÷ growth rate in <111>.

EFFECT: invention makes it possible to obtain larger in area diamond materials with low density of dislocations.

14 cl, 8 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: diamond-like coatings are produced in vacuum by spraying of target material with an impulse laser. The target material made of graphite of high degree of purity (more than 99.9%) is exposed to combined laser radiation: first short-wave (less than 300 nm) pulse radiation, the source of which is a KrF-laser with wavelength of 248 nm and specific energy of 5·107 W/cm2, as a result of which ablation is carried out, and gas-plasma phase of target material is generated. Subsequent exposure of a gas-plasma cloud during cloud flight from a target to a substrate is carried out by long-wave (more than 1 mcm) laser radiation. The source of long-wave laser radiation is a gas CO2-laser or a solid-state fibrous laser radiator.

EFFECT: increased diamond phase in a produced coating and increased energy spectrum of plasma at stage of its flight.

3 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to technology of production of synthetic diamond material, which can be applied in electronic devices. Diamond material contains single substituting nitrogen (Ns0) in concentration more than 0.5 ppm and having such complete integral absorption in visible area from 350 nm to 750 nm, that at least nearly 35% of absorption is attributed to Ns0. Diamond material is obtained by chemical deposition from vapour or gas phase (CVD) on substrate in synthesis medium, which contains nitrogen in atomic concentration from nearly 0.4 ppm to nearly 50 ppm, and gas-source contains: atomic part of hydrogen, Hf from nearly 0.40 to nearly 0.75, atom part of carbon, Cf, from nearly 0.15 to nearly 0.30; atomic part of oxygen, Of, from nearly -.13 to nearly 0.40; and Hf+Cf+Of=1; ratio of atomic part of carbon to atomic part of oxygen, Cf:Of, satisfy the ratio nearly 0.45:1<Cf:Of< nearly 1.25:1; and gas-source contains atoms of hydrogen, added in form of hydrogen molecules, H2, with atomic part of the total quantity of present atoms of hydrogen, oxygen and carbon between 0.05 and 0.40; and atomic parts of Hf, Cf and Of represent parts from the total quantity of atoms of hydrogen, oxygen and carbon, present in gas-source.

EFFECT: invention makes it possible to obtain diamond material with rather high content of nitrogen, which is evenly distributed, and which is free of other defects, which provides its electronic properties.

17 cl, 11 dwg, 6 ex

FIELD: metallurgy.

SUBSTANCE: monocrystalline diamond material that has been grown using a CVD method and has concentration of single substituent nitrogen [Ns0] of less than 5 ppm is irradiated to introduce isolated vacancies V to at least some part of the provided CVD-diamond material so that total concentration of isolated vacancies [VT] in the obtained diamond material is at least more than (a) 0.5 ppm and (b) by 50% more than concentration [Ns0] in ppm in the provided diamond material; after that, annealing of the obtained diamond material is performed so that chains of vacancies can be formed from at least some of the introduced isolated vacancies at the temperature of at least 700°C and maximum 900°C during the period of at least 2 hours; with that, irradiation and annealing stages reduce the concentration of isolated vacancies in diamond material, due to which concentration of isolated vacancies in the irradiated and annealed diamond material is <0.3 ppm.

EFFECT: diamonds obtain fancifully orange colour during such treatment.

16 cl, 3 dwg, 4 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to diamond grinding in making diamond rock cutting tool. Proposed method comprises processing the diamonds in velocity layer of magnetic fields together with ferromagnetic particles. Mix composed of ferromagnetic particles and diamond grains fills the cylindrical case by 0.25-0.35 of its volume. Diamond magnetic susceptibility is defined by the relationship: X1gR1(R1+R2)224μ0ρ2R22H2X2, where X1, X2 are diamond and ferromagnetic particle magnetic susceptibility, m3/kg; g is acceleration of gravity, m/s2; R1, R2 are diamond and ferromagnetic particle grain radii, m; µ0 is magnetic permeability of vacuum, (µ0=4π·107 GN/m); ρ2 is ferromagnetic particle density, kg/m3; H is magnetic field intensity, A/m. Note here that the relationship between diamond grain weight and that of ferromagnetic particles makes 0.51-0.61.

EFFECT: higher efficiency of grinding and quality of finished diamonds.

1 cl, 2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: method of making monocrystalline and polycrystalline diamond plates with a large surface area involves arranging, without touching each other, workpiece monocrystals with surface orientation (100) on a substrate holder, creating nucleation centres on the surface of the substrate holder free from the workpiece monocrystals, simultaneous chemical vapour deposition (CVD) of an epitaxial layer on the surface of workpiece monocrystals and a polycrystalline diamond film on the remaining surface of the substrate holder. As a result of chemical vapour deposition of the diamond, splicing of monocrystalline and polycrystalline diamond takes place on the side surface of the workpiece monocrystals to form a diamond plate of a large surface area, having spliced monocrystalline and polycrystalline diamonds. To obtain a plane-parallel CVD diamond plate, the grown composite diamond substrate is polished on both sides.

EFFECT: obtaining plates of monocrystalline and polycrystalline CVD diamond of a large surface area, having a common smooth outer surface.

5 cl, 7 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of synthetic polycrystalline materials based on polycrystalline cubic boron containing diamond grains. Said materials are used for making cutting elements to be incorporated with drill bits, grinding wheel dressing, drilling and cutting of natural and artificial construction materials. Proposed method comprises subjecting the blend containing cubic boron nitride and diamond powder to pressure in the range of thermal stability of aforesaid components at state graphs. Note here that grain sixe of diamond powder used in amount of 5.0-37.5 vol. % makes 200-3000 mcm while that of hexagonal boron nitride makes 1-3 mcm and that of cubic boron nitride makes 1-5 mcm.

EFFECT: higher efficiency in drilling rocks of V-XII rock drillability index.

3 cl

FIELD: chemistry.

SUBSTANCE: method involves decomposition of solid carbonyl compounds of platinum metals in a gaseous medium at high temperature in a sealed container to form diamonds and doping said diamonds with boron at temperature of 150°C-500°C for 2-5 hours in a gaseous medium which contains carbon monoxide CO and diborane B2H6 with weight ratio of boron to carbon in the gaseous mixture of 1:100-1000.

EFFECT: obtaining high quality diamond monocrystals with semiconductor properties.

1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical and jewellery industry. Diamonds are synthesised in a high-frequency induction crucible furnace with frequency range of 60-100 kHz. A ceramic crucible 1 is fitted with a ceramic grid 2 with holes with diameter of 0.3-0.5 mm, lying at a height of 20 mm from its bottom, and a ceramic pipe 3 with inner diameter of 15-20 mm for feeding a mixture of methane and carbon dioxide with specific volume rate of 60-70 h-1. Sodium carbonate and potassium carbonate are fed into the crucible 1, said carbonates being mixed in equimolecular ratio and heat treated at 400-450°C for 2 hours. Diamond synthesis is carried out in one day at temperature of 700-900°C in a melt of said salts in the presence of a catalyst - powdered iron with granule size of 3-5 mm in amount of 5-10% of the molten mass. Gas supply is cut at the end of the process. The molten salts, along with the catalyst and diamonds, are poured into moulds. The cooled down ingots are fed into a reactor - crystalliser 5. After dissolving the sodium carbonate and potassium carbonate, the suspension of catalyst and diamonds is fed onto a filter 6.The obtained filtrate is used in the reactor-crystalliser 5, and the diamond crystals are separated from the catalyst by a magnet.

EFFECT: invention simplifies the process, increases efficiency of the process and excludes toxic and explosive substances.

FIELD: process engineering.

SUBSTANCE: invention relates to production of diamonds and diamond polycrystalls. Proposed method comprises subjecting blend bearing carbon material and catalyst to pressure and temperature in the region of diamond thermodynamic stability. Catalyst represents a mix of metallic component with phosphorus, or the mix of alloys. Metallic component is selected from the group: iron, manganese, silicon. Metallic component-to-phosphorus ratio is selected so that to allow synthesis at temperature not exceeding 1450°C. Additionally, alloying metal may be added to said blend selected from the group: B, Si, Ti, Zr, Cr, Ni, Mo, Vo, or their mix, or alloy.

EFFECT: higher-strength and fraction resistance diamonds.

7 cl, 1 tbl, 4 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of synthetic polycrystalline materials based on polycrystalline cubic boron containing diamond grains. Said materials are used for making cutting elements to be incorporated with drill bits, grinding wheel dressing, drilling and cutting of natural and artificial construction materials. Proposed method comprises subjecting the blend containing cubic boron nitride and diamond powder to pressure in the range of thermal stability of aforesaid components at state graphs. Note here that grain sixe of diamond powder used in amount of 5.0-37.5 vol. % makes 200-3000 mcm while that of hexagonal boron nitride makes 1-3 mcm and that of cubic boron nitride makes 1-5 mcm.

EFFECT: higher efficiency in drilling rocks of V-XII rock drillability index.

3 cl

FIELD: process engineering.

SUBSTANCE: invention relates to production of polycrystalline cubic nitride with fine-grain structure. Cubic boron nitride-based polycrystalline material is produced by applying high pressure and temperature to charge containing composite powder with grain size of 4-100 nm including hexagonal boron nitride and aluminium nitride at the ratio of (4-6):1. Composite powder is produced by CBC-technology from boron-aluminium-nitrogen-containing compounds. Process is conducted at 60-120 kbar and 1700-2400°C in the region of thermodynamic stability of cubic boron for 15-60 s.

EFFECT: higher wear resistance and edge stability in processing high-alloyed steel and refractory nickel alloys.

3 cl

FIELD: process engineering.

SUBSTANCE: invention relates to producing cubic boron nitride-based polycrystalline material. Proposed method comprises subjecting charge containing composite powder BNr+AIN with grain size of 4-100 nm obtained in SAA-process from boron-aluminium-nitrogen-containing compounds, cubic boron nitride and catalyst, to high pressure and temperature, at the following ratio of components, in wt %: BNr+AIN - 65-75, cubic BNr - 15-25, catalyst - 3-10. Ratio of hexagonal boron nitride to aluminium nitride in composite powder makes (4-6):1.Grain size of cubic boron nitride powder may make 1-40 mcm. Additionally, powder of hexagonal boron nitride with grain size of 1-40 mcm in amount of 1-15% wt % or silicon in amount of 0.1-1 wt % may be added to said charge. Synthesis is conducted at 60-120 kbar and 1700-2400°C for 15-60 s.

EFFECT: higher wear resistance.

5 cl, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of synthetic superhard materials, particularly, polycrystalline cubic boron at high pressure and temperature to be sued in chemical, electronic and other industries. Proposed method comprises preparing mix of wurtzite-like and cubic modifications in relation of 1:4 to 2:1, respectively, processing it in planet mill for mechanical activation and crushing to grain size not exceeding 1 mcm, forming and annealing the mix at 1400-1800°C and 7.0-9.0 GPa, keeping at annealing temperature for time defined by conditions of transition on boron nitride wurtzite modification into cubic one without recrystallisation, equal to 5-30 s. Accurate time of keeping at preset temperature and pressure is defined proceeding from necessity of preservation of 5 to 15% of wurtzite boron nitride amount in initial mix.

EFFECT: lower temperature, pressure and duration of synthesis, improved mechanical and physical properties.

2 cl, 5 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to production of optical materials which are transparent in the infrared (IR) spectrum with high transmission coefficient and high mechanical strength. The method involves preparation of a colloidal solution from finely dispersed γ-Al2O3 powder, from which a transparent supernatant - sol is extracted, which, through ultrasonic treatment, heating, acidification and thickening, is brought into a state gelling takes place after several days - formation of a viscous sol which is poured into a moulding hydrophobic container, where the said sol is kept until a moulded volume of gel is formed - gel workpiece. After removal from the mould, the gel workpiece undergoes thermal treatment in several steps, preferably three steps, where in each subsequent step temperature is approximately doubled, and the obtained polycrystalline mechanical strong material undergoes sintering at 1200-1750°C at pressure of 30-300 MPa for 20-30 minutes, after which temperature of furnace is brought down to ambient temperature under inert conditions.

EFFECT: invention enables to obtain high-quality optical polycrystalline material from structured elements with dimensions of several nanometres and having high optical transparency in the visible an infrared spectra and high mechanical strength which is 3-5 times higher than that of ceramics with micro-sized particles, as well as obtaining material for the input lens of a photodetector which, while retaining main optical parametres, has properties required for material for this purpose - heat resistance, thermophysical stability in a high-temperature plasma current.

6 cl, 1 ex, 1 tbl

FIELD: physics.

SUBSTANCE: proposed laser material is a ceramic polycrystalline microstructure substance with particle size of 3-100 mcm, containing a twinned nanostructure inside the particles with size of 50-300 nm, made from halides of alkali, alkali-earth and rare-earth metals or their solid solutions, with vacancy or impurity laser-active centres with concentration of 1015-1021 cm-3. The method involves thermomechanical processing a monocrystal, made from halides of metals, and cooling. Thermomechanical processing is done until attaining 55-90% degree of deformation of the monocrystal at flow temperature of the chosen monocrystal, obtaining a ceramic polycrystalline microstructure substance, characterised by particle size of 3-100 mcm and containing a twinned nanostructure inside the particles with size of 50-300 nm.

EFFECT: improved mechanical properties, increased microhardness and failure viscosity.

5 cl, 1 tbl, 4 ex, 1 dwg

FIELD: manufacture of polycrystal superhard materials on base of dense modifications of borazon and wurtzite-like boron.

SUBSTANCE: borazon and wurtzite-like boron may be used as materials for parts of high-pressure apparatus and tools in treatment of wear-resistant materials, first in sharpening heat-treated steels, gray and high-strength cast irons, tungsten-containing hard alloys, reinforced concrete, stone and plastics. Proposed method includes subjecting boron nitride to action of pressure from 6.5 to 9 Gpa at high temperature for 2-3 min, after which temperature is reduced to room magnitude and pressure is reduced to atmospheric level at rate of 200°C per Gpa to 250°C per Gpa. Used as borazon is wurtzite-like boron or mixture of wurtzite-like boron and borazon at its content 0f from 0 to 50 mass-%; process is performed at temperature of from 1500°C to 2200°C in field of their stability under isothermal conditions; temperature gradient of from 20°C/mm to 70°C/mm may be additionally created in direction of reaction cell axis. Borazon and wurtzite-like boron are placed in reaction cell layer-by-layer perpendicularly to cell axis; composition of one layer differs from that of adjacent layer in content of wurtzite-like boron and borazon; graininess of borazon ranges from 3/2 mcm to 200/160 mcm.

EFFECT: enhanced efficiency; possibility of producing flaw-free material possessing high strength.

3 cl, 11 dwg, 1 tbl, 11 ex

FIELD: jewelry technology; manufacture of jewelry colored inserts.

SUBSTANCE: synthetic corundum contains alumina, color-forming additives and binder-paraffin. Required color is obtained as follows: for obtaining black color molybdenum oxide is added to alumina in the amount of 0.03%; for obtaining gray color, tungsten oxide is added to alumina in the amount of 0.01%; for obtaining blue color, neodymium oxide is added in the amount of 0.01%; for obtaining pink color, erbium oxide is added to alumina in the amount of 0.01%; for obtaining red color, chromium oxide is added in the amount of 0.05%. Proposed method of manufacture of jewelry articles includes molding in casting machines at a pressure of 4 atm and roasting; first roasting cycle is performed in continuous furnaces for burning-out the binder and is continued for 90 h at temperature of 1150 C; second roasting cycle is performed in batch furnaces at temperature of 1750 C and is continued for 170 h for forming and sintering of microcrystals making translucent crock at density of 4 g/cu cm and hardness of 9 according to Mohs hardness scale; then polishing is performed with the aid of diamond materials. Articles thus made have high-quality miniature texture at hardness which is disadvantage in relation to diamond only.

EFFECT: high quality of articles; enhanced hardness of articles.

7 cl

FIELD: chemical technology, in particular production of polycrystalline batch for wurtzite-structure single crystal growth.

SUBSTANCE: claimed method for production of polycrystalline batch for wurtzite-structure oxide single crystal growth of formula LiMeO2, wherein Me refers aluminum or gallium, includes mixing of metal (Me) oxide with lithium carbonate in stoichiometric ratio and sintering in crucible. Starting materials before mixing are crushed to provide particles of size not more than 2 mum and heated in limits of their stability. Sintering is carried out at temperature being equal to 87-88 % of single crystal melting point, for 6 h in alundum crucible. Said wurtzite-structure single crystals are useful in substrate preparation for epitaxial growth of gallium nitride. Method of present invention makes it possible to obtain batch in form of shaped pallets with various size in limits of crucible diameter.

EFFECT: batch for high quality single crystal growth.

1 tbl, 1 ex

The invention relates to the field of synthesis of superhard materials, in particular the production of material at the base of diamond used for production machining tool

FIELD: process engineering.

SUBSTANCE: invention relates to production of articles from composites with metallic and carbine-metallic matrices and from cermets. Proposed method comprises making the blank of porous heat-resistant material and its 3D metalising at isothermal heater by placing the blank and crucible with metal in retort closed volume, heating, holding in vacuum and cooling. Note here that retort volume is quasi-shaped and/or such volume is created by blank or inside it. Note also that a part of crucibles with metal along with rigging whereat they are arranged features weight larger than that metalised blank while cooling is performed in metal vapours.

EFFECT: higher degree and uniformity of metalising.

5 cl, 1 tbl

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