The method of obtaining products of superhard composite materials

 

(57) Abstract:

Usage: the invention relates to the field to get superhard materials at high pressure and temperature. The inventive method of obtaining products of superhard composite materials increases cutting ability. The proposed method consistently placed four layers: a layer of metal compositions, taken in the form of quasi-eutectic ternary alloy Ti-Al-Cu, put antiglycation heat treating, grinding, spheroidizing and ultrasonic machining; cutting layer made of a mixture of powders iodide titanium and powder of cubic boron nitride is subjected to ultrasound treatment and clad metals, and placed on the metal layer of the composition; a substrate layer made from a mixture of powders clad cubic boron nitride, iodide titanium alloy Ti-Al-Cu, come on cutting layer; a support layer, containing the powder of the alloy Ti-Al-Cu, or a mixture clad powder alloy Ti-Al-Cu alloy solder, is placed on the substrate, and the influence of pressure and temperature takes place simultaneously with stepwise increasing temperature and decreasing pressure when isotermic the

The invention relates to the production of superhard materials at high pressure and temperature and can find application in mechanical engineering in the manufacture of the blade of the cutting tool.

The prototype of the invention is a method of obtaining products of superhard composite materials by the author. mon. USSR N 1630238, CL 04 In 35/58, 1994, under which consistently place the substrate is pressed from a mixture of powders of intermetallic compounds of copper and titanium, diamond and cubic boron nitride; cutting the layer containing cubic boron nitride and diamond; a metal layer of a composition containing intermetallic compounds of copper and titanium and aluminum, or manganese; stragically layer containing intermetallic compounds of copper and titanium, cubic boron nitride and diamond. Articles of superhard composite materials by the author.mon. N 1630238 get three layer: the layer of the substrate, the cutting layer and stragically layer, that is, with variables physico-mechanical properties. However, the composites obtained in this way are under difficult cutting conditions, for example when roughing of hardened steels, high relative wear.

The objective of the invention is to increase the cutting ability.

< aluminum, copper, containing, by weight. titanium 45-75, aluminum 8-15, copper the rest, I give it antiglycation heat treating, grinding and spheroidizing to the size of the particles in the form of spheroids, spheres or globules 5-315 μm, ultrasonic processing with frequency 20000-40000 Hz, then pressed on the shape of the product, the cutting layer made of a mixture of powders iodide titanium with a particle size of 1-5 μm and powder of cubic boron nitride large fraction with a grain size of 10-60 μm and the fine fraction with a grain size of 1-5 μm with a ratio of grain size 1:(0,15-0,015) clad with metal, having a melting point not higher than 0.7 to 0.9 of the melting temperature of the metal composition, and before cladding powders of cubic boron nitride is subjected to ultrasonic treatment, the ratio of the components of the cutting layer, wt. the iodide titanium 0.5 to 5; clad cubic boron nitride with grain size of 1-5 μm 0.5 to 5; the grain size of 10-50 microns rest, after which the mixture of the cutting layer is placed on the metal layer of the composition; a substrate made of a mixture clad powder of cubic boron nitride with grain size 10-60 μm, powder iodide titanium with a particle size of 1-5 μm and powder quasi-eutectic ternary alloy titanium aluminum copper with the size of the I of the substrate, wt. the mixture clad powder of cubic boron nitride powder and iodide titanium 40-60; quasi-eutectic alloy titanium aluminum copper the rest, and placed on the chopping layer with constant or variable along the height of the layer of the substrate content of the quasi-eutectic ternary alloy titanium aluminum copper, with a variable content of the mixture of the substrate placed pseudoloma with increasing surface contact of the substrate with a cutting layer number of an alloy of titanium, aluminum, copper, on the substrate placing base layer containing a powder of an alloy of titanium, aluminum, copper or clad alloy solder powders of titanium alloy aluminum and copper alloy solder, the next time the volume ratio of the layers, metal composition and the cutting layer 19-80, the substrate layer 80-10, the reference layer is 1-10, and the influence of pressure and temperature takes place simultaneously with step-by-step increase of the temperature up to the temperature of bonding titanium oxygen to the melting point of the coating metal, and then to the melting temperature of the metal composition, and at isothermal exposure pressure is reduced to 1-10 kbar.

In the proposed method, the influence of high pressure and temperature on the initial charge of osushestvleniu in the form of tablets. The plate heater is placed forming conductive liner, made in the form of a cylinder with an inner bore corresponding to the forms of many-sided inserts for cutting tools. The initial charge according to the method of the invention is placed in a forming liner layers: the layer of the metal composition, the cutting layer, the substrate layer and the reference layer. On top of the filled molding the liner placed second top plate of the heater. Filled catlinite container placed in the office of the high pressure and temperature and is exposed to high pressures and temperatures.

The metal composition is made from quasi-eutectic ternary alloy titanium aluminum copper. When used as a material impregnation dual alloy titanium copper composites sometimes have cracks, microcracks and other defects that, apparently, is explained by the stress concentration due to the presence of inclusions of copper in the composite structure. While triple qualifactions alloy titanium aluminum copper wets well the grain cubic nerida boron, forming a strong chemical bond and eliminating the localization of copper in a separate inclusions, prevents, the AU. titanium 45-75; aluminum 8-15; copper the rest.

Practically found that the presence of titanium in the alloy is more than 75 wt. and aluminum is more than 15 wt. leads to embrittlement of the material, and the decrease in titanium content less than 45 wt. and aluminum is less than 8 wt. reduces cutting properties of the composites when machining hardened steels. Material impregnation of metal composition in the form of quasi-eutectic ternary alloy of titanium, aluminum, copper, provides the necessary depth of impregnation, a strong bond grains of cubic boron nitride and a sufficient viscosity of the binder in the composite. The uniformity and quality of the material impregnation determining the homogeneity and properties of the working surface of the composite and, therefore, eventually a stable resistance of the cutters depend greatly on the method of preparation of metal composition. It is necessary to be guided not only by the degree of homogeneity of the alloy, not only the degree of grinding, but mainly by the degree of attainable homogeneity of the alloy particles, their shape, the optimum dispersion of the particles and their quality. Therefore, quasi-eutectic ternary alloy is subjected antiglycation heat treatment to achieve a high degree of uniformity SPLM. This form of particles of the alloy provides a minimum specific surface area and more technological. Obtain alloy particles with size less than 5 μm is not economically feasible, and more than 315 μm does not provide a compact arrangement, which may further result in the pressure drop in the chamber (apparatus) of high pressure. Received spheroidizing powder is subjected to ultrasonic treatment, which not only cleans the surface, but also activates it. It is found experimentally that the best effect is achieved at a frequency of from 20000 to 40000 Hz. Prepared spheroidizing powder quasi-eutectic ternary alloy titanium aluminum copper pressed on the shape of the product and have in shaping the liner in contact with the plate heater.

The cutting layer made of a mixture of powders iodide titanium powders and cubic boron nitride are two factions, clad metal, having a melting point not higher than 0.7 to 0.9 of the melting temperature of the metal composition. Grains of cubic boron nitride have cracks, dislocation violations and other surface defects, which are stress concentrators. Cladding grains of cubic boron nitride of the metal, iluvm, aluminum, silver, copper, significantly strengthens the grain and prevents sticking between the grains of cubic boron nitride, which facilitates the possibility of rearrangement and migration of the grains of cubic boron nitride with the appearance of the liquid phase in the direction of their more dense packing. The cladding metal with a melting point not use 0.7 to 0.9 of the melting temperature of the metal composition allows you to start the process of rearrangement and migration of the grains of cubic boron nitride to melting metal composition and impregnation its cutting layer. Ultrasonic treatment of grains of cubic boron nitride before cladding provides a strong adhesion the adhesion of metal films with grain surface. In addition, the cladding improves the wetting of the powder, facilitates impregnation, allowing you to increase the height of the resulting composites, and leads to more uniform distribution of material spanning the height of the composite. Cutting layer according to the method of the invention using a mixture of coated powders of cubic boron nitride coarse and fine fractions with particle sizes, respectively, and 10-60 1-5 μm. When using cubic boron nitride with grain size of more than 60 and less than 10 μm, the cutting properties com what contributes to the dispersion hardening of the binder in the finished composite, moreover, experimentally determined that the ratio of the grain size of the coarse and fine fractions 1:(0,15-0,015) is optimal and provides the maximum effect of dispersion hardening. Deviations from the selected ratios downward or upward lead either to a loosening of the structure or to increase the volume of backfill. The above-mentioned clad powders of cubic boron nitride is mixed with powder iodide titanium ratio, wt. powder iodide titanium 0.5 to 5; clad powders of cubic boron nitride with grain size of 1-5 μm 0.5 to 5; the grain size of 10-60 μm else.

Thorough mixing of powders ensures uniform distribution of iodide titanium and fine fractions of cubic boron nitride in the mixture of the cutting layer. Powder iodide titanium, having a great affinity for oxygen, binds oxygen when heated, forming a fine refractory oxides, which, being uniformly distributed in the cutting layer provide additional dispersion-strengthening effect. The presence of a mixture of the cutting layer is less than 0.5. iodide titanium and 0.5. fine cubic boron nitride has no significant positive impact, more than 5 kompositov. A mixture of powders of the cutting layer is placed in a forming the liner layer, the metal composition.

To achieve the greatest degree of consolidation of the composite layers to produce a single indissoluble connection of the cutting layer and the substrate, preventing the formation of cracks by eliminating stresses in the volume of the composite and the integrity of the composite material, the substrate is made from a mixture clad powder of cubic boron nitride with a particle size of 10-60 μm, iodide titanium with a particle size of 1-5 μm and quasi-eutectic ternary alloy titanium aluminum copper in the following ratio, wt. the mixture clad powder of cubic boron nitride powder and iodide titanium 40-60; quasi-eutectic alloy else, and the particle size of the titanium alloy, aluminum, copper 2-30 times the size of grains of cubic boron nitride. The substrate material should have a sufficiently high thermal conductivity to ensure good heat from the cutting edge of the composite. When insufficient heat at the cutting edge is formed a groove, which in the further processing leads to the destruction of material to chip the top of the cutter. In this way to increase thermal conductivity of the plate com is umini copper take 2-30 times the particle size of the cubic boron nitride. Beyond the specified ratio degrades the quality of the composite. It is found experimentally that the optimum content of the quasi-eutectic ternary alloy titanium aluminum copper is 40-60 wt. The content of the alloy Ti-Al-Cu layer of the substrate is less than 40 wt. impractical due to the reduction of thermal conductivity, more than 60 wt. leads to a decrease of the mechanical properties of the composite, for example, reduction of fatigue strength.

The substrate according to the invention is made of two types depending on the field of application of the finished plates: with a constant height of the layer of the substrate content of components and variables. The constant height of the layer of the substrate, the content of components useful for the manufacture of plates of superhard composite material used in the instrument with mechanical fastening tools. AC component content in the layer height of the substrate should be used for the manufacture of plates that you solder to the holder. The mixture of the substrate is pressed on the shape of the product and place on a cutting layer in forming the liner. Pre-forming layer of the substrate provides the greatest packing density and, consequently, the possibility polucheniya support layer, containing alloy of titanium, aluminium - copper or clad alloy solder powders of titanium alloy aluminum and copper alloy solder. Support layer, a soft, relatively more rigid substrate provides good contact with the holder when the mechanical mounting of the cutters and high-quality welded plate to the holder. The use of the reference layer of the titanium alloy aluminum copper allows you to save consolidation layers.

The initial charge of composite material is placed layers when the next volume ratio, metal composition and the cutting layer 19-80; the substrate layer 80-10; support layer 1-10.

The volume ratio is chosen empirically and depends on the scope of the plates of the superhard composite material. Thus, in the processing of highly tempered steel with high cutting speeds and small depth of cut, it is advisable to use a plate with a thin cutting layer and high substrate (up to 19% and 80%, respectively), which allows due to the good thermal conductivity of the substrate to increase the service life of the plate. Under severe cutting conditions, for example when machining steel with a hardness of 40-50 R with great depth cutting height cutting layer should be greater, and the height is oiki more than 80% will create difficulties when cutting, and with the height of the cutting layer over 80% of the layer and the substrate is less than 10% will degrade the heat sink. Mechanical fastening plates can be used low reference layer, but the layer height of less than 1% will create technological difficulties of its implementation. When the welded plates to the holder it is possible to use relatively high support layer, however, with the increasing height of the layer is more than 10% loss of strength of the composite.

The effect of pressure and temperature on the preparation of the initial charge takes place simultaneously with step-by-step increase of the temperature up to the temperature of bonding titanium oxygen, provide dispersion strengthening oxides, up to the melting temperature of the metal coating, which ensures the sealing of the powder of cubic boron nitride by regrouping and accordingly, increases the density of the composites and then to the melting temperature of the metal composition. The pressure decrease during isothermal holding at the melting point metal composition reduces the internal stresses in the composite material, resulting in the formation of composites without microcracks, i.e. increases the strength properties of the composites. The pressure decrease in the composites.

The composites according to the method receives three-layered: the cutting layer, the substrate layer and the reference layer.

The method according to the invention allows high properties of superhard powder of cubic boron nitride due to the complex take advantage of cladding, antiglycation heat treating, spheroidizing, ultrasonic machining, precision metal compositions compositions of the cutting layer, a substrate, a base layer, which is especially important for materials instrumental purposes.

The proposed method is illustrated by the following examples.

Example 1. In catlinite container lentils the high-pressure chamber in the cylindrical hole, which is a reaction volume, put the first bottom plate heater, made in the form of tablets of a diameter equal to the diameter of the hole in the lentils. The heater is made of a mixture of graphite with callinicum in the ratio of 1:1, which provides a high temperature in contact with the carbide high-pressure chamber, where the maximum heat sink. The plate heater in the lentils the high-pressure chamber is placed a conductive molding the liner of graphite, the instrument. The inner part of the formative liner is a working volume. Prepare the metal binder composition of the quasi-eutectic ternary alloy titanium aluminum copper, taken in the ratio, by weight. Ti 45; Al 8; Cu 47; punish him antiglycation heat treating, grinding and spheroidizing to the size of the particles in the form of spheroids, spheres or globules 315 μm, then the ultrasonic processing with a frequency of 20000 Hz, and then pressed to form the inner bore forming the liner. Pressed metal composition have on shaping the liner in contact with the plate heater. The cutting layer made of a mixture of powders iodide titanium with a particle size of 5 μm and powder of cubic boron nitride large fraction with a grain size of 60 μm and the fine fraction with a grain size of 1 and 5 μm with a ratio of grain size 1: 0,017 1: 0,083 respectively, clad with zinc or tin, having a melting point of 419 and 232oWith, and before cladding powders of cubic boron nitride is subjected to ultrasonic treatment with a frequency of 20000 Hz. Components of the cutting layer take in the ratio, by weight. the iodide titanium 0,5; clad cubic boron nitride with grain size of 1 μm and 5 m is in forming the liner layer, the metal composition.

The substrate is made from a mixture clad in zinc or tin powder of cubic boron nitride with grain size of 60 μm, powder iodide titanium with a particle size of 5 μm and powder quasi-eutectic ternary alloy of titanium, aluminum, copper with particle size of 1.8 mm, that is 30 times the size of the grains of cubic boron nitride. Components layer substrate take the ratio of the mixture clad powder of cubic boron nitride powder and iodide titanium 40 wt. the quasi-eutectic alloy titanium aluminum copper 60 wt. pressed and fitted in forming the liner on the cutting layer.

The substrate is made depending on the field of application of the finished plates of two types: with a constant height of the layer of the substrate content of components and variables. When the AC component of the mixture of the substrate placed pseudoloma with increasing surface contact of the substrate with a cutting layer number alloy titanium aluminum copper.

Support layer is prepared from a mixture of powder of the alloy Ti-Al-Cu pre-clad alloy solder powder and the alloy solder, pressed and placed in forming the liner on the substrate layer.

Layers stack at kaduru for forming a liner in contact with the support layer have a second top plate of the heater, made also in the form of tablets with a diameter equal to the outside diameter of the forming of the liner.

Filled with lentils placed in the office of the high pressure and temperature and is subjected to the simultaneous action of pressure and temperature. The temperature was raised stepwise, first to the melting point of zinc (419oC) or tin (232oC), then to the temperature of bonding titanium oxygen 530-550oWith, then to the melting temperature of the metal composition of the order of 1100oC. Under pressure of 30 kbar and temperatures of the order of 1100oWith isothermal aging 25 to reduce the pressure of 10 kbar. After reducing the pressure to atmospheric, and the temperature to room receive a composite plate. Plate cutters of these composites in different shapes (square, round, rhombic, triangular) for roughing hardened steel jug with hardness R 60 show the relative wear of hC/l 0,008.

Example 2. In catlinite container lentils the high-pressure chamber in the cylindrical hole is placed first bottom plate heater, made in the form of tablets. The plate heater is placed a conductive molding the liner from gr the cutting tool. The inner part of the formative liner is a working volume. Prepare the metal binder composition of the quasi-eutectic ternary alloy titanium aluminum copper, taken in the ratio, by weight. Ti 60; Al 12; Cu 28, punish him antiglycation heat treating, grinding and spheroidizing to the size of the particles in the form of spheroids, spheres or globules of 150 μm, then the ultrasonic processing with a frequency of 30,000 Hz, and then pressed to form the inner bore forming the liner. Pressed metal composition is placed in molding the liner in contact with the plate heater.

The cutting layer made of a mixture of powders iodide titanium with a particle size of 2 μm and powder of cubic boron nitride large fraction with a grain size of 28 and 10 μm and the fine fraction with a grain size of 1 μm with a ratio of grain size 1:being 0.036 and 1:0.1, respectively, clad with aluminum, having a melting point of 660oWith, and before cladding powders of cubic boron nitride is subjected to ultrasonic treatment with a frequency of 30,000 Hz. Components of the cutting layer take in the ratio, by weight. the iodide titanium 3; clad aluminum cubic boron nitride grit 1 my place in forming the liner layer, the metal composition. The substrate is made from a mixture clad aluminum powder of cubic boron nitride with grain size of 28 μm, powder iodide titanium with a particle size of 2 μm and powder quasi-eutectic ternary alloy titanium aluminum copper with particle size of 315 μm, that is 11 times the size of the grains of cubic boron nitride. The layer components of the substrate taken in the ratio of 50 wt. the mixture clad aluminum powder of cubic boron nitride powder and iodide titanium and 50 wt. the quasi-eutectic alloy titanium aluminum copper, and have in forming the liner on the cutting layer. The substrate depending on the scope of the composites can be produced in two forms: with a constant or variable component content in the layer height of the substrate.

Support layer is prepared from a mixture of powders of the alloy Ti-Ad-Cu pre-clad alloy solder, pressed and placed in forming the liner on the substrate layer. The above layers are placed in a forming insert the next volume ratio of metal composition and the cutting layer is 50% of the substrate layer of 45% support layer 5%

On top forming the liner in contact with the support layer have a second top the existing liner.

Filled chachevichy placed in the office of the high pressure and temperature and is subjected to the simultaneous action of pressure and temperature. The temperature was raised stepwise, first to a temperature of linking titanium oxygen 530-550oWith, then to the melting point of aluminum is 660oWith, then to the melting temperature of the metal composition of about 1200oC. Under pressure of 30 kbar and a temperature of about 1200oWith isothermal aging 20 to reduce the pressure of 5 kbar. After reducing the pressure to atmospheric, and the temperature to room receive a composite plate. Plate cutters of these composites in different shapes: square, round, rhombic, triangular when roughing hardened steel jug with hardness R 60 show the relative wear of hC/L 0,005.

Example 3. In catlinite container lentils the high-pressure chamber in the cylindrical hole is placed first bottom plate heater, made in the form of tablets. The plate heater is placed forming conductive liner of graphite, made in the form of a cylinder with an inner bore corresponding to the forms of many-sided inserts for cutting tools. what the binder composition of the quasi-eutectic ternary alloy titanium aluminum copper, taken in the ratio, by weight. Ti 75; Al 15; C 10, I give it antiglycation heat treating, grinding and spheroidizing to the size of the particles in the form of spheroids, spheres or globules 5 μm, then the ultrasound treatment with a frequency of 40,000 Hz, and then pressed to form the inner bore forming of the liner, i.e. the shape of the product. Pressed metal composition is placed in molding the liner in contact with the plate heater. The cutting layer made of a mixture of powders iodide titanium with a particle size of 1 μm and powder of cubic boron nitride large fraction with a grain size of 20 μm and the fine fraction with a grain size of 3 and 1 μm with a ratio of grain size to 1:0.15 and 1:0,05, respectively, clad with silver (TPL961oC) or copper (TPL1083oC), and before cladding powders of cubic boron nitride is subjected to ultrasonic treatment with a frequency of 40,000 Hz. Components of the cutting layer take in the ratio, by weight. the iodide titanium 5; clad cubic boron nitride with grain size of 3 μm and 1 μm 5; clad cubic boron nitride with grain size of 20 μm 90. The mixture of the cutting layer is placed in a forming the liner layer, the metal composition.

P the aqueous titanium with a particle size of 1 μm and powder quasi-eutectic ternary alloy titanium aluminum copper with particle size of 20 μm, that is 2 times the size of the grains of cubic boron nitride. The layer components of the substrate taken in the ratio of 60 wt. the mixture clad powder of cubic boron nitride and 40 wt. the quasi-eutectic alloy titanium aluminum copper and have in forming the liner on the supporting layer is prepared from a powder of an alloy of titanium, aluminum, copper, pressed and placed in forming the liner on the substrate layer.

The above layers are placed in a forming insert the next volume ratio: 19% metal composition and the cutting layer, 80% of the substrate layer, 1% of the reference layer.

On top forming the liner in contact with the support layer have a second top plate of the heater, made in the form of tablets with a diameter equal to the outside diameter of the forming of the liner.

Filled with lentils placed in the office of the high pressure and temperature and is subjected to the simultaneous action of pressure and temperature. The temperature was raised stepwise, first to a temperature of linking titanium oxygen 530-550oFrom then until the melting point of 961oWith or Cu 1088oWith, then to the melting temperature of the metal composition of the order of 1250oC/l 0,005-0,006.

The method allows to obtain composites, cutting inserts of which show a small relative wear under complex flow conditions. When roughing hardened steel jug hardness LDCs 60 plates of composites obtained by the method of the prototype show the relative wear of hC/L0,01, while the cutting blades of the composites obtained by the proposed method shows the relative wear of hC/L to 0.005. A significant decrease in the relative wear allows the use of composites obtained by the proposed method in the manufacture of the blade of the cutting tool for processing as hardened structural and alloyed steels, and in the state of delivery. Plate cutters of superhard composite materials can be used on CNC machines for automatic production.

The method of obtaining products of superhard composite materials by sequential layer is RA, substrates containing copper, titanium and cubic boron nitride, followed by high pressure and temperature, wherein the metal composition is taken in the form of quasi-eutectic ternary alloy titanium aluminum copper containing, by weight.

Titanium 45 75

Aluminum 8 15

Copper the Rest

punish him antiglycation heat treating, grinding and spheroidizing to the size of the particles in the form of spheroids, spheres or globules 5 315 μm, ultrasonic processing with a frequency of 20000 40000 Hz, then pressed on the shape of the product, the cutting layer made of a mixture of powders iodide titanium with a particle size of 1 to 5 μm and powder of cubic boron nitride large fraction with a grain size of 10 to 60 μm and the fine fraction with a grain size of 1 to 5 μm with a ratio of grain size 1 0,15 0,015 clad with a metal having a melting point not higher than 0.7 to 0.9 of the melting temperature of the metal composition, and before cladding powders of cubic boron nitride is subjected to ultrasonic treatment in a ratio of components of the cutting layer, wt.

The iodide titanium 0,5 5,0

Clad cubic boron nitride grit

1 5 µm 0,5 5,0

10 to 60 μm Else

after which the mixture is cutting the cubic boron nitride with grain size of 10 to 60 μm, powder iodide titanium with a particle size of 1 to 5 μm and powder quasi-eutectic ternary alloy of titanium, aluminum, copper with particle size of 2 to 30 times the size of the grains of cubic boron nitride, in the following ratio of components layer substrate, wt.

The mixture clad powder of cubic boron nitride powder and iodide titanium 40 60

The quasi-eutectic alloy titanium aluminum copper the Rest

and have on the cutting layer with constant or variable along the height of the layer of the substrate by soderzhanie quasi-eutectic ternary alloy of titanium, aluminium - copper, with a variable content of the mixture of the substrate placed pseudoloma with increasing surface contact of the substrate with a cutting layer number alloy titanium aluminum copper, on the substrate placing base layer containing a powder of an alloy of titanium, aluminum, copper or clad alloy solder powders of titanium alloy aluminum and copper alloy solder the next time the volume ratio of layers

Metal composition and the cutting layer 19 80

The substrate layer 80 10

Support layer 1 10

and the influence of pressure and temperature takes place simultaneously with step-by-step increase of the temperature to a temperature of linking the composition, moreover, isothermal exposure pressure is reduced by 1 to 10 kbar.

 

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2 cl, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to silicon carbide-based structural materials used in oil production and processing industries (end seals, oil pumps, downhole pumps, bearings, etc). Proposed process comprises forming of the billet based on fine filler as the powder of cubic boron nitride or boron carbide and temporary binder. Formed billet is annealed at final temperature corresponding to that of complete removal of volatile products from temporary binder, and siliconizing. This compound uses the mix of said powders with carbon of silicon-active variety with particle size of not over 20 mcm (ash or colloidal graphite) as aforesaid fine filler. Siliconizing after annealing is performed by vapour-liquid-phase process at capillary condensation of silicon vapours at billet heating to 1300-1500°C. Cubic boron nitride or boron carbide and carbon in the mix are taken in the amount of 70-80 and 20-30 wt %.

EFFECT: higher hardness and strength of composite.

2 cl, 1 tbl

FIELD: ceramic industry.

SUBSTANCE: invention relates to engineering ceramics, particularly, to a wear resistant composite nanostructurized material based on cubic Boron Nitride (cBN) containing phase silicon nitride (Si3N4) and aluminium oxide (Al2O3) intended for use in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material. Disclosed is a wear-resistant composite nanostructurized material based on cubic boron nitride with matrix of Silicon (Si3N4) and aluminium oxide (Al2O3), containing component in the form of nano-sized phase of aluminium nitride (AIN), hardening matrix and the boundary between grains of boron nitride and matrix at volume ratio of components: cBN-49-52 %; matrix phase-42-45 %; nanosize phase AIN-4-6 %. Said material may have a coating composition AlXTi(1-X)N, where x = 0.55÷0.65 applied by physical vapour deposition. For creation of material with specified characteristics of the proposed method comprises mixing initial cubic Boron Nitride, aluminium oxide, Silicon nitride and sintering the obtained mixture under high pressure and high temperature (HPHT), wherein the process of sintering material is carried out at 1,450-1,550 °C and pressure in the range 3.5-3.9 GPa during 20 c. for production of microstructure consisting of a nanosized phase of aluminium nitride , sintering process is carried out in the presence of aluminium in gas phase.

EFFECT: is used in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material.

5 cl, 1 tbl, 2 dwg, 11 ex

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