Diamond sintered material, the production method and the tool and the abrasive powder from it

 

(57) Abstract:

Diamond sintered material having excellent fracture resistance, corrosion resistance, heat resistance and wear resistance, and is capable of specalist at relatively low pressure and low temperature contains 50-99,0% vol. diamond and the rest of the binder phase consisting of a single or mixed phase of compounds or mixtures of at least one element selected from the group consisting of rare earth elements of groups IIIB, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, with a phosphorus compound or the above compounds or a mixture of oxide of the element. Method of production of the material consists of mixing diamond powder or graphite powder binder, curing and sintering a mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond. Diamond sintered material according to the invention can be used for manufacturing and tool and abrasive powder. 11 s and 21 C.p. f-crystals, 4 PL.

The invention relates to a diamond sintered material, method of its production and cutting and drilling is preferably used as a material for tools for cutting or polishing of non-ferrous metals or ceramics, for blades drill bits for oil or abrasive powders obtained by grinding of the material.

Known sintered materials based on synthetic diamonds can be classified into three types depending on cementing materials:

1) obtained by using metals of the iron group (Fe, Ni, Co) and/or their alloys, each of which has a solvent action as a cementitious binder;

2) obtained by using silicon carbide (SiC) as the cementitious binder;

3) obtained by using carbonate having a catalytic action as a cementing ligament (Japanese patent laying N 74766/1992 and 114966/1992).

Material type 3 requires sintering at a higher temperature and pressure than the materials of types 1 and 2, resulting in significantly increased production costs, therefore, commercially available materials are nearly all materials types 1 and 2, which are metals of the iron group or their alloys and silicon carbide.

In addition to the above materials are sintered materials based on natural diamonds (black carbon), which is almost Nicene minor production.

With the above known sintered materials based on synthetic diamonds have the following problems:

a) in the case of sintered materials of type 1, obtained by using metals of the iron group and/or their alloys, diamond reacts with the material of the ligament with a decrease in strength when the temperature rises to 700oC or higher and the durability or strength is reduced due to the use of metal as a cementitious binder;

b) in the case of sintered materials of type 2 obtained by using silicon carbide as a cementing ligament, fracture resistance is poor due to the use of brittle carbide as the material ligaments and adhesion of diamond grains with each other is reduced, so that the wear resistance is poor due to the use of silicon carbide with no solvent and catalytic action on the diamond;

in case of a sintered material of type 3, obtained by using carbonate as cementitious material bundles, pressure and temperature at which the carbonate has a catalytic action are high, and sintered much smaller compared to the above-described sintered Malaspina at ultrahigh pressures and the strength of adhesion of the diamond grains among themselves so weak, that fracture resistance is bad, because the carbonate has a relatively small catalytic and solvent action;

g) in the case of immersing the above-described sintered material type 1 in acid to remove metals of the iron group or their alloys as strength and fracture resistance are poor, and its use is limited to use at a high temperature.

As described above, the renowned diamond sintered materials suffer from at least two of the following disadvantages: 1) poor heat resistance, 2) poor fracture resistance, 3) poor wear resistance, 4) the need for high temperature and pressure for sintering with stemming from higher costs.

Diamond sintered material, which uses a metal of the iron group, such as Co, acting as a catalyst capable of accelerating graphitization diamond, has poor heat resistance. Namely, the diamond graffitied with almost 700oC in an atmosphere of inert gas. In addition, this sintered material has such a high strength and tends to deteriorate due to the presence of metal, such as Co, at the boundaries between the institutions destruction due to differences in thermal expansion between the metal and the diamond.

To improve the heat resistance was offered by treatment with acid to remove the metal on the above boundaries between the grains. Thus, the temperature of the heat rose to almost 1200oC, but the strength was much reduced by almost 30% as the sintered material was porous.

Diamond sintered material in which the material of the cords used SiC, has excellent heat resistance, but shows low strength due to the lack of adhesion of the diamond grains to each other.

On the other hand, the diamond sintered material, in which the ligament is used carbonate, has excellent heat resistance and relatively high strength, but for its production requires higher pressure and temperature, for example at least of 7.7 GPA and 2000oC, so that it is difficult to produce on an industrial scale, so it has not found practical application. Because carbonates have low catalytic ability and less solvent and precipitating action on the diamond in comparison with metals of the iron group, used in the known technique, the adhesion of the diamond grains between them is nedostataka diamond sintered material, having an excellent heat resistance, fracture resistance and wear resistance, which can be synthesized at relatively low pressure and temperature, and thus to be solved the above described problems of the known technique.

Another aim of the invention is to provide a method for manufacturing a diamond sintered material having excellent heat resistance, fracture resistance and wear resistance.

An additional objective of the invention is to provide a tool for cutting, polishing or drilling using a diamond sintered material.

Another aim of the invention is to provide abrasive powder obtained by grinding the diamond sintered material.

These objectives can be achieved by means of a diamond sintered material containing 50-99,9% vol. diamond and the rest of the binder phase consisting of a single or mixed phase of the connection (S) or mixture (C') at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, with FOS who made many efforts to solve the problems of the known technology and to develop the diamond sintered material, possessing excellent heat resistance, resistance to fracture and wear resistance, which can be synthesized at relatively low pressure and temperature, and the result achieved by the following inventions and ways of their implementation:

1. Diamond sintered material containing 50-99,9 vol.%, preferably 50-99,5 vol.%, more preferably 70-99, vol.% diamond and the rest of the binder phase consisting of a single or mixed phase of the connection (S) or mixture (C') at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI. The periodic table of elements, the group of iron, Mn, V, alkali metals and alkaline earth metals, with a phosphorus compound (C) or of the above compound (S) or mixture (C') with the oxide of the element (A).

2. Diamond sintered material containing 50-99,9 vol.%, preferably 60-99,5 vol. %, more preferably 70-99% vol. the diamond and the rest of the bunch, mainly consisting of material obtained from rare earth element and phosphorus compounds.

3. Method of manufacturing a diamond sintered material described in paragraphs 1 or 2, which consists in mixing p is now groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, powder, at least one oxide of element (A) or at least one compound (D) containing the element (a), phosphorus powder or at least one phosphorus compounds (b) and diamond powder or graphite, maintaining and sintering the resulting mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond.

4. Method of manufacturing a diamond sintered material described in paragraphs 1 or 2, which is in the preliminary synthesis of the compound (C) at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals with at least one phosphorus compound (B) or a mixture of compounds (C) and at least one oxide of element (A), mixing powder of the compound (C) or mixed with diamond powder or graphite, maintaining and sintering the resulting mixture of powders under pressure and at a temperature in termodinamicheskogo paragraphs 1 or 2, which is the preliminary preparation of a thin piece of thin sheet or substrate of sintered material consisting of compounds (C) at least one element (A) selected from the group consisting of rare earth elements, elements of group IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, v, alkali metals and alkaline earth metals with at least one phosphorus compound (B) or a mixture of compounds (C) and at least one oxide of element (A), the Association of diamond powder or graphite with a thin crust, a thin sheet or substrate of sintered material and the impregnation of the resulting preform under pressure and at a temperature in thermodynamically stable region of diamond, thereby cement the diamond.

6) the Method of manufacturing a diamond sintered material described in paragraphs 1 or 2, which consists of mixing the powder of rare earth element or alloy powder containing at least one rare earth element, phosphorus compounds and diamond powder or non-diamond carbon powder or a mixture of diamond to non-diamond carbon powder, and maintaining and sintering the resulting and diamond.

7. Method of manufacturing a diamond sintered material described in paragraphs 1 or 2, which is in the preliminary synthesis of compounds of the rare earth element and phosphorus compounds, the mixing of the powder, the resulting compound with diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder, and maintaining and sintering the resulting mixture of raw materials under pressure and at a temperature in thermodynamically stable region of diamond.

8. Method of manufacturing a diamond sintered material described in paragraphs 1 or 2, which is the layering of the molded material from a powder of rare earth element or alloy powder containing at least one rare earth element, and powder phosphorus compounds and molded material from the diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder, and maintaining and sintering the resulting layered material under pressure and at a temperature in thermodynamically stable region of diamond.

9. Method of manufacturing Almaznogo compounds of the rare earth element and phosphorus compounds, the layering of the molded material from the resulting powder compounds and molded material from the diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder, and maintaining and sintering the resulting layered material under pressure and at a temperature in thermodynamically stable region of diamond.

10. Diamond sintered material described in the above item 1, in which the phosphorus compound (B) expressed by the formula PaObwhere "a" is 1 or 2 and "b" is 2, 3, 4, 5, and 7.

11. Diamond sintered material described in the above item 1 in which the compound (S) or mixture (C') is expressed by the formula MNx(PaOb)y(OH)zwhere M is a simple substance or solid solution of at least one element selected from the group consisting of rare earth elements, alkaline earth elements and group elements IV of the Periodic table of elements, and N is a simple substance or solid solution of at least one element selected from the group consisting of elements of group IIIB of the Periodic table of elements, and sulfur, and "x", "y" and "z" respectively, are located at intervals of 1 x 4.5, 1 y ASCA consists of compounds (C) or mixture (C'at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, with a phosphorus compound (B) expressed as PaObwhere "a" is 1 or 2 and "b" is 2, 3, 4, 5, or 7, and nitric oxide, at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals.

13. Diamond sintered material described in paragraphs 1, 2, 10, or 11, in which the ligament consists of connection (S) or mixture (WITH') expressed by the formula MNx(PaOb)y(OH)zwhere M is a simple substance or solid solution of at least one element selected from the group consisting of rare earth elements, alkaline earth elements group IV of the Periodic table of elements, and N is a simple substance or solid solution of at least one element selected from the group consisting of elements of group IIIB of the Periodic table of elements, and sulfur, and "x", "y" ippy, consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals.

14. Diamond sintered material containing 50-99,9 vol.%, preferably 50-99,5 vol.%, more preferably 70-99% vol. diamond and the rest of lubricant, mainly containing material derived from phosphorus compounds and carbonate compounds.

15. Diamond sintered material described in the above item 14, in which the ligament consists of a mixed phase consisting of material obtained from phosphorus compounds, carbonate compounds and nitric oxide.

16. Diamond sintered material described in paragraphs 14 and 15, in which the ligament consists of a mixed phase consisting of phosphate-carbonate compounds or phosphoric oxide-carbonate compounds derived from phosphorus compounds, carbonate compounds and nitric oxide.

17. Diamond sintered material described in any of paragraphs 14-16, in which the phosphorus compound contains at least one of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIB, Izlozhennikh paragraphs 14-16, in which the carbonate compound contains at least one of rare earth elements, alkali metals, alkaline earth metals, Mn and V

19. Diamond sintered material described in any of the above paragraphs 14 or 15, in which the material obtained from phosphorus compounds and carbonate compounds contains at least one of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIB, IV and VI of the Periodic table of elements.

20. Diamond sintered material described in any of the above paragraphs 15 or 16, in which the oxide contains at least one of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIB, IV, VI and IV of the Periodic table of elements, metals of the iron group, Mn and V

21. Diamond sintered material described in any of the above paragraphs 14, 15, 16 or 19, in which the material obtained from phosphorus compounds, carbonate compounds, Apatite is expressed by the formula Mx[NyCO3(PaOb)z] , where M is a single element or solid solution of at least one element selected from the group consisting of ed is NT or oxide, selected from the group consisting of rare earth elements, elements of group IIIB, IV and VI of the Periodic table of elements and oxides of elements of groups IV or oxides of metals, and "x", "y" and "z" respectively in the intervals 1 x 7, 1 y 6 1 z 6, "a" is 1 or 2 and "b" is 2, 3, 4, 5, or 7.

22. Method of manufacturing a diamond sintered material described in any of the above items 14-21, which consists in mixing at least one component selected from the group consisting of powders of phosphorus compounds, powders, carbonate compounds, powders of phosphorus and carbonate compounds and powders of oxide of phosphorus and carbonate compounds, at least one oxide and diamond powder, and sintering the resulting mixture of powders as raw powdery material under pressure and at a temperature in thermodynamically stable region of diamond.

23. Method of manufacturing a diamond sintered material described in any of the above items 14-21, which is in the preliminary connection is obtained a mixture consisting of at least one component selected from the group consisting of phosphorus compounds, carbonate compounds, powder, turning it into a powder, mixing the resulting powder and diamond powder and sintering the resulting mixture of powders as raw powdery material under pressure and at a temperature in thermodynamically stable region of diamond.

24. Method of manufacturing a diamond sintered material described in any of the above items 14-21, which consists in mixing at least one component selected from the group consisting of powders of phosphorus compounds, powders, carbonate compounds, powders of phosphorus and carbonate compounds and powders of oxide of phosphorus and carbonate compounds, and at least one oxide powder to obtain a mixture of powders or in the preliminary connection or a mixture of at least one component selected from the group consisting of phosphorus compounds, carbonate compounds, phosphate-carbonate compounds and phosphoric oxide-carbonate compounds and at least one oxide, turning it into powder, the preparation of a thin piece of thin sheet or substrate the sintered material of a mixture of powders or powder, the Federation of diamond or graphicaltheme workpiece under pressure and at a temperature in thermodynamically stable region of diamond, thus cement diamond.

25. Diamond sintered material containing 0.1 to 30% vol. material consisting of a compound containing an element of group III of the Periodic table of elements and phosphorus, and the rest of the diamond.

26. Diamond sintered material described in the above paragraph 25, in which the compound containing an element of group III of the Periodic table of elements and phosphorus, is a compound, consisting of oxide of an element of group III of the Periodic table of elements and oxides of phosphorus.

27. Diamond sintered material described in the above paragraph 25, in which the compound containing an element of group III of the Periodic table of elements and phosphorus is phosphorus element of group III of the Periodic table of elements.

28. Diamond sintered material described in any of the above paragraphs 25 to 27, in which the elements of group III of the Periodic table of elements are B, Al and V

29. Method of manufacturing a diamond sintered material described in any of the above paragraphs 25-28, which is to use a phosphate of an element of group III of the Periodic table of elements in powder form and as a cementing substance, mixing prirodnogo powders, maintaining and sintering the resulting mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond.

30. Method of manufacturing a diamond sintered material described in any of the above paragraphs 25-28, which lies in the layering of the molded material from a powder of phosphate of an element of group III of the Periodic table of elements, used as a cementing substance, and a molded material from the diamond powder or non-diamond carbon powder or of a mixture of diamond and non-diamond carbon powder, and maintaining and sintering the resulting layered material under pressure and at a temperature in thermodynamically stable region of diamond.

31. Method of manufacturing a diamond sintered material described in paragraphs 29 or 30, wherein the phosphate is a phosphate hydrate, acid phosphate or hydrogen phosphate hydrate.

32. Method of manufacturing a diamond sintered material described in paragraphs 29 or 30, wherein the mixture of oxide of an element of group III of the Periodic table of elements and oxide phosphate is used as a cementing substance.

34. Method of manufacturing a diamond sintered material described in any of the above paragraphs 29-33, wherein the element of group III is a boron, aluminum or yttrium.

35. The tool of the diamond sintered material for cutting, polishing and drilling, characterized by using as the cutting edge of the diamond sintered material described in the preceding paragraphs, or the diamond sintered material obtained by the method described in the preceding paragraphs.

36. Abrasive powder obtained by grinding the diamond sintered material described in the preceding paragraphs, or the diamond sintered material obtained by the method described in the preceding paragraphs.

The invention is based on the discovery that phosphorus compounds, each of which contains at least one element (A) selected from the group consisting of elements of groups IIIA, IIIB, IV And IV and VI of the Periodic table of elements, elements of the iron group, Mn, V, alkali metals, rare earth elements and alkaline earth elements are very effective as a cementitious binder for the diamond sintered material.

In the above PU the solid solutions, multimodal or complex oxides, each of which contains other compounds in addition to the phosphoric compounds.

The preferred form of phosphorus compounds capable of providing a cementing action on the diamond, is expressed by the formula PaOband when "a" is 1 or 2 or "b" is 2, 3, 4, 5, or 7 in this formula, you can achieve the best results. Also found that the composition, strong as the material ligaments, expressed by the formula M Nx(PaOb)y(OH)zin which M is a simple substance or solid solution of at least one element selected from the group consisting of rare earth elements, alkaline earth elements and group elements IV of the Periodic table of elements, and N is a simple substance or solid solution of at least one element selected from the group consisting of elements of group IIIB of the Periodic table of elements, and sulfur, and "x", "y" and "z" respectively, are located at intervals of 1 x 4.5, 1 y 5 1 z 26; which is effective even in combination with various compounds or oxides.

In a preferred embodiment of the invention offer the diamond sintered material containing 50-99,9 vol.%, preparement and phosphorus compounds, is use of a mixture or compound, consisting of a rare earth element and phosphorus compounds.

Next is illustrated the effect of rare earth elements, phosphorus compounds and other substances according to the invention.

a) the Impact of adding rare earth elements.

Rare earth element acts as a solvent for dissolving carbon and accelerates the cementing of the diamond. However, when using rare earth elements as a single element or an alloy of rare earth metal and a metal of the iron group as cementitious material bundles they react with diamond to form carbides, which prevent the cementing of grains of diamond.

b) the Impact of adding phosphorus compounds.

On the other hand, the phosphorus compound has an effect on preventing carburization of rare earth elements in addition to its catalytic or solvent action in the synthesis of diamond and promotes the dissolving action of rare earth elements.

Therefore, it is assumed that the coexistence of rare earth element and phosphate in cementing the bond preferably is and phosphate dissolved in a stable region of the diamond and in the end almost goes into his compound at normal pressure.

Such a compound of rare earth element and phosphate strongly etched or corrode under the action of acid or alkali, and has the advantage that when it is used as ligaments do not require such high pressure and temperature, as in the case of carbonates. However, the carbon of the diamond partially reacts with this connection with the formation, in some cases, carbide, carbonate compounds or their mixtures, but this does not have any significant effects.

C) the Impact of adding the alkaline earth metals, elements of groups IIIB and IV of the Periodic table of elements and sulfur.

These elements thus have a low catalytic activity for the synthesis of diamond, but have an effect in reducing the melting temperature of communications and, thus, sintering of diamond at low pressure and low temperature. This means that there can be much reduced cost of production of the diamond sintered material with the resulting large economic benefits, making it at a relatively low pressure and low temperature.

g) the Advantage resulting from the use of phosphate compounds as vaskiluoto, and strength and does not affect the mapping. In particular, this advantage is more significant when drilling or cutting in a corrosive environment.

The phosphorus compound has a coefficient of thermal expansion 5 10-6that is closer to the coefficient of thermal expansion of diamond 2-3 10-6and therefore, there is no thermal stresses in the sintered material, even if it is used at high temperature, resulting in excellent heat resistance.

The second advantage is that the reduced melting point of the ligament, therefore, sintering is possible at low temperature. Similar advantages can be obtained in any case, i.e. the preparation of bundles of a single joint or many joints.

d) the Impact of phosphate compounds.

In General, oxides of phosphorus can be expressed by the formula PaOb. As was established, the number of phosphoric acids, in which "a" and "b" satisfy the following conditions, have a stabilizing effect and are used for cementing diamond, a = 1 or 2, b = 2, 3, 4, 5, or 7.

Next, it is established that in addition to orthophosphoric acid gipofosforna acid (H3PO2also it is the priori acid (HPO3). In addition, can be effectively used polyphosphoric acid, as, for example, pyrophosphoryl acid, trifosfornaya acid, trimetaphosphate acid, teratospermia acid, etc.

e) the Effect of compounds expressed by the formula MNx(PaOb)y(OH)z.

Connection MNx(PaOb)y(OH)zin which M is Ce and N is Al, known as CeAl3(PO4)2(OH)6(forensic). The first effect achieved thanks to the use of this compound for binding, is that this compound has a low melting point that the diamond can be cemented at a lower temperature to 300 to 400oC compared to carbonate catalyst in a known technique, and the pressure can be much reduced by 1 HPa (10000 ATM) or more. Production at such low pressure and temperature largely contributes to the reduction in the cost of manufacturing the sintered material and inexpensive product.

The above compound is resistant to acid and alkali resistant and has excellent corrosion resistance, so it is suitable for use as the cutting edge of the drill crowns when Dubysa simple substance or solid solution of at least one element, selected from the group consisting of rare earth elements and group elements IV of the Periodic table of elements, and N is a simple substance or solid solution of at least one element selected from the group consisting of elements of group IIIB (Al, B, Ga, In, Tl) of the Periodic table of elements, and sulfur, and "x", "y" and "z" respectively, are located at intervals of 1 x 4.5, 1 y 5 1 z 26.

When the connection is dispersed in the oxide, there may be effects similar to the above.

g) the Impact of adding carbonate.

The carbonate acts not only as a solvent for synthesis of diamond, but also as a reagent to reduce the melting temperature of the ligaments and temperature synthesis of diamond due to the coexistence with a phosphorus compound or the formation of compounds. In addition, the influence of carbonate is the reduction or containment of carburizing rare earth elements etc.

C) the Impact of adding compounds containing alkali metals, alkaline earth elements, elements of group IIIB, IV and VI of the Periodic table of elements.

The first effect is that the above compound has excellent chemical resistance and durability and not the Onna environment.

The phosphorus compound has a coefficient of thermal expansion 5 10-6that is closer to the coefficient of thermal expansion of diamond 2-3 10-6and therefore, there is no thermal stresses in the sintered material, even if it is used at high temperature, resulting in excellent heat resistance.

The second effect is that it decreases the melting point of the ligament and thus, it becomes possible sintering at a low temperature. Similar results can be obtained in any case, i.e. the preparation of bundles from a single connection or multiple connections.

and the Impact of adding oxides, in particular oxides of alkali metals, alkaline-earth elements, elements of groups IIIA, IIIB, IV and VI of the Periodic table of elements, metals of the iron group, group members IV of the Periodic table of elements, Mn and V

The impact of adding these oxides is to reduce the sintering temperature and to improve the corrosion resistance or strength of the ligament.

K) the Effect of presence in a bunch of Apatite, expressed by the formula Mx[NyCO3(PaOb)z].

The first effect, such a low melting point, the diamond can be cemented at a lower temperature of about 500-600oC compared to the use of carbonate catalyst in a known technique, and the pressure can be much reduced by 1.5 HPa (15000 ATM) or more. Production at such low pressure and temperature largely contributes to the reduction in the cost of manufacturing the sintered material to provide an inexpensive product.

The above compound is resistant to acids and alkalis and has excellent corrosion resistance, so it is suitable for use in the cutting edge of the drill crowns in oil production.

As has been established, the connection Mx[NyCO3(PaOb)z] is formed when M is a simple substance or solid solution of at least one element selected from the group consisting of rare earth elements, alkaline elements, alkaline earth elements, Pb, Mn and V, and N is a compound containing at least one element or oxide selected from the group consisting of rare earth elements, elements of group IIIB, IV, VI and IV of the Periodic table of elements, and oxides of these elements from the elements - metals, and 1 x 7, 1 y 6 1 z 6.

Next hetenyi at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, primarily from rare earth elements, which include the lanthanides, such as, for example, La, Ce, Pz, Nd, Pm, Sm, Eu, Gd, Tb, Dy, HO, Er, Tm, Vb, and Lu, and the actinides, for example, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, Nc and Lr.

Rare earth elements can be introduced into the alloys, such as CeTl, CeIn, AlCe, LaGe, etc.

From the elements of group IIIA of the Periodic table of elements as element (A) use Sc and V, of elements of the group V of the Periodic table of the elements Al, B, Ga, In and Tl, and from group members IV of the Periodic table of the elements Si, Ge, Sn and Pb. Can also be used oxides of these elements. From the IV of the Periodic table of elements include Ti, Zr and Hf, and from elements of the group VI of the Periodic table of the elements S, Se, Te and Po. Can also be used oxides of these elements.

From alkaline elements include Li, Na, K, Cs, Rb and Fr, and of the alkaline earth elements Be, Mg, Ca, Sr, Ba and Ra.

Compounds (D) containing the element (A), include, for example, hydroxides, hydrides, hydrates, etc., item (A).

2O, P2O3P2O4P2O5H3PO4and so on, salts of K, Na, Ba, and Ca, as, for example, K3PO4, K2HPO4KH2PO4, Na2HPO4nH2O Ba3(PO4)2, BAHPO4Ca(H2PO4)2and so on, and other salts, such as salts of Li, Rb, Cs, Fr, Be, Mg, Sr, Ra, Re, Rn, Os, Co, Rh, Ir, Ni, Rd, Pt and Pb.

Carbonate compounds used in the invention include, for example, CaCO3, SrCO3, BaCO3, MgCO3, Na2CO3, K2CO3, Li2CO3, CSCO3NaHCO3, KHCO32H2O, LiHCO3, CSHCO3La2(CO3)2Ce2(CO3)2, Nd(CO3)2, Eu2(CO3)2and so on

Alkali metals, alkaline earth elements and rare earth elements that can be introduced in a carbonate compound according to the invention, the same as described above.

The oxides used in the invention include the oxides of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIA, IIIB, IV and VI of the Periodic table of elements, metals of the iron group, group members IV of the Periodic table of elements, Mn and V,SJ Ti, Zr, Hf, etc.

As described above, the link in the diamond sintered material according to the invention consists of single or mixed phase from the compound (C) or the mixture (C') of the element (A) with a phosphorus compound (B) or of the above compounds (C) or the mixture (C') oxide (A).

In the invention examples MNx(PaOb)y(OH)zare, for example, CeAl3(PO4)2(OH)6, LaAl2Ga(CO4)2(OH)4, NdAlTl2(PO4)2(OH)6and so on

As described above, the link in the diamond sintered material according to the invention consists of single or mixed phase phosphorus compounds, compounds of the type of carbonate compounds or a mixture of phosphorus compounds and compounds of the type of carbonate or of the above compounds or a mixture with the metal oxide, etc.

Examples Mx[NyCO3(PaOb)z] are Ca2Ce2(CO3)2(PO4)2, Sr2La2(CO3)(P2O7), Ba4Nd(CO3)(PO4)3, Mg5La(CO3)2(PO4)3,

Ca(CeO2)(CO3)(P2O5), Na2(La2O3)(CO3(P2O5)2Ce2Al(CO3B>3)2(PO4and so on

In the material obtained from rare earth element and phosphorus compounds according to the invention, the molar ratio of rare earth element and phosphorus is preferably 0,01-0,99. In the diamond sintered material according to the invention is the material obtained from rare earth element phosphate compounds include rare earth elements and compounds of rare earth elements, phosphorus compounds, compounds containing rare earth elements and phosphorus, and a solid solution or a mixture of rare earth elements, phosphorus compounds and compounds containing rare earth elements and phosphorus.

Examples of the above material are Ce3(PO4)4, CePO4nH2O Ce2O32P2O4La2O33P2O5Ce2O35P2O5Nd4(P2O7)312H2O,

NdHP2O73H2O, NdP2O77H2O, 4LaO23P2O526H2O, La(H2PO2)3nH2O,

Ho3(PO4)4nH2O, 3HoO2P2O53H2O, LuPO4nH2O, etc.

The feature of another preferred varoga material used phosphates of the elements of group III of the Periodic table of the elements or their hydrates, acid phosphates of the elements of group III of the Periodic table of the elements or their hydrates, mixtures of oxides of elements of group III of the Periodic table of elements and oxides of phosphorus and mixtures of oxides of elements of group III of the Periodic table of elements and phosphates of the elements of group III of the Periodic table of elements. In this description under "elements of group III" refers to the elements of the group IIIA and group IIIB.

The phosphates of the elements of group III of the Periodic table of elements include, for example, BPO4, AlPO4Tl3PO4, YPO4and so on In the case, for example AlPO4the hydrate phosphate is AlPO4nH2O (n = 1/2, 2, 3, 4, and so on). As acidic phosphate is used, for example, Al(H2PO4)3and as a hydrate of the acid phosphate Al(H2PO4)33/2 H2O).

As mixtures of oxides of elements of group III of the Periodic table of elements and oxides of phosphorus can be used, for example, a mixture of B2O3and P2O5, Al2O3and P2O5, Y2O3and P2O5and so on, in Addition, can also be used a mixture of two or more oxides of elements of group III of the Periodic table of elements ve mixtures of oxides of elements of group III of the Periodic table of elements and phosphates of the elements of group III of the Periodic table of elements can be used, for example, a mixture of B2O3and AlPO4, Al2O3and YPO4and Y2O3and YPO4. Additionally, there may be used a mixture of two or more oxides of elements of group III of the Periodic table of elements and phosphates, for example, a mixture of Al2O3, Y2O3and YPO4.

These phosphates of the elements of group III of the Periodic table of the elements or their hydrates, acid phosphates of the elements of group III of the Periodic table of the elements or their hydrates, mixtures of oxides of elements of group III of the Periodic table of elements and oxides of phosphorus and mixtures of oxides of elements of group III of the Periodic table of elements and phosphates of the elements of group III of the Periodic table of elements respectively have a strong catalytic effect in respect of the diamond. Thus, in each case, the matrix is formed from diamond grains; very strongly interconnected. Difficult abnormal growth of grains in the resulting sintered material with a homogeneous structure. Therefore, you may receive the diamond sintered material with higher strength and higher resistance to fracture than the known material.

Thus obtained diamond is blitz elements and phosphorus, compounds consisting of oxides of an element of group III and oxide of phosphorus or phosphate of an element of group III. When an element of group III of the Periodic table of elements is, for example, Y, then the material comprises yttrium phosphates, such as YPO4, Y5PO10, Y8P2O17, Y4P2O11, Y3PO7, Y2P4O13, YP3O9, YP5O14and so on, and complex compounds of these phosphates, yttrium oxide yttrium, as for example, Y2O3or oxide of phosphorus, as P2O5. These materials are stable at high temperatures, for example, about 1000oC, so that the diamond sintered material according to the invention can have excellent heat resistance.

Because hydrated phosphates of the elements of group III of the Periodic table of the elements, acid phosphates or hydrated acid phosphates and mixtures of oxides of elements of group III of the Periodic table of elements and oxides of phosphorous or phosphates of the elements of group III of the Periodic table of elements possess catalytic activity at relatively low temperatures, their use as a cementing substance makes possible the production of Alma as a cementing substance, as described, for example, in the publication by the open layout of Japanese patent N 74766/1992. Namely, in this case strong enough sintered material can be obtained even at about 6 GPA and 1500oC. In the diamond sintered material according to the invention of a substance consisting of compounds containing an element of group III of the Periodic table of elements and phosphorus, it is preferable to regulate 0.1 to 30 vol.%, because when the content is less than 0.1 vol.% the deterioration in the bonding strength, i.e. the ability of the cement bond between the diamond grains, while when the content is more than 30% vol. reduced strength and durability due to the excessive content of phosphorus compounds.

As the raw material can be used powders of synthetic diamond, natural diamond and polycrystalline diamond. The grain diameter of the powder is preferably in the range of 0.01 to 200 μm, depending on the use of the material can be applied to various powders made with fine or coarse grains or with a mixture of small and large grains.

Instead of these diamonds can be used non-diamond carbon materials such as graphite, glassy graphy is according to the invention, the diamond is present in proportions 50-99,9 vol.%, because if its content is less than 50 vol.% reduced wear resistance, while when the content is more than 99.9 vol.% worse cementing. The preferred range of its content is 50-99,5 vol.%, in particular 70-90 vol.%. As the diamond raw material can be used odnokristalnye diamond powder, suitable for abrasive powder or polycrystalline diamond powder. The average diameter of the grains in these powders is preferably about 0.01-200 μm. On the other hand, the powder of cementing ligament has a diameter of grains of about 0.01-30 μm, preferably about 0.1-10 microns, preferably less than the diameter of the grains of diamond powder especially when they are mixed with diamond powder and subjected to sintering.

As for the method of production of the diamond sintered material according to the invention, it is possible to use any of the methods comprising (I) mixing a powder of at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IVA, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals; powder, at least one Oki least one phosphorus compounds (B) and diamond powder or graphite, maintaining and sintering the resulting mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond and (II) a preliminary synthesis of the compound (S) of at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals with at least one phosphorus compound (In) or complex compounds (C) and at least one oxide of element (A), mixing the powder of the compound (C) or mixed with diamond powder or graphite, maintaining and sintering the resulting mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond.

In addition, the sintering according to the invention can also be carried out according to the method, which includes the formation of compound (C) in the form of thin pieces or thin sheets, mixing it with a diamond or graphite powder or the introduction of it into contact with a diamond or graphite powder, keeping them under pressure and at a temperature in thermodynamically stable region of diamond, thereby impregnating almosnino material according to the invention consists in (I) mixing the above-mentioned powders of the phosphorus, powders of carbonate compounds and oxide powder, adding diamond powder to them, their respective mixing and sintering the resulting mixture of powders at high pressure and at high temperature and (II) the preliminary preparation of compounds consisting of phosphate-carbonate compounds or phosphate compounds, carbonate compounds and nitric oxide at normal pressure, the grinding compound in the powder, the corresponding mixing the resulting powder with diamond powder and sintering the mixture under high pressure and at high temperature. In addition, there may be used another method, which includes the preparation of compounds consisting of phosphate-carbonate compounds or phosphate compounds, carbonate compounds and nitric oxide at normal pressure, grinding compounds in powder, molding the resulting powder into a thin crust, a thin sheet or substrate for the sintered material, combine it with a diamond or graphite powder, keeping the block under pressure and temperature in thermodynamically stable region of diamond, thereby impregnating the diamond powder compound.

In kachestve there are two ways, includes (I) the use of a mixture of rare earth element, phosphorus compounds and diamond powder as raw material, and maintaining the mixture under high pressure and at high temperature and (II) the preliminary reaction of rare-earth metal phosphate compound with the formation of the rare-earth metal phosphate compound, mixed with diamond powder and sintering the mixture.

Pre-prepared compound of rare earth element and phosphorus compounds is pressed into the form, together with a diamond or graphite powder, maintain the workpiece in a stable region of diamond and thus impregnated with diamond powder compound.

As other preferred variants of the methods of production of the diamond sintered material according to the invention there are two ways, which includes (I) mixing diamond powder or non-diamond carbon powder with a mixture of phosphate of an element of group III of the Periodic table of elements or its hydrate of the acid phosphate of an element of group III of the Periodic table of elements or its hydrate or oxide of an element of group III of the Periodic table of elements and oxides of phosphorus or FOSFA thermodynamically stable region of diamond and (II) layering molded material from the diamond powder or non-diamond graphite powder and molded material from a mixture of phosphate of an element of group III of the Periodic table of elements or its hydrate, acid phosphate of an element of group III of the Periodic table of elements or its hydrate or oxide of an element of group III of the Periodic table of elements and oxides of phosphorus or phosphate of an element of group III of the Periodic table of elements, and curing the resulting laminate under pressure and at a temperature in thermodynamically stable region of diamond.

In the method, including the use of raw material and cementitious substances, raw material and cementing substance mechanically mix the wet or dry method and is sintered at high pressure and temperature. Even in the case when the raw powder material consists of small grains, cementing substance can be uniformly dispersed, it makes possible the production of the diamond sintered material having a shape with a large thickness. For example, this method is suitable for the production of cutting tools (fine-grained sintered material) to get a good polished surface and sintered material for the manufacture of thick products, such as stamps. However, in the case of coarse-grained raw material it is difficult to provide rawname the lamination and stacking of raw material and cementitious substances, prepare plates respectively of raw material and cementing substance, and stack them in layers so that they touch each other, and then treated at high pressure and temperature, during which the cementing substance diffuses and penetrates the layer of raw material, and the diamond grains are sintered. This method is especially suitable for the production of sintered material for the manufacture of wear-resistant tools for drill bits due to the uniform addition of cementing substances, even when using a coarse-grained raw material, and thus contributes to the sustainable obtaining a diamond sintered material with high strength and high wear resistance.

According to the production method according to the invention it is possible to obtain a diamond sintered material with a hardness of about 8000 kg/mm2preferably 8000-T kg/mm2that can find practical application, even if the sintering is carried out at a lower pressure and temperature than when using the known carbonate solvents, for example, at a pressure of 5 GPA and a temperature of 1200-1500oC.

Diamond sintered material according to the invention is suitable as an abrasive powder.

Example 1. As a cementing substance used YPO4. A synthetic diamond powder with an average diameter of 3.5 µm grains and powder YPO4sufficiently mixed in a ratio of respectively 95% vol. and 5 vol.%, the mixture was loaded in a mo capsule, and maintained and specaly under pressure of 7.5 GPA and at a temperature of 2000oC for 15 min in the tape device type to create ultra-high pressure and high temperature. The composition of the resulting diamond sintered material was identified by x-ray diffraction to detect about 5 vol.% YPO4in addition to the diamond.

Measurement of the hardness of the sintered material by the indenter Krupa showed a high hardness of the material, i.e. 7800 kg/mm2. When the impact strength of the sintered material was measured by the method of incision and compared it with toughness commercially available sintered material with cobalt ligament, the first material showed specific impact strength almost 1.3 times greater than that of the latter material. When the resulting sintered material was heated at 1000oC in vacuum with subsequent measurement of hardness and toughness, their changes after this is the quality cementing substances used a mixture of Y2O3and P2O3in the ratio of 1:1 (by volume), customized amount of this mixture to 5% vol. and regulate the pressure and the sintering temperature up to 6.5 GPA and 1750oC, thus obtaining a diamond sintered material. Resulting in the sintered material contained YPO4and had a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 3. Repeating example 1, except that as a cementing substance used a mixture YPO4and P2O3in the ratio of 1:2 (by volume), customized amount of this mixture to 5% vol. and regulate the pressure and the sintering temperature up to 6.5 GPA and 1750oC, thus obtaining a diamond sintered material. The resulting sintered material contained Y5PO10and had a hardness, toughness and heat resistance, similar to the indicators in example 4.

Example 4. As a cementing substance used YPO4. Powder of synthetic diamond with an average diameter of grains of 15 μm and graphite powder with an average diameter of grains of 10 μm appropriately mixed in the ratio 3: 2 by volume and extruded in the form to a thickness of 2 mm, while the powder YPOoC for 15 min in the tape device type to create ultra-high pressure and high temperature. The composition of the resulting diamond sintered material was identified by x-ray diffraction to detect about 2 vol.% YPO4in addition to the diamond.

Measurement of the hardness of the sintered material by the indenter Krupa showed high hardness, i.e., about 8200 kg/mm2. When the impact strength of the sintered material was measured by the method of incision and compared it with toughness commercially available sintered material with cobalt ligament, the first material showed specific impact strength almost 1.4 more than the latter material. When the resulting sintered material was heated at 1000oC in vacuum with subsequent measurement of hardness and toughness, their changes after this treatment were hard-to-find.

Examples 5-1 - 5-4 and comparative examples 1-1 and 1-2. 17,2 dioxide cerium (0,1 molar equivalent) and 70 g of metaphosphate potassium (a 0.4 molar equivalent) were mixed, and then heated and melted in the crucible. The mixture is cooling the were given a phosphate of cerium. The resulting cerium phosphate was ground into powder in an agate mortar to the size of grains of approximately 1-2 microns, was mixed with diamond powder (abrasive powder with a diameter of 30 μm grains) in the ratio shown in table. 1, maintained and specaly under pressure of 6.5 GPA and at a temperature of 1600oC for 30 min in the tape device type to create ultra-high pressure and high temperature. When measuring hard diamond sintered material obtained data on the hardness shown in table. 1.

In comparative example 1-2 30% vol. calcium carbonate and 70 vol.% the diamond powder was mixed and specaly under the same conditions as described above. The resulting sintered material was of such low hardness, i.e. 3200 kg/mm2that it could not be used for tools.

Example 6. of 12.6 g of metallic lanthanum, of 13.9 g of phosphorus oxide (P2O5and diamond powder with a diameter of 30 μm grains were mixed, and then stood and specaly under a pressure of 6 GPA and at a temperature of 1500oC for 40 min in the device type cubic anvil to create ultra-high pressure and high temperature. The resulting diamond sintered material you and rays to determine turned if a diamond to graphite (test for heat resistance). Comparing the hardness before and after heating. The results are presented in table. 2.

Comparative example 2. Repeating example 6, except that to obtain the results shown in table. 2, as a cementing substance instead of lanthanum phosphate used amandit from an alloy of Fe - Co.

As can be seen from the results in table. 2, the diamond sintered material according to the invention retains high hardness Vickers, not deteriorating even after heating when tested for heat resistance. On the other hand, in comparative example 2 was much reduced hardness Vickers and graphite was discovered, which suggests that the sample for comparison has the worst heat resistance than the sample according to the invention.

Example 7. From the diamond sintered material obtained in example 6, were made insert for a cutting tool, which is then used for cutting casting of aluminum alloy (silicon content of 10 wt.%). Cutting smoothly performed without destruction of the cutting edge.

Examples 8-1 - 8-4 and comparative examples 3-1 and 3-2. and 17.2 g of cerium dioxide (0,1 molar equivalent) and 70 g of metaphosphate Quartet, was dissolved in water and subjected to treatment with hydrochloric acid, and then received a phosphate of cerium by filtration. The resulting phosphate of cerium in an agate mortar was ground into powder with a particle size of about 1-2 microns, was mixed with diamond powder (abrasive powder with a diameter of grains 4 μm) in the ratio shown in table. 3, and stood and specaly under pressure of 6.5 GPA and at a temperature of 1600oC for 15 min in the tape device type to create ultra-high pressure and high temperature. When measuring the hardness of the resulting diamond sintered material obtained results are shown in table. 3.

In comparative example 3-2 30% vol. calcium carbonate and 70 vol.% the diamond powder was mixed and specaly under the same conditions as described above. The resulting sintered material was of such low hardness, i.e. 3000 kg/mm2that it could not be used for tools.

Example 9. of 12.6 g of metallic lanthanum, of 13.9 g of phosphorus oxide and diamond powder with a diameter of grains of 4 μm were mixed, and then stood and specaly under a pressure of 6 GPA and at a temperature of 1500oC for 15 min in the device type cubic anvil to create the ultra d is oC for 10 min and then examined the x-rays to determine, has become the diamond to graphite (test for heat resistance). Comparing the hardness before and after heating. The results are shown in table. 4.

Comparative example 4. Repeating example 9, except that as a cementing substance instead of lanthanum phosphate used amandit from an alloy of Fe - Co. The results obtained are shown in table. 4.

As can be seen from the data table. 4, the diamond sintered material according to the invention retains a high Knoop hardness, not deteriorating even after heating when tested for heat resistance. On the other hand, in comparative example 4 after heating was much reduced Knoop hardness and graphite were found, which suggests that the sample for comparison has the worst heat resistance than the sample according to the invention.

Example 10. From the diamond sintered material obtained in example 9, were made insert for a cutting tool, which is then used for cutting casting of aluminum alloy (silicon content of 25 wt.%). Cutting smoothly performed without destruction of the cutting edge.

Example 11. Repeating example 1, for isklyuchatelei, containing BPO4and having a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 12. Repeating example 1, except that as a cementing substance used 5% vol. AlPO4to obtain a sintered material containing AlPO4and having a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 13. Repeating example 1, except that as a cementing substance used 5% vol. AlPO42H2O and regulate the pressure and the sintering temperature up to 6.5 GPA and 1650oC in order to obtain a sintered material containing AlPO4and having a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 14. Repeating example 1, except that as a cementing substance used 5% vol. Al(H2PO4)3and regulate the pressure and the sintering temperature up to 6.5 GPA and 1650oC in order to obtain a sintered material containing AlPO4and having a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 15. Repeating example 1, except that in the caña and the sintering temperature up to 6.5 GPA and 1650oC in order to obtain a sintered material containing AlPO4and having a hardness, toughness and heat resistance, similar to the indicators in the example 1.

Example 16. As a cementing substance used BPO4. Plate of sintered material thickness 2 mm, consisting of a powder of high-purity isotropic graphite with an average diameter of 3 μm grains and powder BPO4, extruded in the form to a thickness of 1 mm were alternately stacked layers were loaded into a molybdenum capsule, sustained and specaly under pressure of 7.5 GPA and at a temperature of 2000oC for 15 min in the ring-type device to create ultra-high pressure and high temperature. The composition of the resulting diamond sintered material was identified using x-ray diffraction to detect almost 3% vol. BPO4in addition to the diamond.

Measurement of the hardness of the sintered material by the indenter Krupa showed high hardness, i.e., about 8200 kg/mm2. When the impact strength of the sintered material was measured by the method of incision and compared it with toughness commercially available sintered material with cobalt ligament, the first material is Tate sintered material was heated at 1000oC in vacuum with subsequent measurement of hardness and toughness, their changes after this treatment were hard-to-find.

Comparative example 5. Repeating example 1, except that as a cementing substance used BPO4added a very small amount of powder BPO4(about 0.05 T.%) to the powder of synthetic diamond with an average diameter of grains of 3.5 μm and adequately mixing them to prepare a raw material. However, in the resulting sintered material remained green part.

Comparative example 6. Repeating example 1, except that as a cementing substance used AlPO4to 40 vol.% AlPO4added about 60 vol.% powder of synthetic diamond with an average diameter of grains of 3.5 μm and adequately mixing them to prepare a raw material. However, the resulting diamond sintered material had insufficient adhesion of the grains with each other and low hardness, i.e. 3500 kg/mm2.

Example 17-1. to 0.2 molar equivalent of acid phosphate sodium (Na2HPO4)was added to a solution of 0.2 molar equivalent chloralkali of 0.3 molar equivalent of powder alloy lCe and heated for education CeAl3(PO4)2(OH)6. Mixed 10% vol. thus obtained compound in powder form and 90 vol.% diamond powder with a particle size of 30 μm, and the resulting mixture powder was kept and specaly under pressure of 5.8 GPA and at a temperature of 1400oC in the reactor to create a very high pressure. The resulting diamond sintered material showed a Vickers hardness in the 14000 kg/mm2that testified to the fact that sintering occurred to a sufficient degree.

When the diamond sintered material produced cutting tool, which is used for milling of alloy Al - Si (cutting speed of 500 m/min and depth of cut of 0.1 mm), it was confirmed that the product has sufficient cutting ability and excellent resistance to destruction.

Example 17-2. In example 17-1 has repeatedly changed the ratio in the mixture (molar ratio) alloy AlCe and CePO4(H2O)3and the mixture was subjected to heat treatment for the formation of compounds expressed by the formula CeAlx(PO4)y(OH)zwhere 1x4,5, u and 1z26. Each of the resulting products were crushed into powder. To 10% vol. this powder was added to 90 vol.% diamond porooC in the device to create a very high pressure, thus obtaining the highly rigid diamond sintered material with hardness Vickers 13000-15000 kg/mm2.

Example 18-1. Dioxide lanthanum mixed with metaphosphate potassium and sodium, and the mixture was molded, after which the mixture was treated with acid to remove the NaLaP2O7and then got LaPO4. Acid phosphate of lanthanum and sodium [NaLaH(PO4)2] thermally decomposed with the formation of 3CeO2P2O53H2O. in Addition, sodium phosphate and lanthanum nitrate reacted with the formation of La4(P2O7)312H2O.

The three of phosphated lantonov in the mixture and the amount of added alloy GaLa repeatedly cheated to get LaGa2(PaOb)2(OH)6. This compound could be synthesized only when a = 1 or 2 and b = 2, 3, 4, 5, or 7 and could not be synthesized in other respects.

Each of the resulting products were crushed into powder. To about 20. % of this powder was added 80% vol. diamond powder with a diameter of 30 μm grains and a mixture of powders as powdery raw material was kept and specaly under pressure to 5.7 GPA and tempery sintered material with hardness Vickers 14000 kg/mm2.

It is established that the resulting sintered material does not corrode under the action of acids or alkalis and has high corrosion resistance.

Example 18 - 2. To 1% vol. each powder LaGa3(PaOb)2(OH)6obtained in example 18 - 1, was added to 99 vol.% diamond powder (average particle size of 2 μm), properly mixed and the mixture as a raw material was loaded into the capsule, and maintained and specaly under a pressure of 6 GPA and at a temperature of 1500oC for 1 h, thus obtaining a diamond sintered material with hardness Vickers 8000 kg/mm2in each case.

In addition, 50% vol. each powder LaGa3(PaOb)2(OH)6obtained in example 18 - 1, was added 50% vol. diamond powder (average particle size of 30 μm), properly mixed, extruded into the form of a disk, and then subjected to sintering under the same conditions as described above, thus obtaining a diamond sintered material with hardness Vickers 8000 kg/mm2in each case.

Example 19. CePO4M(H2O)3prepared in example 17 - 1, Nd2O3(P2O5oC for 50 min in the device to create a very high pressure, thus obtaining a diamond sintered material with hardness Vickers 15000 kg/mm2.

When the resulting sintered material was heated in vacuum at a temperature of 1200oC and cooled, after which it re-measured hardness Vickers, she was still 15000 kg/mm2that suggests that the diamond sintered material has a high heat resistance.

Example 20 - 1. to 0.2 molar equivalent of acid phosphate sodium (Na2HPO4) was added to a solution of 0.2 molar equivalent of cerium chloride, was heated to precipitate Grey4(H2O)3and was collected by filtration. To the precipitate was added to 0.3 molar equivalent of powder alloy AlCe and heated for education CeAl3(PO4)2(OH)6. Mixed 5% vol. thus obtained compound in powder form and 95 vol.% diamond powder with a particle size of 4 μm, and the resulting mixture of powders as Saravia ultra high pressure. The resulting diamond sintered material showed Knoop hardness 8200 kg/mm2that suggests that the sintering took place in a sufficient degree.

When the diamond sintered material produced cutting tool, which is then used for milling of alloy Al - Si (cutting speed of 500 m/min and depth of cut of 0.1), has confirmed that the product has sufficient cutting performance and excellent resistance to destruction.

Example 20 - 2. In example 20 - 1 has repeatedly changed the ratio (molar ratio) alloy AlCe and Grey4(H2O)3in the mixture, and the mixture was subjected to heat treatment for the formation of compounds expressed by the formula CeAlx(PO4)y(OH)zin which 1 x4,5, 1y5 and 1z26. Each of the resulting products were crushed into powder. To 5% vol. this powder was added 95% vol. diamond powder with a diameter of 4 µm grains, and the mixture powders were passed and specaly under pressure of 5.8-6.0 GPA and at a temperature of 1400-1450oC in the device to create a very high pressure, thus obtaining the highly rigid diamond sintered material with a Knoop hardness 8.000 to 9.000 kg/mm2.

Example 21 - 1. Dioxide lanthanum Pach is UB>7and then got LaPO4. Acid phosphate of lanthanum and sodium [NaLaH(PO4)2] thermally decomposed to education 3CeO2P2O53H2O. in Addition, sodium phosphate and lanthanum nitrate reacted with the formation of La4(P2O7)312H2O.

The three of phosphated lantonov and the number of added alloy GaLa in the mixture has repeatedly changed to obtain LaGa(3PaOb)2(OH)6. This compound could be synthesized only when a = 1 or 2 and b = 2, 3, 4, 5, or 7 and could not be synthesized in the case of other relations.

Each of the resulting products were crushed into powder. To about 10. % of this powder was added to 90 vol.% diamond powder with a diameter of 4 µm grains, and the mixture of powders as powdery raw material was kept and specaly under pressure to 5.7 GPA and at a temperature of 1400oC for 15 min in the device to create a very high pressure, thus obtaining a diamond sintered material with a Knoop hardness 8200 kg/mm2.

It is established that the resulting sintered material does not corrode under the action of acids or alkalis and has high corrosion resistance, it is received in example 21-1, added to 99.5 vol.% diamond powder (average particle size of 2 μm), properly mixed, and the mixture as a raw material was loaded into the capsule, and maintained and specaly under a pressure of 6 GPA and at a temperature of 1500oC for 15 min in the device to create ultra-high pressure and high temperature, thus obtaining a diamond sintered material with a Knoop hardness 8600 kg/mm2.

In addition, 50% vol. each powder LaGa3(PaOb)(OH)6obtained in example 21-1, was added 50% vol. diamond powder (average particle size of 30 μm), properly mixed, extruded into the form of a disk, and then subjected to sintering under the same conditions as described above, thus obtaining a diamond sintered material with a Knoop hardness of 7000 kg/mm2in each case.

Example 22. CePO4(H2O)3prepared in example 20-1, Nd2O3(P2O5)2obtained by thermal decomposition Nd HPO43H2O, CaO and GeS, respectively, were crushed into powder and properly mixed in the ratio 3:3:3:1 by volume. 1% vol. the mixture powders were then mixed with 99% vol. diamond powder with a diameter of grains 4 50oC for 15 min in the device to create a very high pressure, thus obtaining a diamond sintered material with a Knoop hardness 8400 kg/mm2.

When the resulting sintered material was heated in vacuum at a temperature of 1200oC and cooled, after which it re-measured hardness Vickers, she barely had changed and was 1500 kg/mm2that suggests that the diamond sintered material had a high heat resistance.

Example 24. In aqueous solution carried out the reaction between (NH4)2Ce(NO3)6H2O and Na2HPO4the purpose of the deposition and synthesis Ce3(PO4)48H2O. the Resulting compound was dried and mixed with powder CaCO3and powder of Fe2O3in the ratio 5: 3: 2 by volume. For the preparation of the raw powder material 97% diamond powder with a particle size of 1-2 microns is well mixed with 3 vol.% the resulting mixture powder. Raw powdered material is extruded in the form and kept under a pressure of 5.5 GPA and at a temperature of 1300oC for 15 min in the reactor high pressure, thus obtaining a diamond sintered material, will the sintered material was heated in nitrogen atmosphere at a temperature of 1200oC for 30 min, and cooled, and then re-measured Knoop hardness, it barely changed and was 8200 kg/mm2that suggests that the diamond sintered material had a high heat resistance.

Example 25. Diamond sintered material prepared in the same manner as in example 24, except that used CeHP2O73H2O instead of (NH4)2Ce(NO3)62P2O5and used the same instead of Ce(PO4)48H2O. the Obtained results similar to the results in example 24.

Example 26. In example 23 LaPO45H2O and SrCO3were mixed and heated to the synthesis of La3Sr2(CO3)2(PO4)3. This compound was ground into powder and well mixed with CaO powder in the ratio of 8:2 by volume. 0,5% vol. the mixture of powders was added to 99.5 vol.% diamond powder, well mixed and extruded in the form. The pressed material was kept and specaly under pressure of 5.2 GPA and at a temperature of 1200oC for 60 min in the reactor high pressure, thus obtaining a diamond sintered material, as well sintered and having a Vickers hardness 18000 kg/mm2.

From polucelym solder to the base metal and used for cutting Sandstone or shale with a cutting speed of 100 m/min Cutting was held without chipping, and it is, therefore, confirmed that the sintered material had excellent resistance to destruction.

50. % the above powder La3Sr2(CO3)2(PO4)3and 50% vol. diamond powder with a diameter of grains of 20 μm was mixed and specaly under the same conditions as described above to obtain a sintered material with a Vickers hardness equal to 8000 kg/mm2.

Example 27. In example 24 LaPO45H2O and SrCO3were mixed and heated to the synthesis of La3Sr2(Co3)2(PO4)3. This compound was ground into powder and well mixed with CaO powder in the ratio of 6:4 by volume. 0,2% vol. the mixture of powders was added to 99,8% diamond powder, well mixed and extruded in the form. The pressed material was kept and specaly under pressure of 5.2 GPA and at a temperature of 1200oC for 15 min in the reactor high pressure, thus obtaining a diamond sintered material, as well sintered and having a Knoop hardness 8600 kg/mm2.

From the resulting diamond sintered material made of a round box, which was soldered with hard solder to Oslo without chipping, and it is, therefore, confirmed that the sintered material had excellent resistance to destruction.

50. % the above powder La3Sr2(CO3)2(PO4)3and 50% vol. diamond powder with a diameter of grains of 20 μm was mixed and specaly under the same conditions as described above to obtain a sintered material having a Knoop hardness 7400 kg/mm2.

Example 28. Repeating the procedure of example 26, except that used a carbonate of an alkali metal, i.e., Na2CO3, and carbonate of alkaline earth metal, i.e., BaCO3instead SrCO3to obtain a diamond sintered material according to the invention. When the resulting sintered material produced box and used it for testing by cutting a similar way, it was confirmed that this sample also has excellent resistance to destruction.

Example 29. Nd2O32P2O5, CaCO3, SrCO3, Na2SO2and SiO2were mixed and heated to obtain a mixed phase of Nd2Ca2CO3(PO4)3and oxides. The resulting mixed phase were crushed into powder. 10% vol. powder well soliform and extruded material, maintained and specaly under pressure of 5.4 GPA and at a temperature of 1350oC for 30 min in the reactor high pressure, thus obtaining a diamond sintered material, as well sintered and having a Vickers hardness 14500 kg/mm2.

It is established that the resulting sintered material is not corroded by the action of acids or alkalis and has high corrosion resistance.

Example 30. Nd22P2O5, CaCO3, SrCO3, Na2SO2and SiO2were mixed and heated to obtain a mixed phase of Nd2Ca3(PO4)3, CO3(PO4)3and oxides. The resulting mixed phase were crushed into powder. 5% vol. the fine powder was mixed with 95% vol. diamond powder with a particle size of 5 μm, the resulting mixture of powders extruded in the form and extruded material was kept and specaly under pressure of 5.4 GPA and at a temperature of 1350oC for 15 min in the reactor high pressure, thus obtaining a diamond sintered material, as well sintered and having a Knoop hardness of 8000 kg/mm2.

It is established that the resulting sintered material tier 31. Diamond sintered materials obtained in examples 18-2 and 21-2, crushed with the formation of abrasive powder having an average diameter of grains 30 minutes When using the resulting abrasive powder for polishing a flat surface synthetic diamond obtained best results.

Example 32. Diamond sintered material obtained in example 29, crushed with the formation of abrasive powder having an average diameter of grains of 20 μm. When using the resulting abrasive powder for polishing a flat surface synthetic diamond obtained best results.

Example 33. From a powder of cerium phosphate (1-2 μm) prepared in the same manner as in example 5, and synthetic diamond powder with an average diameter of grains 15 μm, respectively, were molded plate of thickness 1 mm and 2 mm, were alternately layered and loaded into a molybdenum capsule, then stood and specaly under pressure of 6.5 GPA and at a temperature of 1600oC for 15 min in the tape device type to create a very high pressure. The composition of the resulting diamond sintered material identified by diffraction rentgenowskiego material through indenter Krupa was defined high hardness, i.e. equal 8200 kg/mm2.

Example 34. Repeated example 33, except that instead of a phosphate of cerium used CeAl3(PO4)2(OH)6prepared in the same manner as in example 17-1. The result has been a diamond sintered material having a Knoop hardness equal to 8000 kg/mm2.

As shown above, in accordance with the invention can be represented superior diamond sintered material having excellent fracture resistance, corrosion resistance, heat resistance and wear resistance and capable of ensuring at relatively low pressure and temperature, which was not possible up to the present time. This, of course, has the result of reducing the cost of production of the diamond sintered material and contributes to the development of industrial technology. Another feature of the diamond sintered material according to the invention consists in a high electrical resistance, for example at least 104Om see, In particular, the tools used diamond sintered material according to the invention, and abrasive powders obtained by grinding the diamond sintered material, have been successfully used for industrial purposes in view, characterized in that it contains a diamond in the number of 50 - 99,0%, and the binder phase consists of a phosphate compound (C) at least one element (A) selected from the group consisting of rare earth metals, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, the group of iron, Mn, V, alkali metals and alkaline earth metals, or mixtures of (C') expressed by the formula MNx(PaOb)y(OH)zin which M is a simple substance or solid solution of at least one element selected from the group consisting of rare earth metals, alkaline earth metals and elements of group IV of the Periodic table of elements, N is a simple substance or solid solution of at least one element selected from the group consisting of elements of group IIIB of the Periodic table of elements and sulfur, and x, y and z are respectively in the range of 1x4,5, 1y5 and 1z26, or connection (S) with the oxide of the element (a) or the mixture (C') with the oxide of the element (A).

2. The material under item 1, characterized in that the binder phase mainly consists of material derived from the rare earth element and phosphorus compounds.

3. The material under item 1, characterized in that the binder phase DOPOLNITEL phosphorus compound, carbonate compound and the oxide.

5. Material according to any one of p. 3 or 4, characterized in that the binder phase contains a phosphate-carbonate compound or oxide phosphate-carbonate compounds derived from phosphorus compounds, carbonate compounds and nitric oxide.

6. Material according to any one of paragraphs.3 to 5, characterized in that the phosphorus compound contains at least one element selected from the group consisting of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIB, IV and VI of the Periodic table of elements.

7. Material according to any one of paragraphs.3 to 6, characterized in that the carbonate compound contains at least one element selected from the group consisting of rare earth elements, alkali metals, alkaline earth metals, Mn and V

8. Material according to any one of paragraphs.3 to 7, characterized in that the binder phase of the phosphorus compounds and carbonate compounds contains at least one element selected from the group consisting of rare earth elements, alkali metals, alkaline earth metals, elements of groups IIIB, IV and VI of the Periodic table of elements.

9. Material according to any one of paragraphs.4 and 5, characterized Ltd, alkali metals, alkaline earth metals, elements of groups IIIB, IV and IV of the Periodic table of elements, metals of the iron group, Mn and V

10. Material according to any one of p. 3 or 4, characterized in that the binder phase of the phosphorus compounds and carbonate compounds are Apatite expressed by the formula Mx[NyCO3(PaOb)7], in which a single element or solid solution of at least one element selected from the group consisting of rare earth elements, alkaline elements, alkaline earth elements, P, Mn and V, and N is at least one element or oxide selected from the group consisting of rare earth metals, elements of groups IIIB, IV and VI of the Periodic table of elements and oxides of group IV of the Periodic table of elements or oxides of metals, and x, y and z are respectively in the range 1x7, and 1y6 1z6, and is 1 or 2, b is 2, 3, 4, 5, or 7.

11. The material on p. 11, characterized in that the binder phase mainly consists of compounds containing an element of group III of the Periodic table of elements and phosphorus in a proportion of 0.1 to 30% by volume.

12. The material on p. 11, characterized in that a compound containing an element of group III of the Periodic is ablity elements and oxides of phosphorus.

13. Material according to any one of p. 11 or 12, characterized in that a compound containing an element of group III of the Periodic table of elements and phosphorus is phosphate of an element of group III of the Periodic table of elements.

14. Material according to any one of paragraphs.11 to 13, characterized in that the elements of group III of the Periodic table of elements are B, Al and V

15. Method of manufacturing a diamond sintered material comprising mixing diamond powder or graphite powder binder, curing and sintering a mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that the powder of diamond or graphite mixed with a powder of at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, powder of at least the compound (D), containing the element (a), phosphorus powder or at least one phosphorus compounds (B).

16. The method according to p. 15, characterized in that the mixing is subjected diamond powder or Almazny carbon powder or a mixture of diamond IANA least one rare earth metal, and phosphate compound.

17. Method of manufacturing a diamond sintered material comprising mixing diamond powder or graphite powder binder, curing and sintering a mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that before mixing carry out the synthesis of the compound (C) at least one element (A) selected from the group consisting of rare earth elements, elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, with at least one phosphorus compound (B) or a mixture of the compound (C) with at least one oxide of element (A), and mixing diamond powder or graphite is carried out with a powder of the compound (C) or a mixture of the compound (C) with at least one oxide of element (A).

18. The method according to p. 17, characterized in that before mixing carry out the synthesis of compounds of the rare earth metal and phosphorus compounds, and the mix is subjected to powder the resulting compound with diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder.

< with binder phase, maintaining and sintering under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that the material of binder used pre-cooked thin crust, a thin sheet or substrate of sintered material consisting of compounds (C) at least one element (A) selected from the group consisting of rare earth elements of groups IIIA, IIIB, IV, IV and VI of the Periodic table of elements, metals of the iron group, Mn, V, alkali metals and alkaline earth metals, with at least one phosphorus compound or mixture of compounds (C) at least one oxide of element (A), and the Association of diamond powder or graphite with a thin crust, a thin sheet or substrate of sintered material is carried out by layering the material of binder from the molded powder of diamond or graphite.

20. The method according to p. 19, characterized in that it performs layering of binder in the form of a molded material from a powder of rare earth metal or powder alloy containing at least one rare earth element, and powder phosphorus compounds and molded material from the diamond powder or non-diamond carbon powder sludge which are the synthesis of compounds of the rare earth metal and phosphorus compounds with subsequent layering of the molded material from the resulting powder compounds and molded material from the diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder.

22. Method of manufacturing a diamond sintered material comprising a mixed powder of binder with diamond powder and sintering a mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that, as a binder when mixed uses at least one component selected from the group consisting of powders of phosphorus compounds, powders, carbonate compounds, powders phosphate-carbonate compounds, powders of oxides of phosphorus and carbonate compounds, and at least one oxide powder.

23. Method of manufacturing a diamond sintered material comprising a mixed powder of binder with diamond powder and sintering a mixture of powders under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that before mixing receive a combination or mixture, consisting of at least one component selected from the group consisting of phosphorus compounds, carbonate compounds, phosphate-carbonate compounds and phosphoric oxide-carbonate compounds, at least one of the oxides and turn it into powder.

24. Method of manufacturing almazopodobnoi at a temperature in thermodynamically stable region of diamond, characterized in that before merging carry out the mixing at least one component selected from the group consisting of powders of phosphorus compounds, powders, carbonate compounds, powders phosphate-carbonate compounds, powders of oxides of phosphorus and carbonate compound and at least one oxide powder to obtain a mixture of powders, or prior receipt of compounds or a mixture of at least one component selected from the group consisting of phosphorus compounds, carbonate compounds, phosphate-carbonate compounds and phosphoric oxide-carbonate compounds, and at least one oxide, turn it into powder, cooking thin piece of thin sheet or substrate the sintered material of a mixture of powders.

25. Method of manufacturing a diamond sintered material comprising mixing diamond powder or graphite powder binder, curing and sintering of powders with him under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that, as a powder binder phase, use powder phosphate of an element of group III of the Periodic table of elements, and mixing phosphomannose carbon powders.

26. Method of manufacturing a diamond sintered material comprising combining a binder phase powder of diamond or graphite, maintaining and sintering under pressure and at a temperature in thermodynamically stable region of diamond, characterized in that as the binder phase, use the molded material from a powder of phosphate of an element of group III of the Periodic table of elements, and the Association is carried out by stratifying molded material binder and molded material from the diamond powder or non-diamond carbon powder or a mixture of diamond and non-diamond carbon powder.

27. The method according to any of the p. 25 and 26, characterized in that as phosphate use hydrate phosphate, acid phosphate or hydrogen phosphate hydrate.

28. The method according to any of the p. 25 or 26, characterized in that as the binder phase, use a mixture of oxide of an element of group III of the Periodic table of elements and oxides of phosphorus.

29. The method according to any of the p. 25 or 26, characterized in that as the binder phase, use a mixture of oxide of an element of group III of the Periodic table of elements and phosphate of an element of group III of the Periodic table of elements.

30. The method according to Liu is ini or yttrium.

31. The tool of the diamond sintered material for cutting, polishing and drilling, containing cutting edge, wherein the cutting edge is made of diamond sintered material under item 1 or 3.

32. Abrasive powder containing powdered diamond sintered material, characterized in that as the crushed diamond sintered material it contains material on p. 1 or 3.

Priority points:

30.08.95 on PP.1-5;

16.09.94 on PP.2, 6-10, 15-24, 31, 32;

27.04.95 on PP. 11-14, 25-30.

 

Same patents:
The invention relates to electroplating and can be used in mechanical engineering, instrumentation and other industries, with the aim of extending the use of parts in units of machines, mechanisms, and molds, with increased microhardness

The invention relates to powder metallurgy, in particular to exothermic mixtures for the production of composite materials by the method of self-propagating high temperature synthesis

The invention relates to the manufacture of abrasives, including diamond tools mainly in the form of thin rods and wire and can be used in the processing of highly rigid materials by cutting, drilling, grinding and t

Abrasive granule // 2100175

Abrasive tool // 2092302
The invention relates to the production of abrasive tools on the basis of making an abrasive mixture of materials with different characteristics in terms of hardness and brittleness

The invention relates to the production of abrasives and can be used in bandpass, circular saws and drilling columns

Abrasive tool // 2082599

The invention relates to the processing of polymer composite materials can be used in stone

FIELD: technological processes.

SUBSTANCE: invention claims diamond tool manufactured with monocrystallic diamond, synthesised under high pressure by temperature gradient method, so that the claimed diamond crystal contains not more than 3 parts per million of nitrogen. The tool features a blade with its edge oriented in plane (110), so that Knoop scale hardness at the plane (100) in direction <110> is higher than in direction <100>. Such synthetic monocrystallic diamond is synthesised by temperature gradient method under superhigh pressure and high temperature, and its crystals contain nickel atoms introduced by atomic substitution or boron and nickel atoms introduced by atomic substitution.

EFFECT: obtaining cheap synthetic monocrystallic diamonds with reduced flaw number.

24 cl, 4 ex, 2 tbl, 7 dwg

FIELD: metallurgy.

SUBSTANCE: it is prepared mixture of abrasive dust of coarse grain and, at least, of one fine grain, mixture of powders is compacted and impregnated by metals or alloys. In the capacity of powders, at least, of one fine grain there are used powders, surface of which fulfil wettability conditions by impregnating metals or alloys.

EFFECT: method provides increasing of working layer height of elements, and also receiving in the element defined content of abrasive grains for optimal external environment.

12 cl, 1 dwg, 5 ex

FIELD: metallurgy.

SUBSTANCE: there are used powders of super-hard materials of at least two granularities. Also, porous base of the element is made of powders of super-hard materials of higher granularity. Porous base is placed in a bath with suspension containing powders of small granularity and these powders are settled in pores of porous base with electric current transmitted through suspension, where upon all grains of super-hard material are bound with binding.

EFFECT: utilisation of powders of super-hard materials of small granularity including nano dimensions for fabrication of cutting elements with uniform distribution of grains in volume; reduced time of process.

4 cl

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat-resistant polycrystalline diamond composites for production of cutting elements. On the boundary of division on the substrate of ceramic material, metal or cermet applied is heat-resistant diamond plate, which contains a layer of first impregnating material, selected from VIII group of periodic system of chemical elements or eutectic composition of said elements and placed between lower surface of said heat-resistant diamond plate and upper surface of said substrate. Material of coating from boron nitride, graphite or aluminium oxide is applied on the surface of said diamond plate, except the surface on the boundary of division. After that, applied on each other heat-resistant diamond plate and substrate are subjected to thermal cycle, consisting of heating, temperature support and cooling, ensuring transition of, at least, part of said impregnating material into liquid state for migration into heat-resistant diamond plate and into said substrate in the area of the boundary of division for their connection to each other. Said first impregnating material is used in amount, ensuring, at least, 90% of its transition into material of said substrate and plate.

EFFECT: production of working elements of metal-processing instrument, external part of which possesses high hardness, with internal one possessing high shock viscosity, is ensured.

41 cl, 10 dwg

Pcd diamond // 2522028

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

FIELD: process engineering.

SUBSTANCE: invention relates to production of cutters from cemented carbide with superhard tips for destruction of hard and abrasive materials. Cutter (100) comprises insert (110) including superhard tip (112) jointed with support body (114) from cemented carbide with stem (118) and steel holder (120) for said insert (110). Steel holder (120) comprises shaft (122) for connection with tool arbour (not shown) and channel (126) to accommodate stem (118). Said stem fits in said channel through at least 4 cm. Volume of support body (114) from cemented carbide makes at least 10 cm3. Stem surface area adjoins the channel surface inner area making at least 20 cm3 while stem diameter making at least 1.5 cm and not over 4.0 cm. Cutter stem is fitted in steel holder channel with interference fit of 0.002-0.3%.

EFFECT: higher tool hardness, longer life.

13 cl, 11 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to polycrystalline diamond for use in a variety of instruments. Polycrystalline diamond is characterized in that it comprises a sintered diamond grains having an average grain diameter of more than 50 nm and less than 2500 nm, the purity of 99 % or more and the grain diameter of D90, is (average grain diameter + average grain diameter of × 0.9) or less, wherein the polycrystalline diamond has a lamellar structure and has a hardness of 100 GPa or more.

EFFECT: water jet nozzle cutter for engraving gravure scriber, cutting tool and scribing clip from such material ensures stable processing over a long period of time as compared with conventional tools comprising monocrystalline diamond and the sintered diamond compact containing metal binders.

13 cl, 5 tbl, 62 ex

FIELD: abrasive working, possibly manufacture of tools for grinding and polishing parts with curvilinear convex surfaces.

SUBSTANCE: tool includes body mounted on axle and abrasive member. Tool body is in the form of sleeves mutually joined along periphery of their flanges by means of rigid movable rods. Said sleeves have different-hand thread on inner and outer diameters. Such design allows control curvature radius of working surface of abrasive member at rotating sleeves.

EFFECT: enlarged manufacturing possibilities of easy-to-use tool.

4 dwg

FIELD: machine engineering, possibly manufacture of tools for mechanical working, namely cutting metals, removing slag, corrosion products, scale of rolling process, burrs in milling, multi-position and multi-operation machine tools.

SUBSTANCE: method is realized with use of tool having built-up grinding disc and face milling needle. Tool is subjected to rotation and feed motion along ground surface; blank is driven to reciprocation motion. Disc and milling needle are mounted on coaxial rotating separately in different directions hollow and central shafts. Disc includes abrasive-diamond annular segments secured to metallic plates, tore-shaped hollow elastic envelope secured to boss and ring.

EFFECT: enlarged manufacturing possibilities, enhanced efficiency and quality of grinding, restoration of initial position of grinding disc face relative to cutting end of milling needle, possibility of burning-free intermittent grinding.

4 cl, 10 dwg

Up!