POLYCRYSTALLINE SUPERHARD MATERIAL

The proposed polycrystalline superhard material comprises sintered particles of cubic boron nitride coated over the whole surface thereof with a layer of a crystalline compound of the chemical formula BxNyCz, where x, y and z can assume any value from 0 to 1, said compound binding together the parti...

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Bibliographische Detailangaben
Hauptverfasser:	GARASIMENKO V.K, NIKITIN J.I, VARNIN V.P, BAKUL V.N, POLTORATSKY V.G, DERYAGIN B.V, FEDESEEV D.V, PRIKHNA A.I, VNUKOV S.P
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS THEREOF CONCRETE CRYSTAL GROWTH GRINDING INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS POLISHING PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL REFRACTORIES SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH SLAG TOOLS FOR GRINDING, BUFFING, OR SHARPENING TRANSPORTING TREATMENT OF NATURAL STONE UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	The proposed polycrystalline superhard material comprises sintered particles of cubic boron nitride coated over the whole surface thereof with a layer of a crystalline compound of the chemical formula BxNyCz, where x, y and z can assume any value from 0 to 1, said compound binding together the particles of the cubic boron nitride. According to the present invention the proposed material is produced in the following way: particles of cubic boron nitride are placed in a flow of a gas containing carbon for a carbon layer 1-100 A thick to be built up on the whole surface of said particles. Then the particles of cubic boron nitride with the carbon layer built up over the whole surface of the particles are subjected to sintering at a temperature and under a pressure corresponding to the region of thermodynamic stability of cubic boron nitride. The herein-proposed material is highly uniform and features mechanical properties superior to those of the known cubic boron nitride materials. Thus, for example, under the identical conditions of cutting, durability of cutters made from the proposed material is 2-5 times higher than that of the cutters made from the known material based on cubic boron nitride.