SE372495

SE372495

1335909 Cubic boron nitride VSESOJUZNY NAUCHNO - ISSLEDOVATELSKY INSTITUT ABRAZIVOV I SHLIFOVANIA 19 April 1971 [12 Oct 1970] 26259/71 Heading C1A [Also in Division C4] Cubic boron nitride is prepared by subjecting hexagonal boron nitride to at least 1000‹ C. and 40 Kbar in the presence of at least...

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Hauptverfasser: LYSANOV V,SU, KONDAKOV V,SU, SOKHOR M,SU, PAVLOV V,SU, KOVALCHUK J,SU, GOMON G,SU, VARZANOV M,SU, PONOMARENKO V,SU, LOSCHININ V,SU, FILONENKO BORODICH N,SU, DAVIDENKO V,SU, DIGONSKY V,SU, RYBAKOV V,SU, IVANOV V,SU, FELDGUN L,SU, EFROS M,SU
Format: Patent
Sprache:eng
Schlagworte:
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS THEREOF
CONCRETE
INORGANIC CHEMISTRY
LIME, MAGNESIA
METALLURGY
NON-METALLIC ELEMENTS
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Zusammenfassung:1335909 Cubic boron nitride VSESOJUZNY NAUCHNO - ISSLEDOVATELSKY INSTITUT ABRAZIVOV I SHLIFOVANIA 19 April 1971 [12 Oct 1970] 26259/71 Heading C1A [Also in Division C4] Cubic boron nitride is prepared by subjecting hexagonal boron nitride to at least 1000‹ C. and 40 Kbar in the presence of at least one boride of an alkali and/or alkaline earth metal which is present in such a quantity as to increase the boron content in the reactants by at least 10%. Suitable borides are Hg or Be borides which may be present in such quantity as to increase the boron content by 20-55%. The reaction mixture may be preheated to at least 1000‹ C. and cooled before being subjected to the reaction conditions. An abrasive product of the process contains 90-98% cubic boron nitride, not more than 9% unhydrolysable borides, nitrides and free boron, and not more than 1% hexagonal boron nitride with at least 80% of the abrasive material in the form of grains of polycrystalline aggregates.