Abrasive cubic boron nitride - from hexagonal boron nitride using metal borides

Abrasive cubic boron nitride - from hexagonal boron nitride using metal borides

Initiator consisting of alkali(ne earth) metal boride, pref. Mg- or Be boride, promotes conversion of hexagonal to cubic BN above 1000 degrees C and 40 kbar press. B content of initiator, calc. as elemental B, is such as to raise total B content of reaction mixt. by >=10% w.r.t. stoichiometric co...

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Hauptverfasser: V.A. RYBAKOV, V.A. PONOMARENKO, V.B. LOSCHININ, V.M. DAVIDENKO, M.I. SOKHOR, M.G. EFROS, V.V. DIGONSKY, V.I. IVANOV, N.E. FILONENKO-BORODICH, V.S. LYSANOV, V.S. PAVLOV, V.G. KONDAKOV, G.O. GOMON, M.A. VARZANOV, L.I. FELDGUN, J.M. KOVALCHUK
Format: Patent
Sprache:eng ; fre
Schlagworte:
ADHESIVES
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS THEREOF
CONCRETE
DYES
INORGANIC CHEMISTRY
LIME, MAGNESIA
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
NON-METALLIC ELEMENTS
PAINTS
POLISHES
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:Initiator consisting of alkali(ne earth) metal boride, pref. Mg- or Be boride, promotes conversion of hexagonal to cubic BN above 1000 degrees C and 40 kbar press. B content of initiator, calc. as elemental B, is such as to raise total B content of reaction mixt. by >=10% w.r.t. stoichiometric content in hexagonal BN. Pref. hexagonal BN and initiator mixt. is pre-heated to >=1000 degrees C to form an alloy, which is cooled and used as reaction mixt. Abrasive prod. pref. contains 90 - 98% cubc BN, =9% non-hydrolysable borides, nitrides and free B and consists of >=80% polycrystalline granular aggregates. It is useful for grinding tools, e.g. wheels, -stone, -cloth, abrasive paper and emergy pastes and withsands moisture.