Process for preparing cubic boron nitride

Details Process for preparing cubic boron nitride Process for preparing cubic boron nitride

1982-03-03

1983-10-11

Hearn, Brian E.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

423279, C01B 2106

Patent

active

044091931

ABSTRACT:
A process for preparing cubic boron nitride comprises heating hexagonal boron nitride and magnesium boron nitride at a temperature of at least 1350.degree. C. under a pressure at which the cubic boron nitride is thermodynamically stable, whereby the cubic boron having high strength and high purity can readily be obtainable. Also disclosed is a process for the preparation of magnesium boron useful as a starting material for the above process. This process comprises mixing hexagonal boron nitride and magnesium nitride or metal magnesium in a molar ratio of hexagonal boron nitride/magnesium being at least 0.6, and heating the mixture thus obtained, at a temperature of from 950.degree. to 1250.degree. C. under atmospheric pressure in a non-oxidizing atmosphere, e.g. a nitrogen atmosphere.

REFERENCES:
DeVries, R. C. et al., "Journ. Cryst. Growth" 1972, pp. 88-92.
Chem Abst., vol. 93, 1980, 97824c.
Journal of Material Science 14, "Precipitation Mechanism of BN in the Ternary System of B-Mg-N" Tadashi Endo, Osamu Fukunga, Minoru Iwata (1979) 1676-1680.
Journal of Material Science 16 (1981) 2227-2232, "The Synthesis of cBN Using Ca.sub.3 B.sub.2 N.sub.4 ", Tadashi Endo, Osamu Fukunga, Minoru Iwata.

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