Process for preparing rhombohedral system boron nitride using Na

Details Process for preparing rhombohedral system boron nitride using Na Process for preparing rhombohedral system boron nitride using Na

1984-08-22

1987-12-22

Doll, John

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

501 96, C01B 21064

Patent

active

047145994

ABSTRACT:
A process for preparing rhombohedral system boron nitride, which comprises mixing NaBH.sub.4 with at least an equimolar amount of NH.sub.4 Cl, and heating the resulting mixture in a non-oxidizing atmosphere at a temperature of at least 750.degree. C. and lower than 1000.degree. C. for at least 3 hours.

REFERENCES:
patent: 4064225 (1977-12-01), Chew et al.
patent: 4468263 (1984-08-01), Artz et al.
H. Sumiya et al, "High Pressure Synthesis of Cubic Boron Nitride from Amorphous State", Mat. Res. Bull. vol. 18, pp. 1203-1207 (1983).
Research Report No. 27 by National Institute for Researches in Inorganic Materials, 1981, "Study on Boron Nitride" Sections 2.1.2, 2.1.3 (part).

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