Method for producing large soft hexagonal boron nitride particle

Details Method for producing large soft hexagonal boron nitride particle Method for producing large soft hexagonal boron nitride particle

1976-12-06

1977-08-30

Emery, Stephen J.

Chemistry: physical processes

Physical processes

Crystallization

156624, 156DIG86, 423290, B01D 902, B01J 1704, C01B 3500, C01B 2106

Patent

active

040451860

ABSTRACT:
Soft hexagonal boron nitride crystals of 200-600 microns platelet size are produced from crystals of less than fifty microns particle size by mixing the small crystals with Li.sub.3 N, simultaneously heating and pressurizing said mixture to a temperature and pressure in a restricted region of the graphitic (hexagonal) boron nitride (GBN) stable region of the pressure-temperature (P-T) phase diagram of boron nitride, cooling and depressurizing said mixture, and separating off the water soluble material present in the mixture to leave a residue of large crystals of boron nitride.

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