Water-soluble boron containing impurity reduced hexagonally crys

Details Water-soluble boron containing impurity reduced hexagonally crys Water-soluble boron containing impurity reduced hexagonally crys

1987-04-30

1989-08-01

McFarlane, Anthony

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

501 96, 423406, C01B 21064

Patent

active

048531960

ABSTRACT:
A hexagonally crystalline boron nitride containing water-soluble boron containing impurities in such a magnitude that the amount of boron contained in an extract after boiling at 100.degree. C. in pure water is less than or equal to 100 .mu.g per gram of boron nitride. In order to purify the boron nitride, a purification process is carried out according to the steps of preparing fine particles of boron nitride powder; dispersing the boron nitride powder in a dispersion medium and stirred for a given period of time for removing water-soluble boron containing impurities; and drying the boron nitride in atmosphere, in which the vapor pressure is maintained lower than or equal to 10 mmHG and/or the process temperature is maintained lower than or equal to 100.degree. C.

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