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

1989-01-31

1991-03-05

McFarlane, Anthony

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

423406, 501 96, C01B 21064

Patent

active

049976338

ABSTRACT:
A hexagonally crystalline boron nitride containing water-soluble boron containing impurity in such a magnitude that amount of boron to be contained in an extract after boiling at 100.degree. C. of pure water is less than or equal to 100 .mu.g/g-BN. 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 disperser and stirred for a given period of time for removing water-soluble boron containing impurity; and drying the boron nitride in an atmosphere, in which 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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