MANUFACTURE OF HEXAGONAL BORON NITRIDE

摘要

Process for the manufacture of hexagonal boron nitride which comprises causing a starting material containing an alkali metal boride or an alkaline earth metal boride, preferably a hexa-or dodecaboride, to react with nitrogen at temperatures of at least 900.degree.C and if desired up to 2500.degree.C. The process is promoted by impurities or additives of other boron compounds or compounds of the alkaline or alkaline earth metals being present in the starting materials. Boron nitride has many uses in various fields, among them electronics and crucible melting for most non metallic melts.