PROCESS FOR PRODUCING SHAPED BORON NITRIDE PRODUCT

摘要

of the disclosure A process for the production of boron nitride is carried out by condensing a mixture of a B-tris- (loweralkylamino)borazine with an alkylamine in an inert gas atmosphere at a temperature of 150.degree.C or above to prepare a precursor, forming the precursor into a desired shape and then slowly heating the shaped precursor in an ammonia gas atmosphere until the precursor changes to a white boron nitride product. The shaped boron nitride in a form of fiber is particularly useful as a reinforcement.