Novel materials based on boron nitride, their preparation and their use as reinforcing agents

摘要

The invention relates to a new material based on boron nitride, characterized in that it has a shape that is essentially fibrillar. / p & & p & the method of preparation of such a material is characterized by the fact that is reacted in a bath of molten salts at least a nitride of alkali metal or alkaline-earth - metal with at least one boron compound capable of being converted into boron nitride by said nitride of alkali metal or alkaline-earth - metal in the bath of molten salts. / p & & p & the product according to the invention finds an application as reinforcing agent of composite materials.