Porous free standing pyrolytic boron nitride articles and method for preparing the same.

摘要

The invention deals with porous free standing pyrolytic boron nitride articles and a method for preparing the same.
<??>A sponge-like free-standing pyrolytic boron article is made by reacting ammonia and gaseous boron halide diluted with an inert gas to deposit pyrolytic boron nitride on a porous substrate such as open-pored vitreous carbon under a vacuum and then removing the substrate as by oxidation.