USAGE OF POLYMER BASED ON BORON AND NITROGEN AS PRECURSOR FOR CERAMICS CHIEFLY MADE OF BORON NITRIDE AND ITS CERAMIC PRODUCT

摘要

Polymers based on boron and nitrogen, which are precursors of boron nitride, are obtained by the addition of at least one trihaloborane to a molar excess of at least one silazane compound containing at least one IDENTICAL Si-NH-Si IDENTICAL group. The trihaloborane may be run into the reactor at the same time as the silazane compound or onto a silazane base stock. The reaction may be carried out at room temperature. The invention relates to the use of the polymers obtained for obtaining boron nitride-based ceramics by pyrolysis of these polymers at a temperature of between 1000 DEG C and 2000 DEG C.