PROCESS FOR THE MANUFACTURE OF BORON NITRIDE FIBERS FROM BORYLBORAZINES

摘要

P The present invention relates to a process for manufacturing boron nitride fibers, in particular continuous fibers of boron nitride having good mechanical properties, usable for the production of ceramic composite materials such as BN / BN composites , thermostructural parts or antenna radomes. It supplies and uses a precursor polymer of formula (I) below: in which n is an integer, R1 and R2, identical or different, independently represent an alkyl group, and R3 represents an amino group, a hydrogen atom, an alkyl, a cycloalkyl or a boryl. / P