The production of boron nitride fibres from borylborazines

摘要

The present invention relates to a process for the production of boron nitride fibres, in particular of continuous fibers of boron nitride having good mechanical properties, which can be used for the production of composite ceramic materials such as composites bn / bn, the parts of thermostructural or radomes antennes.elle supplies and uses a precursor polymer of formula (i) below: in which n is an integer, r1 and r2, which are identical or different, represent, independently, an alkyl group, and r3 represents an amino group, a hydrogen atom, an alkyl, cycloalkyl or a boryl.