Production of ceramic materials by pyrolysis of highly crosslinked polymeric carbodiimides

摘要

The invention concerns a process for producing ceramic materials by pyrolysis of a polymer ceramic precursor. The ceramic precursor is produced by (a) reacting halides of elements selected from groups IIIA, IVA and VA of the periodic system, transition metals and rare-earth elements with a compound of the formula (I): R3 Si-N=C=N-SiR3, in which R, independently in each case, means a C1-C3 alkyl or alkenyl group, and (b) separating volatile components from the reaction mixture.