SILAZANE POLYMER CONTAINING SICL GROUP, ITS MANUFACTURE, CERAMIC RAW MATERIAL WHICH CONTAINS SILICON NITRIDE AND CAN BE MADE THEREFROM, AND MANUFACTURE OF THIS MATERIAL

摘要

The invention relates to novel silazane polymers containing SiCl groups, to their preparation, to their conversion into silicon nitride-containing ceramic material, and to this material itself. In order to prepare the silazane polymers containing SiCl groups, alpha , omega -chlorosilazanes of the formula I (I) in which m has a value of from 1 to 12 and -(Si) is a silyl radical of the formula -SiHR1Cl, -SiR2R3Cl, -SiR4Cl2, -SiR5Cl-CH2CH2-SiR5Cl2 or -SiCl2-CH2CH2-SiR6Cl2, and R is C1-C6-alkyl or C2-C6-alkenyl and, independently of one another, R1-R6 are H, C1-C6-alkyl or C2-C6-alkenyl, to a temperature of from 100 DEG C. to 400 DEG C. The silazane polymers according to the invention containing in SiCl groups can be reacted with ammonia to give polysilazanes, which can themselves be pyrolyzed to give silicon nitride-containing ceramic materials.