| 摘要 |
HOE 88/F 341 Polymeric chlorosilazanes, process for their preparation, ceramic materials containing silicon nitride which can be manufactured therefrom, and their manufacture The invention relates to novel polymeric chlorosilazanes, to their preparation, to their processing to form ceramic material containing silicon nitride, and to said material itself. The polymeric chlorosilazanes are prepared by reacting a mixture of oligosilazanes of formula (I) (I) in which n is about 2 to about 12, and oligosilazanes of formula (II), (RSiHNH)m, in which m is about 3 to about 12, with at least one of the chlorosilanes Cl2R2Si-CH2-CH2-SiR2Cl2, Cl3Si-CH2-CH2-SiR3Cl2, R4SiCl3 or R5SiHCl2 at 30.degree.C to 300.degree.C, where R and R1 to R5 are C1-C6 alkyl or C2-C6 alkenyl groups which can be identical or different. The polymeric chlorosilazanes according to the invention can be converted into polysilazanes by reaction with ammonia, and these in turn can be pyrolyzed to form ceramic materials containing silicon nitride.
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