Polymeric ethylene-bridged chlorosilazanes, process for their pr

Details Polymeric ethylene-bridged chlorosilazanes, process for their pr Polymeric ethylene-bridged chlorosilazanes, process for their pr

1989-11-30

1991-04-30

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, 501 95, C04B 3546, C04B 3548

Patent

active

050118013

ABSTRACT:
Polymeric ethylene-bridged chlorosilazanes, process for their preparation, ceramic materials which can be prepared from them containing silicon nitride, and their preparation
The invention relates to novel polymeric ethylene-bridged chlorosilazanes, their preparation, their further processing to a ceramic material containing silicon nitride, and this material itself. In order to prepare the polymeric chlorosilazanes, oligosilazanes of the formula (I) ##STR1## are reacted with at least one of the chlorosilanes ##STR2## in which R.sup.1 to R.sup.5 are C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl groups, which may be identical or different.
The polymeric chlorosilazanes according to the invention can be converted by reaction with ammonia into polysilazanes, which in their turn can be pyrolysed to ceramic materials containing silicon nitride.

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patent: 4689252 (1987-08-01), Lebron et al.
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Andrianov, K. A. et al., Consultants Bureau, 1822-1824 (1974) (Engl. transl. of Izv. Akad. Nauk SSSR, Ser. Khim. 1973(8), 1878).
Wills, R. R. et al., Ceramic Bulletin 62:904-915 (1983).

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