Polysilazanes, processes for their preparation, ceramic material

Details Polysilazanes, processes for their preparation, ceramic material Polysilazanes, processes for their preparation, ceramic material

1988-12-02

1990-08-07

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 28, 528 38, 264 56, 501 97, 427226, C08G 7704

Patent

active

049469207

ABSTRACT:
The invention relates to novel polysilazanes, their preparation, their further processing to ceramic material containing silicon nitride and this material itself. To prepare the polysilazanes, Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazanes of the formula RSiCl.sub.2 -NR'-SiCl.sub.2 R are reacted with ammonia. The polysilazanes can then be pyrolyzed to ceramic material containing silicon nitride. The polysilazanes according to the invention dissolve in the customary aprotic solvents.

REFERENCES:
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patent: 4404153 (1983-09-01), Gaul, Jr.
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4535007 (1985-08-01), Cannady
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patent: 4595775 (1986-06-01), Arkles
patent: 4725660 (1988-02-01), Serita et al.
patent: 4835238 (1989-05-01), Burns
R. R. Wills et al., Ceramic Bulletin, 62, 904-915 (1983).

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