Silicon nitride ceramics from isocyanate- and isothiocyanate-mod

Details Silicon nitride ceramics from isocyanate- and isothiocyanate-mod Silicon nitride ceramics from isocyanate- and isothiocyanate-mod

1990-02-20

1991-03-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

264 65, C04B 3556, C04B 3558

Patent

active

050010905

ABSTRACT:
Polysilazane addition polymers are prepared by (1) reacting ammonia with one or more halogenated organic silicon compounds to produce a cyclic silazane ammonolysis product and (2) reacting the ammonolysis product with from 0.1% to 30% by weight of an isocyanate, isothiocyanate, ketene, thioketene, carbodiimide, or carbon disulfide. Polysilazane addition polymers containing alkenyl or alkynyl groups can be cured by supplying energy to generate free radicals. The cured or uncured polymers can be pyrolyzed to produce silicon nitride-containing ceramic materials.

REFERENCES:
patent: 4535007 (1985-08-01), Cannady
patent: 4818611 (1989-04-01), Arai et al.

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