Conversion of polycarbosilanes into silicon nitride ceramics

Details Conversion of polycarbosilanes into silicon nitride ceramics Conversion of polycarbosilanes into silicon nitride ceramics

1989-11-27

1991-07-02

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, C04B 3558

Patent

active

050285718

ABSTRACT:
Silicon nitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .dbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, and then (b) pyrolyzing the infusible polycarbosilane which results under an ammonia atmosphere.

REFERENCES:
patent: 4650773 (1987-03-01), Okamura et al.
patent: 4743662 (1988-05-01), Lipowitz
patent: 4761389 (1988-08-01), Rabe et al.
Composites, vol. 18, No. 2, Apr. 1987, pp. 107-120, Butterworth & Co. Ltd., Guildford, Surrey, GB, K. Okamura, "Ceramic Fibres from Polymer Precursors".

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