Conversion of polycarbosilanes into silicon carbonitride ceramic

Details Conversion of polycarbosilanes into silicon carbonitride ceramic Conversion of polycarbosilanes into silicon carbonitride ceramic

1989-11-27

1991-09-17

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, C04B 3558

Patent

active

050495291

ABSTRACT:
Silicon carbonitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .tbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, next (b) heat treating the infusible polycarbosilane which results under an ammonia atmosphere to such extent as to introduce nitrogen into the infusible polycarbosilane without completely removing the carbon therefrom, and then (c) heat treating the nitrogenated polycarbosilane in a vacuum or in an inert atmosphere to such extent as to essentially completely convert it into a ceramic silicon carbonitride.

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

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