Compositions: ceramic – Ceramic compositions – Refractory
Patent
1985-04-01
1988-08-02
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 88, 501 97, C04B 3552, C04B 3558
Patent
active
047613890
ABSTRACT:
A process for preparing ceramic materials with reduced carbon levels is described. The process involves treating a silicon-containing preceramic polymer with ammonia at a temperature of 550.degree.-800.degree. C. for a time sufficient to reduce the carbon content prior to pyrolysis at 900.degree.-1500.degree. C. Another process also involves the pyrolysis of a silicon-containing preceramic polymer in an ammonia atmosphere. The carbon level of ceramic materials produced by this invention can be controlled to a given, desired level by varying the process conditions. Suitable silicon-containing preceramic polymers include polycarbosilanes, polysilazanes, polysilanes, organosilsesquioxane-containing sol-gels, and organopolysiloxanes which are capable of being converted to ceramic materials when fired to elevated temperatures. Ceramic fibers can be prepared by the processes disclosed which contain less than 0.25 weight percent carbon.
REFERENCES:
patent: 4336215 (1982-06-01), Yajima et al.
patent: 4405589 (1983-09-01), Iwai et al.
patent: 4517168 (1985-05-01), Kawahito et al.
Bujalski Duane R.
Rabe James A.
Bell Mark L.
Dow Corning Corporation
Group Karl
McKellar Robert L.
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