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A method of making a shaped article and composite therefor which comprises of a shaped tool, such as a mold and providing a composite of a quartz fabric disposed within a resin taken from the class consisting of inorganic silicon-based polymers, preferably polycarbosilanes having predominantly hydro

A method of making a shaped article and composite therefor which comprises of a shaped tool, such as a mold and providing a composite of a quartz fabric disposed within a resin taken from the class consisting of inorganic silicon-based polymers, preferably polycarbosilanes having predominantly hydrogen and/or methyl groupings attached thereto and polysilanes having hydrogen and/or methyl grouping attached thereto, polycarbosilazanes, polyborosilazanes, polyborosilanes and certain polysiloxanes with attached groupings as noted for the similar materials as set forth above, which is moldable at a temperature below the curing temperature of the resin and cured by catalyst. The resin can be optionally filled with particulate material. A compaction pressure is applied to the composite to insure contact of the composite and the tool and prevent loss of less reactive resin components. The composite is then cured to hardness by increasing the temperature applied to the composite at a rate of about 10.degree. C./minute to a temperature of about 150.degree. C. and holding that temperature of about 150.degree. C. up to about 4 hours to provide a cured polymer. The cured composite is removed from the tool. The polymer can then be converted to a preceramic by heating the cured polymer to a temperature sufficiently high in an inert atmosphere or ammonia gas for a sufficient time. The removal of carbon will occur when processed in ammonia The preceramic can then be reprocessed by repeating the above procedure after cooling and reinfiltrating with uncured resin.

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[ I claim:] [1.] A method of making a shaped article which comprises the steps of:(a) providing a shaped tool;(b) providing a composite of quartz fibers disposed within a resin selected from the class consisting of inorganic silicon-based polymers, polysilanes, polyborosilazanes, polyborosilanes and

[ I claim:] [1.] A method of making a shaped article which comprises the steps of:(a) providing a shaped tool;(b) providing a composite of quartz fibers disposed within a resin selected from the class consisting of inorganic silicon-based polymers, polysilanes, polyborosilazanes, polyborosilanes and polysiloxanes, wherein each resin has only hydrogen and/or methyl groupings attached thereto, which is moldable at a temperature below the curing temperature of said resin and will provide no more than about 0.5 percent by weight of said composite of free carbon when cured;(c) applying a pressure to said composite to insure contact of said composite and said tool;(d) curing said composite to provide a hardened shaped article having no more than about 0.5 percent by weight of said composite of free carbon; and(e)removing said cured hardened shaped article from said tool.