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| The patent fortfolio includes applications of silicon oxycarbide black glass on (A) producing fiber, (B) ceramic matrix composites, and (C) as an oxidative-resistant coating on carbon-carbon composite. The empirical formula of the silicon oxycarbide is SiC.sub.x O.sub.y where x ranges from about 0.5 to about 2.0 and y ranges from about 0.5 to about 3.0. Synthesis involves reacting a silicon hydride group with a silicon olefinic group in the presence of a hydrosilylation catalyst to give a cyclosiloxane polymer. The polymer is then pyrolyzed at temperature between 600C and 1350C to give a black glass. (A) This invention relates to a black glass fiber which is resistant to oxidation at a temperature of about 1350.degree. C. The cyclosiloxane polymer is gel spun into fiber, hardened and then pyrolyzed to give a black glass fiber. (US 5629249) (B) An improved fiber reinforced glass composite includes a refractory or carbon fiber in a matrix of a black glass ceramic. Graceful failure can be obtained when the carbon fibers are highly graphitized. (US 5486250; 5464594; 5486251; 5587345) (C) A process for forming a high-temperature oxidation-resistant coating on a carbon-carbon composite is disclosed and claimed. The process comprises applying a cyclosiloxane polymer blending with a filler such as silicon carbide to a carbon-carbon composite, polymerizing and pyrolyzing said blend to form a filled black glass protective coating on the carbon-carbon composite. (US 5225283) Another process of preparing an oxidation resistant black glass having the empirical formula SiC.sub.x O.sub.y, wherein 0<x.ltoreq.2.0 and 0<y.ltoreq.2.2 is claimed. The process comprises reacting cyclosiloxane monomers to effect the bonding of one vinyl carbon atom to a silicon, curing the product at not greater than 250.degree. C., and pyrolyzing at about 800.degree.-1400.degree. C. in an atmosphere containing a sufficient amount of oxygen to reduce carbon content. (US 5231059) |
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