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AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsDemetrius A. Kourtides, Rex A. Churchward, David M. Lowe
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A protective coating for ceramic materials such as those made of silicon carbide, aluminum oxide, zirconium oxide, aluminoborosilicate and silicon dioxide, and a thermal control structure comprising a ceramic material having coated thereon the protective coating. The protective coating contains, in admixture, silicon dioxide powder, colloidal silicon dioxide, water, and one or more emittance agents selected from silicon tetraboride, silicon hexaboride, silicon carbide, molybdenum disilicide, tungsten disilicide and zirconium diboride. In another aspect, the protective coating is coated on a flexible ceramic fabric which is the outer cover of a composite insulation. In yet another aspect, a metallic foil is bonded to the outer surface of a ceramic fabric outer cover of a composite insulation via the protective coating. A primary application of this invention is as a protective coating for ceramic materials used in a heat shield for space vehicles subjected to very high aeroconvective heating environments.
A protective coating for a ceramic material comprising, in admixture, silicon dioxide power in an amount of from 23.0 to 44.0 wt %;
A thermal control structure comprising a ceramic material having coated thereon a protective coating comprising, in admixture, silicon dioxide powder in an amount of from 23.0 to 44.0 wt %;
A thermal control structure comprising a composite insulation comprising a ceramic fabric outer covering having coated on the outer surface of the ceramic fabric a protective coating comprising, in admixture, silicon dioxide powder in an amount of from 23.0 to 44.0 wt %;
Dependencies are inferred from the claim text.