Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1995-09-13
1998-09-29
Kiliman, Leszek
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
4283073, 4283077, 4283126, 428336, 428447, 428698, 428704, 428920, 244133, 427226, 4272553, 427244, 427245, 442 79, 442 81, 442 86, 442 87, B64C 140, B32B 518, B32B 1800
Patent
active
058143971
ABSTRACT:
Hygroscopic ceramic materials which are difficult to waterproof with a silane, substituted silane or silazane waterproofing agent, such as an alumina containing, fibrous, flexible and porous, fibrous ceramic insulation used on a reentry space vehicle, are rendered easy to waterproof if the interior, porous surface of the ceramic is first coated with a thin coating of silica. The silica coating is achieved by coating the interior surface of the ceramic with a silica precursor, converting the precursor to silica either in-situ or by oxidative pyrolysis and then applying the waterproofing agent to the silica coated ceramic. The silica precursor comprises almost any suitable silicon containing material such as a silane, silicone, siloxane, silazane and the like applied by solution, vapor deposition and the like. If the waterproofing is removed by, e.g., burning, the silica remains and the ceramic is easily rewaterproofed. An alumina containing TABI insulation which absorbs more that five timed its weight of water, absorbs less than 10 wt. % water after being waterproofed according to the method of the invention.
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Cagliostro Domenick E.
Hsu Ming-Ta S.
Bon Kathleen Dal
Kiliman Leszek
Lupuloff Harry
Mannix John G.
Tarazano D. Lawrence
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