NDLI: Method for waterproofing ceramic materials

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Method for waterproofing ceramic materials

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1998
Description	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 times its weight of water, absorbs less than 10 wt. % water after being waterproofed according to the method of the invention.
File Size	782793
Page Count	7
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19990008546
Archival Resource Key	ark:/13960/t0rr6sc5b
Language	English
Publisher Date	1998-09-29
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Silanes Patents Insulation Pyrolysis Hygroscopicity Siloxanes Inventions Reentry Vehicles Combustion Ceramics Coatings Vapor Deposition Technology Assessment Proving Silicon Porosity Waterproofing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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