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Repair of oxidation protection coatings on carbon-carbon using preceramic polymersThe paper describes a field-applicable technique for the repair of damage to SiC protective coatings on carbon/carbon composites, using commercial preceramic polymers, such as perhydropolysilazane developed by the Southwest Research Institute and several commercial polymers (NICALON, PS110, PS116, PS117, NCP-200, and PHPS were tested). After being applied on the damaged panel and oxidized at 1400 C, these polymers form either SiC or Si3N4 (or a mixture of both). It was found that impact damaged carbon/carbon specimens repaired with perhydropolysilazane exhibit substantial oxidation resistance. Many of the other tested preceramic polymer were found to be unsuitable for the purpose of repair due to either low ceramic yield, foaming, or intumescence.
Document ID
19930069951
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Schwab, Stuart T.
(NASA Headquarters Washington, DC United States)
Graef, Renee C.
(Southwest Research Inst. San Antonio, TX, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Damage and oxidation protection in high temperature composites. Vol. 1; Proceedings of the Symposium, 112th ASME Winter Annual Meeting, Atlanta, GA, Dec. 1-6, 1991 (A93-53937 23-24)
Publisher: American Society of Mechanical Engineers
Subject Category
Composite Materials
Accession Number
93A53948
Distribution Limits
Public
Copyright
Other

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