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Formation mechanism of a silicon carbide coating for a reinforced carbon-carbon compositeResults are presented for a study to determine the mechanisms involved in a high-temperature pack cementation process which provides a silicon carbide coating on a carbon-carbon composite. The process and materials used are physically and chemically analyzed. Possible reactions are evaluated using the results of these analytical data. The coating is believed to develop in two stages. The first is a liquid controlled phase process in which silicon carbide is formed due to reactions between molten silicon metal and the carbon. The second stage is a vapor transport controlled reaction in which silicon vapors react with the carbon. There is very little volume change associated with the coating process. The original thickness changes by less than 0.7%. This indicates that the coating process is one of reactive penetration. The coating thickness can be increased or decreased by varying the furnace cycle process time and/or temperature to provide a wide range of coating thicknesses.
Document ID
19760032209
Document Type
Conference Proceedings
Authors
Rogers, D. C. (LTV Aerospace Corp. Dallas, TX, United States)
Shuford, D. M. (LTV Aerospace Corp. Dallas, TX, United States)
Mueller, J. I. (LTV Aerospace Corp. Vought Systems Div., Dallas, Tex., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
COMPOSITE MATERIALS
Meeting Information
Materials review ''75(Albuquerque, NM)
Distribution Limits
Public
Copyright
Other