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Functionally Gradient Sic Coatings Produced by Chemical Vapor Reaction

Published online by Cambridge University Press:  15 February 2011

W. Kowbel ,
C. Bruce ,
J. C. Withers  and
P. O. Ransone
W. Kowbel
Affiliation:
MER Corp., Tucson, AZ
C. Bruce
Affiliation:
MER Corp., Tucson, AZ
J. C. Withers
Affiliation:
MER Corp., Tucson, AZ
P. O. Ransone
Affiliation:
NASA LaRC, Hampton, VA
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Abstract

Functionally gradient coatings have the potential to eliminate sharp interfaces between the coating layer and substrate resulting in a great ability to tailor the thermo-mechanical properties of the coating systems to a variety of substrates. Primary examples of beneficial use of the functionally gradient materials are the crack free CVD C-SiC coatings that were recently produced by a number of researchers on C-C composites. Inherent limitations of the CVD technique make it practically difficult to obtain high deposition rates on very complex and large shapes combined with good coating uniformity. A new process termed Chemical Vapor Reaction (CVR) has been employed to produce virtually crack free SiC coatings on 2–D C–C composites. Properties of this new class of functionally gradient coatings will be presented and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 363 , 1994 , 251
Copyright
Copyright © Materials Research Society 1995

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