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Oxidation resistant slurry coating for carbon-based materialsAn oxidation resistant coating is produced on carbon-base materials, and the same processing step effects an infiltration of the substrate with silicon containing material. The process comprises making a slurry of nickel and silicon powders in a nitrocellulose lacquer, spraying onto the graphite or carbon-carbon substrate, and sintering in vacuum to form a fused coating that wets and covers the surface as well as penetrates into the pores of the substrate. Optimum wetting and infiltration occurs in the range of Ni-60 w/o Si to Ni-90 w/o Si with deposited thicknesses of 25-100 mg/sq. cm. Sintering temperatures of about 1200 C to about 1400 C are used, depending on the melting point of the specific coating composition. The sintered coating results in Ni-Si intermetallic phases and SiC, both of which are highly oxidation resistant.
Document ID
19850026954
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Smialek, J. L. (NASA Lewis Research Center Cleveland, OH, United States)
Rybicki, G. C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
August 13, 1985
Subject Category
Metallic Materials
Accession Number
85N35267
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,535,035|NASA-CASE-LEW-13923-1
Patent Application
US-PATENT-APPL-SN-571617

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