Composite silicon carbide/silicon nitride coatings for carbon-ca

Details Composite silicon carbide/silicon nitride coatings for carbon-ca Composite silicon carbide/silicon nitride coatings for carbon-ca

1982-06-24

1984-09-18

Ives, Patricia C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428408, 428448, 428450, 428367, 428366, 427249, 427228, 4272556, C23C 1100, C23C 1108

Patent

active

044724764

ABSTRACT:
A multilayer coating system for the protection of carbon-carbon composites is described. The coating includes an inner layer of SiC (produced by a conversion process in which Si is diffused into the carbon substrate) and an outer layer of CVD (chemically vapor deposited) Si.sub.3 N.sub.4. Such a coating provides exceptional oxidation resistance, to 2500.degree. F. (1371.degree. C.) and above, for carbon-carbon materials. Optionally, preliminary coatings of CVD SiC or pyrolytic graphite can be applied prior to application of the inner layer of SiC.

REFERENCES:
patent: 2992127 (1961-07-01), Jones
patent: 3095316 (1963-06-01), Hartwig
patent: 3925577 (1975-12-01), Fatzer
patent: 4029844 (1977-06-01), Olcott
patent: 4142008 (1979-02-01), Debolt
patent: 4214037 (1980-07-01), Galasso et al.

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