Method for repairing a multilayer coating on a carbon-carbon com

Details Method for repairing a multilayer coating on a carbon-carbon com Method for repairing a multilayer coating on a carbon-carbon com

1985-04-08

1986-09-09

Childs, Sadie L.

Coating processes

Restoring or repairing

427249, 4272552, 4274197, B32B 3500

Patent

active

046108963

ABSTRACT:
A method for repairing a multilayer coating on a carbon-carbon composite having a CVD silicon nitride outercoating by applying a coating of CVD silicon nitride. It has been found that if a multilayer coating containing CVD silicon nitride on a carbon-carbon composite is broken the entire composite will fail to survive at elevated temperatures due to oxidation. However, the deposition of silicon nitride on such a composite will affect repair such that the newly coated composite will substantially resist oxidation at temperatures up to 1750.degree. C. and above. Preferably the coated composite is maintained at a temperature of about 1500.degree. C. and a gaseous mixture containing silicon tetrafluoride and anhydrous ammonia is passed over the composite at a partial pressure of the reactant gases less than about 10 millimeters mercury.

REFERENCES:
patent: 3798061 (1974-03-01), Yamazaki
patent: 4472476 (1984-09-01), Veltri et al.
patent: 4501777 (1985-02-01), Rose

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