Stock material or miscellaneous articles – Self-sustaining carbon mass or layer with impregnant or...
Patent
1985-04-08
1987-06-09
Swisher, Nancy A.
Stock material or miscellaneous articles
Self-sustaining carbon mass or layer with impregnant or...
428698, 428446, 428902, B32B 900, B32B 1900
Patent
active
046719970
ABSTRACT:
Gas turbine engine carbon-carbon composite components having multilayer coatings resulting in components resistant to oxidation at temperatures greater than 2500.degree. F. A first multilayer coating comprises a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride. A second multilayer coating comprises a layer of pyrolytic graphite covered with a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride. The third multilayer coating comprises a layer of chemical vapor deposition applied silicon carbide covered with a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride. Carbon fibers are carbonized or graphitized, formed into woven structures which are stacked in a prepreg with impregnating resin, pyrolyzed and optionally graphitized to form an engine component, and then coated with the above-described layers to achieve an engine component highly resistant to oxidation at elevated temperatures.
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Galasso Francis S.
Veltri Richard D.
Olson A. Dean
Swisher Nancy A.
United Technologies Corporation
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