Conversion coating on carbon/carbon composites with controlled microstructure
AssigneeLoral Vought Systems Corporation
InventorsRoy E. Booth, David M. Shuford, John S. Linck
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Abstract
The invention provides a composition of matter comprising silicon, silicon carbide and boron carbide as a coating for protecting carbon substrates from degradation at elevated temperatures. The invention also provides a method for forming a protective coating on carbon substrates by utilizing the aforesaid composition of matter.
Claims27
A method for forming a coating on a carbon substrate for protecting the substrate from degradation at elevated temperatures, comprising:
- (a) forming a first mixture consisting essentially of silicon particulates and silicon carbide particulates;
- (b) contacting a surface of said substrate with said first mixture;
- (c) heating said surface of said substrate and the thus contacting first mixture under suitable reaction conditions to form a first coating on said surface of said substrate;
- (d) cooling the thus coated substrate surface;
- (e) forming a second mixture comprising boron particulates, silicon carbide particulates, and silicon particulates;
- (f) contacting said thus coated substrate surface with said second mixture;
- and
- (g) heating said thus coated substrate surface and the thus contacting second mixture under suitable reaction conditions to form a microstructure coating on said surface of said substrate.
A method for forming a coating on a carbon substrate for protecting the substrate from degradation at elevated temperatures, comprising:
- (a) forming a first mixture consisting essentially of silicon particulates, silicon carbide particulates, and aluminum oxide particulates;
- (b) contacting a surface of said substrate with said first mixture;
- (c) heating said surface of said substrate and the thus contacting first mixture under suitable reaction conditions to form a first coating on said surface of said substrate;
- (d) cooling the thus coated substrate surface;
- (e) forming a second mixture comprising boron particulates, silicon carbide particulates, and silicon particulates;
- (f) contacting said thus coated substrate surface with said second mixture;
- and
- (g) heating said thus coated substrate surface and the thus contacting second mixture under suitable reaction conditions to form a microstructure coating on said surface of said substrate.
Dependencies are inferred from the claim text.