Loral Vought Systems Corporation

Ltv Aerospace & Defense Company

Vought Corporation

David M Shuford

John S Linck

Roy E Booth

In accordance with the invention, a composition of matter is provided for forming a coating for protecting carbonaceous substrates from degradation at elevated temperatures. The composition is a mixture of particulate silicon, silicon carbide and boron. The mixture contains between about 25% and 40% silicon by weight of the total composition, between about 50% and 70% by weight silicon carbide by weight of the total composition, between about 1% and 15% boron by way of the total composition and a minor amount of magnesium. The compositions can be used in a method for forming a primary protective coating on carbonaceous substrates including, in particular, reinforced carbon-carbon materials produced using chemical vapor deposition techniques.

Composition and method for forming a protective coating on carbon-carbon

In accordance with the invention, compositions of matter are provided for forming two coatings for protecting carbonaceous substrates from degradation at elevated temperatures and to improve said substrate's resistance to surface crazing and cracking. Preferably, the compositions are a mixture of particulate silicon, silicon carbide, alumina and boron. Preferably, the primary mixture contains between about 40% and 50% silicon by weight of the total composition, between about 30% and 50% silicon carbide by weight of the total composition, and between about 20% and 30% alumina by weight of the total composition. Preferably, the secondary mixture contains between about 25% and 40% silicon by weight of the total composition, between about 50% and 70% silicon carbide by weight of the total composition, between about 1% and 15% boron by weight of the total composition, and a minor amount of magnesium oxide. The method is provided for forming a primary protective coating on carbonaceous substrates utilizing the aforesaid primary and secondary mixtures.

Carbon-carbon substrates having protective coating and their preparation

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.

Conversion coating on carbon/carbon composites with controlled

A post treatment for carbon-carbon substrates for the protection of carbon and graphite materials to which have been applied a silicon carbide primary coating from degradation at elevated temperatures. The treatment comprising coating the substrate with a first film of monoaluminum phosphate, water, particulate silicate carbide, silicon carbide felt, alumina, and boron; curing the first film, applying over the first film, a second film comprising water, sodium silicate, sodium borate, particulate silicon carbide and silicon carbide felt, and curing the second coating. Optionally a third film may be applied over the cured second film. The third film comprises sodium borate, water and sodium silicate which is cured after application.

Post coating treatment of silicon carbide coated carbon-carbon substrates

A post treatment for protection from degradation at elevated temperatures of carbon and graphite materials to which have been applied a silicon carbide primary coating. The treatment comprising coating the substrate with a first film comprising monoaluminum phosphate, water, particulate silicon carbide, silicon carbide felt, alumina, and .boron; curing the first film, applying over the first film, a second film comprising monoaluminum phosphate, water, alumina and boron; curing the second film, applying a third film comprising water, sodium silicate, sodium borate, boron, particulate silicon carbide and silicon carbide felt; curing the third film, applying a fourth film comprising sodium borate, water, sodium silicate, boron and alumina which is cured after application.

In accordance with the invention, a composition of matter is provided for forming a coating for protecting carbonaceous substrates from degradation at elevated temperatures. The composition of matter is a mixture of particulate silicon, silicon carbide and alumina. The mixture contains between about 40% and 50% silicon by weight of the total composition, between about 30% and 50% silicon carbide by weight of the total composition and between about 20% and 30% alumina by weight of the total composition. A method is provided for forming a primary protective coating on carbonaceous substrates utilizing the aforesaid mixture. An enhancement coating is provided for sealing the primary coating in applications where the substrate will be subjected to elevated temperatures and temperature cycling.

Composition for forming a protective coating on carbon-carbon substrates

Alumina silicon carbide, and silicon primary protective coatings for

A process for sealing silicon carbide primary coatings of carbonaceous substrates comprising impregnation and curing with tetraethyl orthosilicate, application of a sealant mixture followed by curing, application of a liquid sealant followed by curing, high temperature heat treatment, and repetitive of the application of the materials described above.

Enhancement coating and process for carbonaceous substrates

In accordance with the invention, a composition of matter is provided for forming a coating for protecting carbonaceous substrates from degradation at elevated temperatures. The composition is a mixture of particulate silicon, silicon carbide and boron. The mixture contains between about 25% and 40% silicon by weight of the total composition, between about 50% and 70% by weight silicon carbide by weight of the total composition, between about 1% and 15% boron by weight of the total composition and a minor amount of magnesium oxide. The method is provided for forming a primary protective coating on carbonaceous substrates utilizing the aforesaid mixture. An enhancement coating is provided for sealing the primary coating in applications where the substrate will be subjected to elevated temperatures and temperature cycling.

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Grand Prairie, TX, United States of America

David M Shuford