High temperature ceramic composite
AssigneeMinnesota Mining and Manufacturing Company
InventorRobert G. Smith
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Abstract
This invention provides a shaped ceramic composite article comprising ceramic oxide fiber(s), a first coating comprising a carbonaceous matrix which includes boron nitride particles in contact therewith, and a second coating comprising silicon carbide. The inventive composite article is useful in applications requiring good heat resistance and mechanical properties, such as gas fired radiant burner tubes, gas burner nozzle liners, heat exchangers, thermowells, core busters or flame dispersers, and other gas fired furnace components.
Claims14
A method of making a shaped composite article, said method comprising the steps of
- (a) preparing a shaped, rigidified article comprising ceramic oxide fiber, said ceramic oxide fiber having in said shaped, rigidified article a surface with a coating comprising cured organic resin which includes boron nitride particles in contact therewith, wherein said coating covers at least a portion of said surface, and wherein said organic resin is capable of being carbonized;
- (b) carbonizing said cured organic resin to provide a first coating at least partially covering said surface to provide a surface which is available for overcoating, said first coating comprising a carbonaceous matrix which includes boron nitride particles;
- and
- (c) depositing a second coating comprising silicon carbide onto at least a portion of said first coating,
- to provide a shaped composite article.
Dependencies are inferred from the claim text.