Pretreatment of High Temperature Ceramic Composites
AssigneeGeneral Electric Company
InventorKrishan Lal Luthra
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Abstract
Coated components, along with methods of their formation, are provided. The coated component may include a ceramic substrate having a Si-treated layer surrounding a ceramic core and an environmental barrier coating on the Si-treated layer of the ceramic substrate. The ceramic core may include silicon carbide, and the Si-treated layer may be pretreated to tailor its surface's properties for inhibiting or delaying the formation of carbon oxides to upon exposure of the Si-treated layer to oxygen.
Claims20
A coated component comprising:
- a ceramic substrate having a Si-treated layer surrounding a ceramic core, wherein the ceramic core comprises silicon carbide, wherein the Si-treated layer is pretreated to tailor its surface's properties for inhibiting or delaying the formation of carbon oxides to upon exposure of the Si-treated layer to oxygen;
- and
- an environmental barrier coating on the Si-treated layer of the ceramic substrate.
A coated component comprising:
- a ceramic substrate having a Si-treated layer surrounding a ceramic core, wherein the ceramic core comprises silicon carbide having a first ratio of silicon to carbon, and wherein the Si-treated layer comprises silicon carbide having a second ratio of silicon to carbon, with the second ratio having a greater amount of silicon relative to the first ratio;
- and
- an environmental barrier coating on the Si-treated layer of the ceramic substrate.
A method of coating a ceramic component on its outer surface, wherein the ceramic component comprises silicon carbide, the method comprising:
- exposing the outer surface of the ceramic component to silicon vapor at a temperature of about 1400° C. to about 1800° C. to form a Si-treated layer.
Dependencies are inferred from the claim text.