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US 8,475,606 B2Granted
In-situ oxidized thermally applied ceramic coating
OwnerC. Edward Eckertinventor
Life of this patent
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Abstract
Rendering a refractory coating on a metal substrate impenetrable by molten metal.
Claims8
A method of rendering a refractory coating on a metal substrate impenetrable by molten metal, the method comprising the steps of:
- (a) applying a refractory coating to a metal substrate;
- (b) stressing the coating to relax residual stresses;
- (c) infiltrating aluminum or an alloy thereof into cracks or pores in the refractory coating to a depth which avoids reaction with the metal substrate;
- and (d) converting the infiltrated aluminum or alloy thereof into cracks and pores to an oxide which occupies said cracks and pores, thereby rendering said refractory coating impenetrable by molten metal.
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A method of rendering a refractory coating on a titanium substrate impenetrable by molten aluminum, the method comprising the steps of:
- (a) plasma spraying a refractory coating onto a titanium substrate;
- (b) stressing the coating to relax residual stresses;
- (c) infiltrating aluminum or alloy thereof into cracks or pores in the refractory coating to a depth which avoids reaction with the metal substrate;
- and (d) converting the infiltrated aluminum to an oxide by treating with NaOH or H2O2, which oxide occupies said cracks and pores, thereby rendering said refractory coating impenetrable by molten aluminum.
1 more element
Dependencies are inferred from the claim text.