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US 5,658,614 AGranted
Platinum aluminide CVD coating method
AssigneeHowmet Research Corporation
InventorsWilliam C. Basta, David C. Punola, Bruce M. Warnes
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AssigneeHowmet Research Corporation
InventorsWilliam C. Basta, David C. Punola, Bruce M. Warnes
Estimating the term…
A method of improving the oxidation resistance of a platinum modified aluminide coating formed on a nickel base superalloy substrate, comprises providing a platinum layer on the substrate, heating the substrate in a coating retort to a temperature of at least about 1000.degree. C., forming external of the coating retort a high purity coating gas comprising hydrogen and aluminum trichloride, and introducing the coating gas into the coating retort to contact the heated substrate to form an outwardly grown, single phase [(Ni,Pt)]Al] platinum modified aluminide coating having reduced concentration of at least one of a substrate substitutional alloying element and a surface active tramp element selected from at least one of B, P, and S in said coating as compared to a platinum modified aluminide coating formed at a lower temperature.
A method of improving the oxidation resistance of a platinum modified aluminide coating formed on a nickel base superalloy substrate, comprising:
A method of repairing an engine-run component having an existing aluminide coating at a region and an uncoated, metallic repair material at another region, comprising providing at said region an existing aluminide coating with a thickness not exceeding about 70 microns, depositing a layer comprising platinum on both of said regions and aluminizing both of the platinum coated regions under chemical vapor deposition conditions effective to outwardly grow a platinum bearing aluminide coating at both of said regions having nearly equal coating thickness at both of said regions.
A method of repairing an engine-run component having an existing aluminide coating at a region and an uncoated, metallic repair material at another region, comprising providing at said region an existing aluminide coating with a thickness not exceeding about 70 microns, depositing a layer comprising platinum on both of said regions and aluminizing the platinum coated regions without a prediffusion treatment of the platinum layer into said substrate under chemical vapor deposition conditions effective to outwardly grow a platinum bearing aluminide coating at both of said regions having nearly equal coating thickness at both of said regions.
Dependencies are inferred from the claim text.