Method for preparing an article with a hafnium-silicon-modified platinum-aluminide bond or environmental coating
AssigneeGeneral Electric Company
InventorsJoseph D. Rigney, Ramgopal Darolia, William S. Walston
Life of this patent
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Abstract
An article such as a gas turbine blade or vane has a superalloy substrate, and a coating system deposited on the substrate. The coating system includes a protective layer overlying the substrate, and, optionally, a ceramic thermal barrier coating layer overlying the bond coat. The protective layer has an uppermost layer with a composition including platinum, aluminum, and, in atom percent, from about 0.14 to about 2.8 percent hafnium and from about 2.7 to about 7.0 percent silicon, with the atomic ratio of silicon:hafnium being from about 1.7:1 to about 5.6:1.
Claims7
A method for preparing an article, comprising the steps of
- providing a substrate;
- depositing a first layer comprising platinum on the substrate;
- depositing a second layer comprising aluminum, hafnium, and silicon on the layer of platinum;
- and
- heating the first layer comprising platinum and the second layer comprising aluminum, hafnium, and silicon so that the aluminum, hafnium, and silicon diffuse into the layer of platinum,
- the second layer having an average composition, in atomic percent, of from about 0.14 to about 2.8 percent hafnium and from about 2.7 to about 7.0 percent silicon.
Dependencies are inferred from the claim text.