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US 6,273,678 B1Granted
Modified diffusion aluminide coating for internal surfaces of gas turbine components
AssigneeGeneral Electric Company
InventorRamgopal Darolia
Life of this patent
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Abstract
An article is formed of a gas turbine component having a substrate, an internal passage through the substrate defining an internal surface of the substrate, and an internal protective layer overlying the internal surface of the substrate. The internal protective layer has a composition of aluminum, plus, in weight percent, on average from about 0.1 to about 5.0 percent of a modifying element selected from the group consisting of hafnium, yttrium, zirconium, chromium, and silicon, and combinations thereof, and elements found in the substrate.
Claims19
An article comprising:
- a gas turbine component having
- a substrate,
- an internal passage through the substrate defining an internal surface of the substrate, and
- an external surface of the substrate;
- and
- an internal protective layer overlying the internal surface of the substrate, the internal protective layer having a composition comprising aluminum, plus, in weight percent, on average from about 0.1 to about 5.0 percent of a modifying element selected from the group consisting of hafnium, yttrium, zirconium, chromium, and silicon, and combinations thereof.
3 more elements
A method for preparing an article, comprising the steps of
- providing a substrate having an internal passage therethrough defining an internal surface of the substrate;
- depositing a layer onto the internal surface comprising aluminum and a modifying element selected from the group consisting of hafnium, yttrium, zirconium, chromium, and silicon, and combinations thereof;
- and
- heating the layer comprising aluminum and the modifying element so that the aluminum and the modifying element diffuse into the substrate to form an internal protective layer, the internal protective layer having an average composition of from about 16 to about 30 weight percent aluminum, from about 0.1 to about 5.0 weight percent of the modifying element, and other elements interdiffused from the substrate.
1 more element
Dependencies are inferred from the claim text.