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US 7,510,779 B2Granted
Low-sulfur article having a platinum aluminide protective layer and its preparation
AssigneeGeneral Electric Company
InventorsWilliam Scott Walston, Jon Conrad Schaeffer, Wendy Howard Murphy
Life of this patent
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Abstract
A coated article is prepared by furnishing a nickel-base article substrate having a free sulfur content of more than 0 but less than about 1 part per million by weight. A protective layer is formed at a surface of the article substrate. The protective layer includes a platinum aluminide diffusion coating. The protective layer may be substantially yttrium-free, or have a controlled amount of yttrium. A ceramic layer may overlie the protective layer.
Claims18
A coated article, comprising:
- an article substrate having a surface comprising a free sulfur content of less than about 1 part per million by weight;
- a protective layer disposed on the surface of the article substrate, the protective layer comprising a platinum aluminide diffusion layer;
- and
- wherein the free sulfur content further being sufficiently low to maintain adherence of the protective layer to the surface when exposed to gas turbine engine service conditions.
1 more element
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate comprising a nickel-base superalloy, the article substrate having a surface comprising a free sulfur content of less than about 1 part per million by weight;
- forming a protective layer at a surface of the article, the protective layer comprising a platinum aluminide diffusion coating;
- and
- wherein the free sulfur content further being sufficiently low to maintain adherence of the protective layer to the surface when exposed to gas turbine engine service conditions.
1 more element
Dependencies are inferred from the claim text.