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US 2002/0055004 A1Published application
Low-sulfur article having a platinum-aluminide protective layer, and its preparation
AssigneeGeneral Electric Company
InventorsWilliam S. Walston, Jon C. Schaeffer, Wendy H. Murphy
Life of this patent
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Abstract
A coated article is prepared by furnishing an 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.
Claims19
A coated article, comprising:
- an article substrate having a free sulfur content of more than 0 but less than about 1 part per million by weight;
- and
- a protective layer at a surface of the article substrate, the protective layer comprising a platinum aluminide diffusion layer.
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate comprising a nickel-base superalloy and having a free sulfur content of more than 0 but less than about 1 part per million by weight;
- and
- forming a protective layer at a surface of the article substrate, the protective layer comprising a platinum aluminide diffusion coating.
Dependencies are inferred from the claim text.