Low-sulfur article having a platinum-aluminide protective layer, and its preparation
OwnerWilliam S. Walston, Jon C. Schaeffer +1inventors
InventorsWilliam S. Walston, Jon C. Schaeffer, Wendy H. Murphy
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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.
Claims22
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.
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate comprising a nickel-base alloy and having a free sulfur content of more than 0 but less than about 1 part per million by weight;
- and
- forming a protective later at a surface of the article substrate, the protective layer comprising a platinum aluminide diffusion coating.
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate comprising a nickel-base alloy and having a free sulfur content of more than 0 but less than about 0.5 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.
The method of claim wherein the ceramic layer has a sulfur content of less than about 1 part per million by weight and the protective layer has a sulfur content of less than about 1 part per million by weight.
Dependencies are inferred from the claim text.