Low Sulfur Nickel Base Substrate Alloy and Overlay Coating System
AssigneeUnited Technologies Corporation
InventorsAlan D. Cetel, Dilip M. Shah
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Abstract
A coated article having an improved coating oxidation life includes a superalloy substrate material having a composition which includes sulfur, herein the sulfur is present in an amount less than 1 ppm; and an overlay coating formed over a surface of the substrate material.
Claims11
1-12. (canceled)
A process for forming a coated article having an improved coating oxidation life comprising the steps of:
- casting a superalloy substrate material having a composition which includes sulfur, wherein said sulfur is present in an amount less than 1 ppm;
- and
- forming an overlay coating over a surface of said substrate material.
A master heat for casting a single crystal nickel based superalloy substrate material, said master heat containing active elements in such a way that [wt. ppm of Mg]+[(24/40)×(wt. ppm of Ca)]+[(24/89)×(wt. ppm of Y)]+[(24/atomic weight of any other active element)×(wt. ppm of the said active element)] is greater than or equal to 20.
Dependencies are inferred from the claim text.