Oxidation-resistant coatings, and related articles and processes
AssigneeGeneral Electric Company
InventorsJi-Cheng Zhao, Melvin Robert Jackson, Ramgopal Darolia
Life of this patent
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Abstract
An oxidation-resistant coating is described, formed of an alloy containing: about 40 to about 50 atom % aluminum and about 0.5 atom % to about 3 atom % tantalum; with a balance of nickel; cobalt, iron, or combinations thereof. The coating may also include chromium and a precious metal, as well as other components, such as zirconium or molybdenum. A method for applying the oxidation-resistant coating to a substrate is also described. The substrate can be formed of superalloy material, e.g., a turbine engine component. Related articles are also disclosed.
Claims45
An oxidation-resistant coating, formed of an alloy comprising:
- about 40 to about 50 atom % aluminum;
- and
- about 0.5 atom % to about 3 atom % tantalum;
- with the balance comprising at least one base metal selected from the group consisting of nickel, cobalt, iron, and combinations thereof.
An oxidation-resistant coating, formed of an alloy comprising:
- about 40 to about 50 atom % aluminum;
- about 0.5 atom % to about 3 atom % tantalum;
- about 1 atom % to about 15 atom % chromium;
- and
- about 0.1 atom % to about 1 atom % zirconium;
- with the balance comprising at least one base metal selected from the group consisting of nickel and nickel-cobalt.
An oxidation-resistant coating, formed of an alloy comprising:
- about 40 to about 50 atom % aluminum;
- about 0.5 atom % to about 3 atom % tantalum;
- about 1 atom % to about 15 atom % chromium;
- and
- about 0.2 atom % to about 2.0 atom % molybdenum;
- with the balance comprising at least one base metal selected from the group consisting of nickel and nickel-cobalt.
A method for providing environmental protection to a metal-based substrate, comprising the step of forming a coating on the substrate, wherein the coating has an alloy composition which comprises:
- about 40 to about 50 atom % aluminum;
- and
- about 0.5 atom % to about 3 atom % tantalum;
- with the balance comprising a base metal selected from the group consisting of nickel, cobalt, iron, and combinations thereof.
An article, comprising:
- (i) a metal-based substrate;
- and
- (ii) an oxidation-resistant coating over the substrate, formed of an alloy comprising:
- about 40 to about 50 atom % aluminum;
- and
- about 0.5 atom % to about 3 atom % tantalum;
- with the balance comprising nickel, cobalt, iron, or combinations thereof.
Dependencies are inferred from the claim text.