Nickel-base superalloys especially useful as compatible protective environmental coatings for advanced superaloys
AssigneeGeneral Electric Company
InventorsMelvin R. Jackson, Mark L. Prugar, Swe-Wong Yang, John R. Rairden, III, Michael F. X. Gigliotti, Jr.
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Abstract
There is provided by the present invention an alloy which is mechanically and chemically compatible with advanced nickel-base superalloys and nickel-base eutectic superalloys and which possesses excellent resistance to high temperature oxidation. The alloy of the invention is, therefore, particularly useful as a protective environmental coating for the external surfaces of hot-stage aircraft gas turbine engine components, e.g., rotating blades and stationary vanes, made from such advanced superalloys.
Claims18
A composition for application to nickel-base superalloy substrates consisting essentially of, by weight, 1 to 10% cobalt, 6 to 12% chromium, 5 to 8% aluminum, 1 to 10% tantalum, 1 to 10% tungsten, 0 to 3% rhenium, 0 to 2% molybdenum, 0.1 to 2% hafnium, 0.005 to 0.1% boron, 0.005 to 0.25% carbon, the balance nickel and incidental impurities.
A high temperature oxidation and corrosion resistant coated nickel-base superalloy article characterized by high coating-substrate compatibility, said article comprising:
- (a) a nickel-base superalloy or nickel-base eutictic superalloy substrate, and
- (b) a coating providing at least a portion of the outer surface of said article, said coating consisting essentially of, by weight, 1 to 10% cobalt, 6 to 12% chromium, 5 to 8% aluminum, 1 to 10% tantalum, 1 to 10% tungsten, 0 to 3% rhenium, 0 to 2% molybdenum, 0.1 to 2% hafnium, 0.005 to 0.1% boron, 0.005 to 0.25% carbon, the balance nickel and incidental impurities.
A composite article of manufacture comprising:
- (i) a nickel-base superalloy or nickel-base eutectic superalloy substrate, and
- (ii) one or more thick, built-up regions integral with said substrate, said regions providing at least a portion of the outer surface of said article, said regions having a composition consisting of, by weight, 1 to 10% cobalt, 6 to 12% chromium, 5 to 8% aluminum, 1 to 10% tantalum, 1 to 10% tungsten, 0 to 3% rhenium, 0 to 2% molybdenum, 0.1 to 2% hafnium, 0.005 to 0.1% boron, 0.005 to 0.25% carbon, the balance nickel and incidental impurities.
Dependencies are inferred from the claim text.