Aluminide/MCrAlY coating system for superalloys
AssigneeHowmet Research Corporation
InventorsBruce M. Warnes, William J. Shriver, Ronald J. Honick, Jr., Nick S. DuShane
Life of this patent
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Abstract
High temperature oxidation resistance of an aluminide diffusion overcoated MCrAlY coating system is substantially improved by CVD over-aluminizing the MCrAlY type overlay coating under CVD conditions that result in reduced concentrations of such tramp impurities as S and P in the aluminized MCrAlY overlay coating region of the coating system. The CVD aluminizing conditions yield an outwardly grown aluminide over-coat on the underlying MCrAlY type coating.
Claims28
Coated gas turbine engine component, comprising a first coating on said component and consisting essentially of chromium, aluminum, an element selected from the group consisting of yttrium, rare earth element and a reactive element, and an element selected from the group consisting of nickel, cobalt and iron, and a chemical vapor deposition outwardly grown aluminide diffusion overcoating on said first coating.
A method of coating a substrate comprising, providing a first coating on said substrate, said first coating consisting essentially of chromium, aluminum, an element selected from the group consisting of yttrium, rare earth element and a reactive element, and an element selected from the group consisting of nickel, cobalt and iron, and aluminizing the first coating under chemical vapor deposition conditions to form an outwardly grown aluminide diffusion overcoating on said first coating.
Coated gas turbine engine component, comprising a first coating on said component and consisting essentially of chromium, aluminum, an element selected from the group consisting yttrium, rare earth element, and a reactive element, and an element selected from the group consisting of nickel, cobalt, and iron, and a chemical vapor deposition outwardly grown aluminide diffusion overcoating including an element selected from the group consisting of an alkali element and alkaline earth element.
Coated gas turbine engine component, comprising a first coating on said component and consisting essentially of chromium, aluminum, an element selected from the group consisting of yttrium, rare earth element, and a reactive element, and an element selected from the group consisting of nickel, cobalt, and iron, and a chemical vapor deposition outwardly grown aluminide diffusion overcoating on said first coating, said aluminide diffusion overcoating having an inner diffusion zone and outer single phase aluminide layer formed by outward growth of said overcoating.
Coated gas turbine engine component, comprising a first coating on said component and comprising MCrAlY where M is selected from the group consisting of nickel, cobalt, and iron, and a chemical vapor deposition outwardly grown aluminide diffusion overcoating on said first coating, said aluminide diffusion overcoating having an inner diffusion zone and outer single phase aluminide layer formed by outward growth of said overcoating.
Coated gas turbine engine component, comprising a first coating on said component and comprising MCrAlY where M is selected from the group consisting of nickel, cobalt, and iron, and a chemical vapor deposition outwardly grown aluminide diffusion overcoating on said first coating, said aluminide diffusion overcoating having an inner diffusion zone and outer single phase platinum-bearing aluminide layer formed by outward growth of said overcoating.
Dependencies are inferred from the claim text.