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US 4,005,989 AGranted
Coated superalloy article
AssigneeUnited Technologies Corporation
InventorNoel Butters Preston
Life of this patent
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Abstract
A protective coating is provided on gas turbine engine type superalloys comprising an interlayer adjacent the superalloy substrate a principal protective element of which comprises an aluminide of the basis metal of the substrate formed by the reaction of aluminum at high temperature with the substrate, and an overlayer comprising an MCrAlY-type coating where M is selected from the group consisting of cobalt, nickel and iron.
Claims9
A coated article comprising:
- a superalloy substrate,
- a first coating thereon consisting essentially of an aluminide of the basis metal of the substrate, and
- an MCrAlY coating thereover,
- where M is selected from the group consisting of nickel, cobalt, and iron.
1 more element
A coated article comprising:
- a superalloy substrate the basis metal of which is an element selected from the group consisting of nickel, cobalt or iron,
- a first protective coating thereon the principal protective element of which consists essentially of a ductile aluminide of the basis metal;
- and
- an MCrAlY overlay coating over the first coating, where M is selected from the group consisting of nickel, cobalt and iron.
1 more element
A coated gas turbine engine component which comprises:
- a nickel-base superalloy substrate,
- a ductile nickel aluminide coating formed at the substrate surface, and
- a NiCoCrAlY coating over the aluminide coating.
A coated gas turbine engine component which comprises:
- a nickel-base superalloy substrate,
- a ductile nickel aluminide layer on the substrate surface, and
- a CoCrAlY coating over the aluminide layer.
Dependencies are inferred from the claim text.