Patent ID: 6579627
Filing Date: 2003-06-17
Classification: C23C,Y02T,Y10T

Abstract:
A nickel-base superalloy article protected by a protective layer, comprising:a substrate having a surface and comprising a nickel-base superalloy; and a protective layer on the surface of the substrate, the protective layer comprising a predominantly beta (&bgr;) phase NiAl composition having nickel, from about 20 to about 35 weight percent aluminum, at least two modifying elements selected from the group consisting of zirconium, hafnium, yttrium, and silicon, and other elements interdiffused from the substrate, wherein each of the modifying elements zirconium, hafnium, and silicon which is present is included in the protective layer in an amount of from about 0.1 to about 5 percent by weight of the protective layer, and the modifying element yttrium, where present, is included in the protective layer in an amount of from about 0.1 to about 1 percent by weight of the protective layer.