Nickel-base superalloy article with rhenium-containing protective layer, and its preparation
AssigneeGeneral Electric Company
InventorsRamgopal Darolia, Joseph D. Rigney
Life of this patent
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Abstract
A nickel-base superalloy article has a surface protective layer comprising nickel, from about 20 to about 35 weight percent aluminum, and from about 0.5 to about 10 weight percent rhenium. The protective layer, which is preferably an overlay coating of the beta (β) phase NiAl form, is formed by depositing nickel, aluminum, rhenium, and modifying elements onto the substrate surface. A ceramic layer may be deposited overlying the protective layer.
Claims19
A method for preparing an article, comprising the steps of
- providing a substrate having a surface and comprising a nickel-base superalloy;
- and
- depositing a protective layer onto the surface of the substrate, the protective layer comprising nickel, from about 20 to about 35 weight percent aluminum, and from about 0.5 to about 10 weight percent rhenium.
A method for preparing an article, comprising the steps of
- providing a substrate having a surface and comprising a nickel-base superalloy;
- and
- depositing a protective layer onto the surface of the substrate, the protective layer comprising nickel, from about 20 to about 35 weight percent aluminum, and from about 0.5 to about 10 weight percent rhenium, wherein the protective layer comprises a predominantly beta (β) phase NiAl composition.
A method for preparing an article, comprising the steps of
- providing a substrate having a surface, wherein the substrate has a composition, in weight percent, of from about 4 to about 20 percent cobalt, from about 1 to about 10 percent chromium, from about 5 to about 7 percent aluminum, from 0 to about 2 percent molybdenum, from about 3 to about 8 percent tungsten, from about 4 to about 12 percent tantalum, from 0 to about 2 percent titanium, from 0 to about 8 percent rhenium from 0 to about 6 percent ruthenium, from 0 to about 1 percent niobium, from 0 to about 0.1 percent carbon, from 0 to about 0.01 percent boron, from 0 to about 0.1 percent yttrium, from 0 to about 1.5 percent hafnium, balance nickel and incidental impurities;
- and
- depositing a protective layer onto the surface of the substrate, the protective layer comprising nickel, from about 20 to about 35 weight percent aluminum, and from about 0.5 to about 10 weight percent rhenium.
Dependencies are inferred from the claim text.