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US 9,719,353 B2Granted
Interfacial diffusion barrier layer including iridium on a metallic substrate
AssigneeROLLS-ROYCE plc
InventorsAnn Bolcavage, Randolph C. Helmink
Life of this patent
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Abstract
An article may include a substrate, a diffusion barrier layer formed on the substrate, and a protective layer formed on the diffusion barrier coating. The diffusion barrier layer may include iridium.
Claims19
An article comprising:
- a nickel-based superalloy substrate including between about 2 wt. % and about 5 wt. % aluminum and between about 2 wt. % and about 5 wt. % titanium, wherein the nickel-based superalloy substrate comprises between 40 volume percent and 55 volume percent gamma-prime precipitate phase;
- a diffusion barrier layer on the substrate, wherein the diffusion barrier layer comprises an alloy comprising iridium and silicon, and wherein the alloy comprises a majority iridium;
- and
- a nickel-based protective layer comprising nickel and at least one of aluminum or chromium on the diffusion barrier layer.
1 more element
A method comprising:
- forming a diffusion barrier layer on a nickel-based superalloy substrate, wherein the diffusion barrier layer comprises an alloy comprising iridium and silicon, wherein the alloy comprises a majority iridium, wherein the nickel-based superalloy substrate includes between about 2 wt. % and about 5 wt. % aluminum and between about 2 wt. % and about 5 wt. % titanium, and wherein the nickel-based superalloy substrate comprises between about 40 volume percent and about 55 volume percent gamma-prime precipitate phase;
- and
- forming a nickel-based protective layer comprising nickel and at least one of aluminum or chromium on the diffusion barrier layer.
An article comprising:
- a nickel-based superalloy substrate including between about 2 wt. % and about 5 wt. % aluminum and between about 2 wt. % and about 5 wt. % titanium, wherein the nickel-based superalloy substrate comprises between 40 volume percent and 55 volume percent gamma-prime precipitate phase;
- a diffusion barrier layer on the substrate, wherein the diffusion barrier layer comprises an alloy comprising iridium and silicon, and wherein the alloy comprises a predominance of iridium;
- and
- a nickel-based protective layer comprising nickel and at least one of aluminum or chromium on the diffusion barrier layer.
1 more element
Dependencies are inferred from the claim text.