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US 2006/0040128 A1Published application
Protected article having a layered protective structure overlying a substrate
AssigneeGeneral Electric Company
InventorsMark Gorman, Ramgopal Darolia
Life of this patent
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Abstract
A protected article has a substrate and a protective structure overlying a surface of the substrate. The protective structure includes a protective layer overlying the surface of the substrate and having an aluminum content greater than that of the substrate, and a bond-coat layer of a bond-coat-layer metal. The bond-coat-layer metal has a bond-coat initial composition having at least about 60 percent by weight platinum, rhodium, palladium, or combinations thereof. There may be a diffusion-barrier layer between the surface of the substrate and the protective layer, and there may be a ceramic thermal barrier coating overlying the bond-coat layer.
Claims23
A protected article, comprising:
- a substrate having a substrate aluminum content;
- and
- a protective structure overlying a surface of the substrate, the protective structure comprising
- a protective-layer overlying the surface of the substrate and having a protective layer aluminum content greater than the substrate aluminum content by at least 3 atomic percent aluminum, and
- a bond-coat layer of a bond-coat-layer metal having a bond-coat initial composition comprising at least about 60 percent by weight of an element selected from the group consisting of platinum, rhodium, palladium, and combinations thereof, wherein the bond-coat layer overlies the protective layer so that the protective layer lies between the bond-coat layer and the surface of the substrate.
2 more elements
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A protected article, comprising:
- a nickel-base superalloy substrate having a substrate aluminum content;
- and
- a protective structure overlying a surface of the substrate, the protective structure comprising
- a protective layer overlying the surface of the substrate and having a protective-layer aluminum content greater than the substrate aluminum content,
- a diffusion-barrier layer overlying the surface of the substrate so that the diffusion-barrier layer lies between the surface of the substrate and the protective layer, wherein the diffusion-barrier layer comprises at least about 50 percent by weight of an element selected from the group consisting of rhenium, ruthenium, tungsten, and iridium;
- and
- a bond-coat layer of a bond-coat-layer metal having a bond-coat initial composition comprising at least about 60 percent by weight of an element selected from the group consisting of platinum, rhodium, palladium, and combinations thereof, wherein the bond-coat layer overlies the protective layer so that the protective layer lies between the bond-coat layer and the surface of the substrate.
4 more elements
(cancel)
A protected article, comprising:
- a substrate having a substrate aluminum content;
- and
- a protective structure overlying a surface of the substrate, the protective structure comprising
- a protective layer overlying the surface of the substrate and having a protective-layer aluminum content greater than the substrate aluminum content, and
- a bond-coat layer of a bond-coat-layer metal having a bond-coat initial composition comprising at least about 60 percent by weight of an element selected from the group consisting of platinum, rhodium, palladium, and combinations thereof, wherein the bond-coat layer has a thickness of at least 25 percent of the thickness of the protective layer, and wherein the bond-coat layer overlies the protective layer so that the protective layer lies between the bond-coat layer and the surface of the substrate.
2 more elements
A protected article, comprising:
- a substrate having a substrate aluminum content;
- and
- a protective structure overlying a surface of the substrate, the protective structure comprising
- a protective layer overlying the surface of the substrate and having a protective-layer aluminum content greater than the substrate aluminum content, and
- a bond-coat layer of a bond-coat-layer metal having a bond-coat initial composition comprising at least about 60 percent by weight of an element selected from the group consisting of platinum, rhodium, palladium, and combinations thereof, wherein the bond-coat initial composition further includes at least one element selected from the group consisting of iridium, chromium, nickel, aluminum, zirconium, hafnium, tantalum, rhenium, and ruthenium, and wherein the bond-coat layer overlies the protective layer so that the protective layer lies between the bond-coat layer and the surface of the substrate.
2 more elements
A protected article, comprising:
- a substrate having a substrate aluminum content;
- and
- a protective structure overlying a surface of the substrate, the protective structure comprising
- a protective layer overlying the surface of the substrate and having a protective-layer aluminum content greater than the substrate aluminum content,
- a diffusion-barrier layer between the surface of the substrate and the protective layer;
- and
- a bond-coat layer of a bond-coat-layer metal having a bond-coat initial composition comprising at least about 60 percent by weight of an element selected from the group consisting of platinum, rhodium, palladium, and combinations thereof, wherein the bond-coat layer overlies the protective layer so that the protective layer lies between the bond-coat layer and the surface of the substrate.
4 more elements
Dependencies are inferred from the claim text.