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US 5,763,107 AGranted
Thermal barrier coating for a superalloy article
AssigneesROLLS-ROYCE plc, Chromalloy United Kingdom Limited
InventorsDavid S. Rickerby, Daniel K. White, Stanley R. Bell
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Abstract
A coated article includes a superalloy substrate, an intermediate bond coat and a thermal barrier coating. The bond coat may include a platinum aluminide layer underlying a thin oxide layer. The thin oxide layer may include alumina. The coated article has high strength and durability at high temperatures over extended periods of time and thus is especially useful in the form of, e.g., a turbine blade or turbine vane.
Claims25
A multi-layer thermal barrier coated article, comprising:
- a superalloy substrate,
- an aluminum-containing alloy bond coat on the substrate, the aluminum-containing alloy bond coat having a platinum-group metal enriched outer layer, the outer layer being enriched with platinum-group metal relative to an inner portion of the aluminum-containing alloy bond coat, the platinum-group metal enriched outer layer of the aluminum-containing alloy bond coat having a surface layer predominantly comprising a continuous layer of at least one platinum-group metal aluminide,
- an adherent oxide layer comprising alumina and covering the platinum-group metal aluminide surface layer of the bond coat,
- and an insulating ceramic coating covering the oxide layer, wherein the completed coated article has yet to be subjected to thermal stress.
1 more element
A multi-layer thermal barrier coated article, comprising:
- a superalloy substrate,
- a bond coated article on the superalloy substrate, the bond coated article comprising an aluminum-containing alloy coated article, a platinum-group metal enriched aluminum-containing alloy layer and a coated article predominantly comprising a continuous layer of at least one platinum-group metal aluminide, the platinum-group metal enriched aluminum-containing alloy layer being enriched with platinum-group metal relative to the aluminum-containing alloy coating, the aluminum-containing alloy coating overlying the superalloy substrate, the platinum-group metal enriched aluminum-containing alloy layer overlying the aluminum-containing alloy coating and the coating of at least one platinum-group metal aluminide overlying the platinum-group metal enriched aluminum-containing alloy layer,
- an adherent oxide layer overlying the bond coating, the adherent oxide layer overlying the coating of at least one platinum-group metal aluminide, the adherent oxide layer comprising alumina without other spinels in amounts sufficient to substantially disrupt the alumina lattice structure,
- and a ceramic insulating coating on the adherent oxide layer,
- wherein the platinum-group metal enriched aluminum-containing alloy layer and the coating of at least one platinum-group metal aluminide reduce migration of transition metal elements through the bond coating to the ceramic coating, and wherein the completed coated article has yet to be subjected to thermal stress.
2 more elements
Dependencies are inferred from the claim text.