High-temperature coatings with Pt metal modified γ-Ni + γ′-Ni3Al alloy compositions
AssigneeIowa State University Research Foundation, Inc.
InventorsBrian M. Gleeson, Daniel J. Sordelet, Wen Wang
Life of this patent
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Abstract
An alloy including: about 10 at % to about 30 at % of a Pt-group metal; less than about 23 at % Al; about 0.5 at % to about 2 at % of at least one reactive element selected from Hf, Y, La, Ce and Zr, and combinations thereof; a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof; and Ni; wherein the Pt-group metal, Al, the reactive element and the superalloy substrate constituent are present in the alloy in a concentration to the extent that the alloy has a solely γ′-Ni3Al phase constitution.
Claims25
An alloy comprising:
- about 10 at % to about 30 at % of a Pt-group metal;
- less than about 23 at % Al;
- about 0.5 at % to about 2 at % of at least one reactive element selected from Hf, Y, La, Ce and Zr, and combinations thereof;
- a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof;
- and
- Ni;
- wherein the Pt-group metal, Al, the reactive element and the superalloy substrate constituent are present in the alloy in a concentration to the extent that the alloy has a solely γ′-Ni3Al phase constitution.
A Ni—Al—Pt—Hf alloy comprising:
- less than about 23 at % Al;
- about 10 at % to about 30 at % of a Pt-group metal;
- about 0.5 at % to about 2 at % Hf;
- a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof;
- and
- Ni;
- wherein the Pt-group metal, Al, the Hf and the superalloy substrate constituent are present in the alloy in a concentration to the extent that the alloy has a solely γ′-Ni3Al phase constitution.
A coating on a superalloy substrate, wherein the coating comprises:
- about 10 at % to about 30 at % of a Pt-group metal;
- less than about 23 at % Al;
- about 0.5 at % to about 2 at % of a reactive element selected from Hf, Y, La, Ce, Zr and combinations thereof;
- a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof;
- and
- Ni, and
- wherein the Pt-group metal, Al, the reactive element and the superalloy substrate constituent are present in the coating in a concentration to the extent that the coating has a solely γ′-Ni3Al phase constitution.
A thermal barrier coated article comprising:
- (a) a superalloy substrate;
- (b) a bond coat on the substrate, wherein the bond coat comprises:
- about 10 at % to about 30 at % Pt,
- less than about 23 at % Al,
- about 0.5 at % to about 2 at % of a reactive element selected from Hf, Y, La, Ce, Zr, and combinations thereof,
- a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof, and
- Ni,
- wherein the Pt, Al, the reactive element and the superalloy substrate constituent are present in the bond coat in a concentration such that the bond coat has a solely γ′-Ni3Al phase constitution.
A thermal barrier coated article comprising:
- (a) a superalloy substrate;
- (b) a bond coat on the substrate, wherein the bond coat comprises an alloy comprising:
- about 10 at % to about 30 at % of a Pt-group metal,
- less than about 23 at % Al,
- about 0.5 at % to about 2 at % of Hf,
- a superalloy substrate constituent selected from the group consisting of Cr, Co, Mo, Ta, Re and combinations thereof, and
- Ni,
- wherein the Pt-group metal, Al, the Hf and the superalloy substrate constituent are present in the bond coat in a concentration such that the alloy has a solely γ′-Ni3Al phase constitution;
- (c) an adherent layer of oxide on the bond coat;
- and
- (d) a ceramic coating on the adherent layer of oxide.
Dependencies are inferred from the claim text.