High-Temperature Coatings With Pt Metal Modified gamma-Ni + gamma'-Ni3Al Alloy Compositions

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, and Ni, wherein the alloy has a solely γ′-Ni3Al phase constitution.

A coating on a substrate, wherein the coating comprises about 10 at % to about 30 at % of a Pt-group metal, less than about 23 at % Al, and about 0.5 at % to about 2 at % of a reactive element selected from Hf, Y, La, Ce, Zr and combinations thereof, and Ni, and wherein 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, and Ni, such that the bond coat has a solely γ′-Ni3Al phase constitution.

A coating composition comprising about 10 at % to about 22 at % Al, about 10 at % to about 30 at % Pt, a about 0.5 at % to about 2 at % of Hf, and Ni, wherein the coating composition alloy has a solely γ′-Ni3Al phase constitution.