Environment-resistant platinum aluminide coatings, and methods of applying the same onto turbine components

A method for coating a surface of a turbine component with an environment-resistant aluminide, comprising the steps of:

• plating the turbine component with at least one metal material;
• forming a coating over the plating by cold gas-dynamic spraying a powder material on the plated turbine component surface, the powder material comprising aluminum, and at least one additional metal selected from the group consisting of nickel, platinum, chromium, hafnium, silicon, yttrium, rhenium, zirconium, cobalt, and tantalum;
• and
• performing at least one thermal diffusion treatment to metallurgically homogenize the coating and thereby form an aluminide coating.

A method for coating a surface of a turbine component with an environment-resistant aluminide, comprising the steps of:

• forming a first coating by cold gas-dynamic spraying a first powder material on the turbine component surface, the first powder material comprising at least one metal selected from the group consisting of nickel, aluminum, platinum, chromium, hafnium, silicon, yttrium, rhenium, zirconium, cobalt, and tantalum;
• forming a second coating by cold gas-dynamic spraying a second powder material on the first coating, the second powder material comprising at least one metal selected from the group consisting of nickel, aluminum, platinum, chromium, hafnium, silicon, yttrium, rhenium, zirconium, cobalt, and tantalum;
• and
• performing at least one thermal diffusion treatment to metallurgically homogenize the combined first and second coatings and thereby form an aluminide coating that comprises by weight about 12 to about 30% aluminum, up to about 50% platinum, about 2 to about 25% chromium, about 0.1 to about 5% hafnium, about 1 to about 5% silicon, about 0.1 to about 3% yttrium, and about 0.1 to about 3% Zr, and nickel.