Patent ID: 7264887

Claim:
A surface coating on an article, the surface coating comprising: an inner layer of a first high temperature metallic coating consisting of one of a first β-NiAl, a first γ/β-MCrAlY, a first γ/γ′-MCrAlY, and a first γ-MCrAlY, each including a first noble metal selected from the group consisting of platinum, palladium, and rhodium, an outer layer of a second high temperature metallic coating disposed on top of the inner layer, the second high temperature metallic coating being coarser than the first high temperature metallic coating and consisting of one of a second β-NiAl, a second γ/β-MCrAlY, a second γ/γ′-MCrAlY, and a second γ-MCrAlY, and having a second noble metal selected from the group consisting of platinum, palladium, and rhodium, wherein the first and second β-NiAl and the first and second γ/β-MCrAlY, if present, include at least one element selected from the group consisting of Fe, Ga, Mo, B, Hf, Zr or Ta; and a Thermal Barrier Coating.