| abstract |
Coating system for a metallic substrate includes a strengthened bond coat including a bond coat inner layer and an aluminum-containing layer overlying the bond coat inner layer. The bond coat inner layer is formed by deposition of a bond coat composition including, in weight percent, 14-20 % Cr, 5-8 % Al, 8-12 % Co, 3-7 % Ta, 0.1-0.6 % Hf, 0.1-0.5 % Y, up to about 1% Si, 0.005-0.020 % Zr, 0.04-0.08 % C, 0.01- 0.02% B, with a remainder including Ni and incidental impurities, wherein the bond coat composition is substantially free of rhenium. The coating system includes an optional thermal barrier coating which may be a yttria-stabilized zirconia. |