| abstract |
(57) [Abstract] [Object] To improve oxidation resistance at high temperatures in diffusion coating and vapor deposition coating of platinum aluminide. [Constitution] Platinum aluminide diffusion coating grown on the outer surface by CVD operation on nickel or cobalt based superalloy base material. In this case, the aluminide diffusion coating by platinum modification is modified, and the outer surface of the coating is added. About 0.0% of the (Ni, Pt) (AL, Si) layer It contains silicon, hafnium, optionally zirconium and / or a separate active element (eg Ce, La, Y, etc.) in a concentration of 1% to about 8% by weight. The special coating contains from about 0.01% to less than 2% by weight of each of the elements silicon and zirconium in the outer additive layer, preferably keeping the Hf / Si elemental ratio below about 1. Here, when Zr is used, the Hf + Zr / Si element ratio is set to about 1 or less. The inner diffused portion or region in contact with the substrate and the outer doped (Ni, Pt) (AL, Si) layer include hafnium silicide-second phase particles or regions uniformly dispersed in the outer doped layer of the coating. |