Preparation and High Temperature Performance of Rare Earth Oxide Modified Zirconia/PtAl Thermal Barrier Coatings
FANG Xiang1, YUAN Ke1, ZENG Jiamin1, HUANG Zilin1, WANG Qiang1, GAO Yuyi2, YANG Qian2, HE Wenting2, WEI Liangliang3
1. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China;
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
3. Research Institute for Frontier Science, Beihang University, Beijing 100191, China
Aiming at the DZ125 and DZ406 superalloys used in aero-engine turbine blades, a thermal barrier coating system (TBCs) consisting of the rare earth oxide modified zirconia topcoat and platinum modified aluminide (PtAl) bondcoat was applied, and the preparation process and high temperature performance were studied. The PtAl bondcoat was prepared by electroplating platimum followed by vapor aluminizing treatment. Effects of key process parameters such as plating pretreatment, thicknesses of Pt, and aluminizing temperature on the microstructure and high-temperature oxidation resistance of the PtAl coating were studied. The results shows that the PtAl bonadcoat prepared by optimized process has excellent oxidation resistance at 1150 ℃. On the surface of the PtAl bondcoat, rare earth oxide modified zirconia (GYb–YSZ) ceramic topcoat were prepared by electron beam physical vapor deposition (EB–PVD). The thermal cycling lifetime of the GYb–YSZ/PtAl TBCs at 1050 ℃ is beyond 720 h (4320 times thermal cycling), indicating that the GYb–YSZ/PtAl TBCs have good performance.
2023, 
