Effect of water vapour on preferential orientation of thermally grown oxide at 1050 °C

被引：4
|
作者：
Li, Chao [1 ]
Li, Dingjun [3 ]
Yuan, Xiaohu [3 ]
Song, Peng [1 ,2 ]
Feng, Jing [1 ]
Huang, Taihong [1 ]
Lu, Jiansheng [1 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China
[2] Kunming Univ Sci & Technol, Fac Civil Aviat & Aeronaut, Kunming 650093, Peoples R China
[3] Dongfang Elect Corp Dongfang Turbing Co Ltd, State Key Lab Long Life High Temp Mat, Deyang 618000, Peoples R China
来源：
CORROSION SCIENCE | 2022年 / 209卷
关键词：
Thermal Barrier Coating; Electron Backscattering Diffraction; Nanoindentation; Thermally Grown Oxide; Grain Orientation; MCRALY BOND COAT; OXIDATION BEHAVIOR; BARRIER COATINGS; HIGH-TEMPERATURE; THIN-FILMS; ALLOYS; TBC; COEFFICIENT; EXPANSION; NANO;
D O I：
10.1016/j.corsci.2022.110737
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crystal structure and hardness of thermally grown oxide (TGO) layer formed on a NiCoCrAlY bond coat in thermal barrier coatings (TBCs) prepared by electron-beam physical vapor deposition were studied. The hardness and the relationship between the crystal structure and defects depended on the oxidising atmosphere. The presence of excess water vapour during high-temperature oxidation promoted the transformation of delta- to alpha-Al2O3. The TGO layer formed in water vapour environments exhibited higher hardness and fewer defects than that formed in air. These results offer an opportunity to design the long-lifetime TBCs. Furthermore, the grain orientation of the TGO layer was affected by the presence of water vapour; the preferential orientation of alumina was < 0 0 1 > in air + water vapour environment.
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页数：7
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