| Thermally Grown Oxide의 고온 크리프에 따른 열차폐 코팅의 잔류응력 분포에 관한 유한요소해석 |
| 장중철, 최성철 |
| 한양대학교 신소재공학과 |
| Numerical Simulation for Residual Stress Distributions of Thermal Barrier Coatings by High Temperature Creep in Thermally Grown Oxide |
| Jung-Chel Jang, Sung-Churl Choi |
| Department of Material Science and Engineering, Hanyang University |
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| ABSTRACT |
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The residual stress changes on thermo-mechanical loading in the interface region of the Thermal Barrier Coating (TBC)/Thermally Grown Oxide (TGO)/Bond Coat (BC) were calculated on the TBC-coated superalloys using a Finite Element Method (FEM). It was found that the residual stress of the interface boundary was dependent upon mainly the oxide formation and the swelling rate of the oxide by creep relaxation. During an oxide swelling, the relaxation of residual stress which is due to creep deformation increased the TBC's life. In the case of the fine grain size of TGO scale, the TBC stresses piled up by oxide swelling could be relaxed by diffusional creep effect of TGO. |
| Key words:
Thermal barrier coatings, TGO, Numerical simulation, Creep |
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