Influence of Single Layer-Thickness on Residual Thermal Stresses in Sm_2Zr_2O7/YSZ Thermal Barrier Coatings

摘要

In this paper, influence of single-layer thickness on residual stresses in Sm_2Zr_2O_7/YSZ thermal barrier coating was analyzed by finite element method. Results show that the radial stress remains stable in x range 0-12mm, and it decreases abruptly at edge of the sample. The distribution of axial stress resembles that of radial stress, the shear stress increase abruptly at edge of sample. In three typical residual stresses, radial stress has the highest value, axial stress and shear stress can be ignored. The best thickness combination of Sm_2Zr_2O_7/YSZ TBCs should be 0.1mm-NiCoCrAlY layer, 0.05-0.1mm -TGO, 0.1mm-YSZ and 0.9mm-Sm_2Zr_2O_7.