| WANG Min,LIU Xingyu,CHENG Daolai,YUAN Jianhui.Effect of TGO Morphology and Thickness on Residual Stress of Thermal Barrier Coatings during Thermal Cycling[J],54(6):125-133 |
| Effect of TGO Morphology and Thickness on Residual Stress of Thermal Barrier Coatings during Thermal Cycling |
| Received:April 07, 2024 Revised:July 31, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.06.011 |
| KeyWord:thermal barrier coatings TGO interface morphology thickness residual stress thermal cycling |
| Author | Institution |
| WANG Min |
Shanghai Technical Institute of Electronics & Information, Shanghai , China |
| LIU Xingyu |
Shanghai University of Engineering Sciences, Shanghai , China |
| CHENG Daolai |
Shanghai Technical Institute of Electronics & Information, Shanghai , China |
| YUAN Jianhui |
Shanghai University of Engineering Sciences, Shanghai , China |
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| Abstract: |
| The axial and radial residual stresses on the TGO/bonding coating interface and the TGO/YSZ interface of YSZ/LaMgAl11O19 dual-ceramic layers, caused by changes of the interface morphology and thickness of the TGO during thermal cycling, are simulated with Abaqus finite element software, so as to provide a basis for the failure study of the coatings. Firstly, four spline curves with two wavelengths (30, 60 µm) and two amplitudes (7.5, 15 µm) are established to simulate the interface morphology between YSZ/TGO and TGO/BC layers. Then, the growth of TGO thickness is simulated by changing the material parameters of the corresponding thickness at the interface between the bonding layer and TGO under different cycles. The thickness of TGO is 1 µm at the beginning of thermal cycling, and it changes to 2.4 µm, 3.7, 4.5, 5.1, and 5.6 µm after 10, 30, 50, 70, and 90 thermal cycling, respectively. The temperature changes of points on the top surface of LaMgAl11O19, LaMgAl11O19/YSZ, and YSZ/TGO interfaces under different cycles are tested. The relationship between axial/radial residual stresses and interface morphology of YSZ/TGO under different thermal cycles is analyzed. The axial/radial residual stress changes of points on the TGO/BC interface, which continuously change with the thickness of TGO, under different cycles, as well as the stress changes of the same position during the thermal cycling process, are also studied. After 10 thermal cycles, the peak position of the curve segment with amplitude of 15 µm and a wavelength of 30 µm on the YSZ/TGO interface generates the maximum axial compressive stress of 87.2 MPa and the maximum radial compressive stress of 358.5 MPa. The trough position has the maximum radial tensile stress of 201.4 MPa after 110 thermal cycles. On the left side of the peak of the curve with amplitude of 7.5 µm and a wavelength of 30 µm, the maximum axial tensile stress of 90.3 MPa appears after 10 thermal cycles. At the peak position of the second curve segment on the TGO/BC interface, the maximum axial compressive stress of 89.5 MPa and the maximum radial compressive stress of 336.7 MPa appear after 10 thermal cycles. After 90 thermal cycles, the 5.6 µm-thick TGO has the maximum axial residual tensile stress of 104.7 MPa. The maximum radial tensile stress of 156.2 MPa occurs at the trough position of the first curve segment after 10 thermal cycles. The axial and radial residual stresses of the left-most point on the TGO/BC interface are close to 0 MPa during the holding stage at 1 100 ℃ temperature. Under the 90th thermal cycle, the maximum axial tensile stress is 32.2 MPa, and the compressive stress is 28.7 MPa. The interface morphology and thickness changes of TGO have a significant effect on the residual stress of dual-ceramic coatings during thermal cycling. The peak and trough positions of curves with large amplitudes and short wavelengths are prone to generate the maximum tensile and compressive residual stresses. The maximum radial compressive stress tends to decrease with the increase of thermal cycles and TGO thickness. By controlling the interface morphology and thickness changes of TGO, the failure risk of thermal barrier coatings can be reduced. |
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