A simple non-destructive method to indicate the spallation and damage degree of the double-ceramic-layer thermal barrier coating of La2(Zr0.7Ce0.3)2O7 and 8YSZ:Eu |
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| Authors: | Sumei Zhao Yu Zhao Ling Zhu Lijian Gu Wenzhi Huang Xizhi Fan Binglin Zou Ying Wang Xueqiang Cao |
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| Affiliation: | 1. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;3. Department of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China |
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| Abstract: | Double-ceramic-layer (DCL) thermal barrier coatings (TBCs) of La2(Zr0.7Ce0.3)2O7 (LZ7C3) and Eu3+-doped zirconia, which was partially stabilised by 8 wt% yttria (8YSZ:Eu), were prepared by atmospheric plasma spraying. A thermal cycling test was carried out. The 8YSZ:Eu sublayer exposed during thermal cycling could produce visible luminescence under ultraviolet (UV) illumination, providing an indication of the spallation and damage degree of the coating. The result shows that the application of a Eu3+-doped luminescence sublayer can be a very simple and useful non-destructive technique to indicate the spallation and damage degree of DCL coatings. |
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| Keywords: | Thermal barrier coatings Self-indicating Luminescence sublayer Non-destructive technique |
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