Thermal Shock Resistance of APS 8YSZ Thermal Barrier Coatings on Titanium Alloy |
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| Authors: | Shuibing Zeng Yangjia Liu Xizhi Fan Wenzhi Huang Lijian Gu Binglin Zou Xiaolong Chen Zuhair S Khan Ling Zhu Daowu Yang Xueqiang Cao |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, China
2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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| Abstract: | Thermal barrier coatings (TBCs) with a typical 8YSZ ceramic top coat and CoNiCrAlY bond coat were deposited on titanium alloy substrate (Ti-6Al-4V in wt.%) by air plasma spraying. Thermal insulation and thermal shock resistance of the TBCs at different temperatures as well as their failure behavior were investigated. The results showed that the test temperature had a significant effect on thermal shock life of the TBCs. Failure of the TBCs systems was caused by the formation of crack, bond coat oxidation and elemental diffusion. The vertical cracks induced by thermal shock cycles were probably responsible for the enhancement in thermal shock resistance of the TBCs. Furthermore, elemental diffusion had a great effect on the acceleration of the TBCs failure. The TBCs could provide a good thermal protection for the titanium alloy substrate. |
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