Thermal cycling failure of new LaMgAl11O19/YSZ double ceramic top coat thermal barrier coating systems |
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| Authors: | Xiaolong Chen Yu Zhao Xizhi FanYangjia Liu Binglin ZouYing Wang Hongmei MaXueqiang Cao |
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| Affiliation: | a State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Chinab Graduate School of the Chinese Academy of Sciences, Beijing 100049, Chinac Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science & Technology, Changsha, 410004, China |
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| Abstract: | New LaMgAl11O19 (LaMA)/YSZ double ceramic top coat thermal barrier coatings (TBCs) with the potential application in advanced gas-turbines and diesel engines to realize improved efficiency and durability were prepared by plasma spraying, and their thermal cycling failure were investigated. The microstructure evolutions as well as the crystal chemistry characteristics of LaMA coating which seemed to have strong influences on the thermal cycling failure of LaMA and the new double ceramic top coat TBCs based on LaMA/YSZ system were studied. For double ceramic top coat TBC system, interface modification of LaMA/YSZ by preparing thin composite coatings seemed to be more preferred due to the formations of multiple cracks during thermal cycling making the TBC to be more strain tolerant and as well as resulting in an improved thermal cycling property. The effects of the TGO stresses on the failure behavior of the TBCs were discussed through fluorescence piezo-spectroscopy analysis. |
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| Keywords: | Thermal barrier coatings Magnetoplumbite Zirconia Plasma spraying Thermal cycling |
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