Study on thermal shock resistance of Sc2O3 and Y2O3 co-stabilized ZrO2 thermal barrier coatings |
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| Affiliation: | 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063210, PR China;2. College of Sciences, North China University of Science and Technology, Tangshan, 063210, PR China;1. School of Medicine, Anhui University of Science and Technology, Huainan, PR China;2. Center for Orthopaedic Science and Translational Medicine, Department of Orthopaedics, Shanghai Tenth People''s Hospital, School of Medicine, Tongji University, 301 Yanchang Road, Shanghai, 200072, PR China;1. Materials Science & Engineering, Texas A&M University, College Station, TX, United States;2. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH, United States;1. Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo, Zhejiang, 315211, China;2. EngineeringResearch Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo, Zhejiang, 315211, China;3. Institute of Ocean Engineering, Ningbo University, China;4. Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, Leipzig, D–04318, Germany;1. ITMO University, Kronverksky Avenue 49, 197101, Saint-Petersburg, Russia;2. National Research Tomsk Polytechnic University, Lenin Avenue 30, 634050, Tomsk, Russia;3. Saint-Petersburg University, 7/9 Universitetskaya nab., Saint-Petersburg, 199034, Russia |
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| Abstract: | In order to reveal the effect of Sc2O3 and Y2O3 co-doping system on the thermal shock resistance of ZrO2 thermal barrier coatings, Y2O3 stabilized ZrO2 thermal barrier coatings (YSZ TBCs) and Sc2O3–Y2O3 co-stabilized ZrO2 thermal barrier coatings (ScYSZ TBCs) were prepared by atmospheric plasma spraying technology. The surface and cross-section micromorphologies of YSZ ceramic coating and ScYSZ ceramic coatings were compared, and their phase composition before and after heat treatment at 1200 °C was analyzed. Whereupon, the thermal shock experiment of the two TBCs at 1100 °C was carried out. The results show that the micromorphologies of YSZ ceramic coating and ScYSZ ceramic coating were not much different, but the porosity of the latter was slightly higher. Before heat treatment, the phase composition of both YSZ ceramic coating and ScYSZ ceramic coating was a single T′ phase. After heat treatment, the phase composition of YSZ ceramic coating was a mixture of M phase, T phase, and C phase, while that of ScYSZ ceramic coating was still a single T′ phase, indicating ScYSZ ceramic coating had better T′ phase stability, which could be attributed to the co-doping system of Sc2O3 and Y2O3 facilitated the formation of defect clusters. In the thermal shock experiment, the thermal shock life of YSZ TBCs was 310 times, while that of ScYSZ TBCs was 370 times, indicating the latter had better thermal shock resistance. The difference in thermal shock resistance could be attributed to the different sintering resistance of ceramic coatings and the different growth rates of thermally grown oxide in the two TBCs. Furthermore, the thermal shock failure modes of YSZ TBCs and ScYSZ TBCs were different, the former was delamination, while the latter was delamination and shallow spallation. |
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| Keywords: | Thermal barrier coatings T′ phase stability Thermal shock resistance Thermally grown oxide |
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