Microstructure and thermal shock resistance of AlBOw- and BNw-whisker-modified thermal barrier coatings |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory for Manufacturing System Engineering and Key Laboratory of Photonics Technology for Information of Shaanxi Province, Xi’an Jiaotong University, Xi’an 710049, China;3. School of Materials Engineering, Xi’an Aeronautical University, Xi’an 710077, China;1. School of Energy and Power Engineering, North University of China, Taiyuan, 030051, PR China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, PR China;3. Wuzhong Instrument Co. Ltd, Wu Zhong, 751100, China;1. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 2683-8522, Japan;2. Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 2683-8522, Japan;3. Production Technique Department, Tokyo Plant, TOCALO Co.,Ltd., 1-1-1 Gyoda, Funabashi, Japan;4. R&D Laboratories, TOCALO Co.,Ltd., 14-3 Minamifutami, Futami-Cho, Akashi, Japan;1. School of Mechanical Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin, 300401, China;2. Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, No. 2898, Jinbei Road, Dongli District, Tianjin, 300300, China |
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| Abstract: | To improve the crack propagation resistance of YSZ thermal barrier coatings during the thermal cycle, three kinds of thermal barrier coatings were prepared by atmospheric plasma spraying: YSZ, AlBOw-modified YSZ and BNW-modified YSZ. SEM, EDS and XRD were used to analyse the morphology, composition and phase composition of the sprayed powder and coating section. The phase structures of the YSZ, YSZ+AlBOw and YSZ+BNw coatings were t' phase. The cross-section of the coating presents a layered structure with pores inside. The porosity values of the YSZ, YSZ+AlBOw and YSZ+BNw coatings are 10.33%, 14.17% and 12.52%, respectively. The thermal shock resistance of three groups of coatings after 5 min at 1000 °C was analysed. The failure behaviour of the coatings after several thermal cycles was studied. The results show that the thermal shock resistance of the coatings with AlBOw is slightly lower than that of the YSZ coatings. The thermal shock resistance of the BNw coatings is 62.2% higher than that of the YSZ coatings. The whisker inhibits the crack propagation and prolongs the life of the coatings via crack deflection, whisker pull-out and whisker bridging. |
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| Keywords: | Thermal barrier coating Whisker modification Porosity Thermal shock performance |
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