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Effect of Low Temperature Degradation on Tribological Properties of YSZ Thermal Barrier Coatings |
ZHOU Wenhui1, SONG Jian1, CHEN Zehao1( ), YANG Lanlan2, WANG Jinlong1, CHEN Minghui1, ZHU Shenglong1,3, WANG Fuhui1,3 |
1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China 2.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China 3.China Laboratory of Corrosion and Protection, Institute of Matel Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract During in flight and grounded in port in marine environments, aero engine may experience high temperature and low temperature water vapor cycles, thus thermal barrier coatings should be suffered simultaneously from serious frictional wear during service, as well as hydrothermal corrosion aging at lower temperature during grounded in port, therefore, it seems to be intensively concerned how the low temperature hydrothermal aging affects the tribological performance of the TBCs. Hence, 8YSZ top-coat and NiCrAlY bond-coat were successively deposited on the single crystal superalloy N5 by APS, i.e., TBCs were constructed on the alloy surface. Then the frictional performance of the low temperature hydrothermal corrosion aged TBCs was assessed by means of MFT-5000 friction and wear tester, SEM and XRD. The results indicated that hydrothermal corrosion aging of the YSZ ceramic results in the occurrence of transformation from tetragonal phase to monoclinic phase, and the monoclinic phase mainly initiates at zirconia grain boundary, as a consequence, the cohesion of precipitated ZrO2 grains, and the wear resistance of the top coat would be gradually degraded. Slice delamination caused by brittle fracture was observed on the surface of the ceramic coating after long-term alternating corrosion degeneration or high termperature oxidation. Abrasive wear and adhesive wear were also found on the surface of the coatings. The wear mechanism of the low temperature hydrothermal corrosion aged coatings was microfracture, which induced by the exfoliation of YSZ grains.
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Received: 15 March 2022
32134.14.1005.4537.2022.075
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Fund: National Natural Science Foundation of China(51801021);Ministry of Industry and Information Technology Project(MJ-2017-J-99);Fundamental Research Funds for the Central Universities(N2102015) |
About author: CHEN Zehao, E-mail: Chenzehao@mail.neu.edu.cn
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