Anti-CMAS corrosion mechanism of Al2O3 pore sealing and laser remelting on thermal barrier coatings |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China;2. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;3. Southwest Technology and Engineering Research Institute, No. 115 Fenglin Road, Jinfeng Town, Jiulongpo District, Chongqing 401329, China;4. Yantai Research Institute of Harbin Engineering University, No. 1 Qingdao Street, Yantai Economic & Technological Development Area, Shandong, PR China;5. Institute of Aero Engine Research, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;1. AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu, China;2. State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China;1. Ural Federal University, Mira str.., Yekaterinburg, Russia;2. Institute of Solid State Chemistry of Ural Branch of Academy Science, 91 Pervomayskaya str., Yekaterinburg, Russia;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;3. Xi’an Xinyao Ceramic Composite Materials Co., Ltd., Xi’an 710117, China;1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, PR China;2. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, PR China |
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| Abstract: | The sol-dip-coating method and surface laser remelting technology are applied to form an Al2O3 layer on a YSZ coating surface to effectively block the environmental sediment CMAS. The behaviour and mechanism for CMAS corrosion of the coating are investigated, and the interfacial reliability of the coating and matrix is calculated by using the Monte Carlo method. The bonding force between the Al2O3 sol and YSZ coating can be effectively improved by laser surface treatment. Samples subjected to a laser pretreatment and posttreatment (YL-AL) of the YSZ coating are found to show the best interfacial bonding strength between Al2O3 and YSZ. Furthermore, the YL-AL sample shows a higher CMAS resistance than the laser posttreatment (Y-AL) samples, which effectively combines the chemical resistance of Al2O3 to CMAS and the physical resistance of the laser re-melted densification layer against CMAS penetration. |
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| Keywords: | Yttria oxide stabilized zirconia (YSZ) CMAS Surface protection Interface reliability calculation Failure process |
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