Thermo-mechanical stress analyses of solid oxide fuel cell anode based on three-dimensional microstructure reconstruction |
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Affiliation: | 1. College of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China;2. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;1. Kyoto University, Department of Aeronautics and Astronautics, Kyoto, Japan;2. AGH University of Science and Technology, Faculty of Energy and Fuels, Krakow, Poland;1. Nigde University, Mechanical Engineering Department, 51245, Nigde, Turkey;2. Abdullah Gul University, Mechanical Engineering Department, 38039, Kayseri, Turkey;3. Meliksah University, Mechanical Engineering Department, 38280, Kayseri, Turkey;4. International Association for Hydrogen Energy, Miami University, Miami, USA;1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;2. CREST, JST, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan |
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Abstract: | During high-temperature operation of a solid oxide fuel cell, the stresses caused by mismatch of thermal expansion coefficients between different materials and external mechanical loads may cause the rising of damage risk of nickel-yttria-stabilized zirconia anode. It is quite difficult to quantify the mechanical characteristics of a composite anode without investigating on the stress distribution in its real microstructure. However, the high operating temperature and extremely complex microstructure in micro-scale determine the high difficulty in in-situ measurement of thermo-mechanical stress distribution. In this work, the microstructures of six different anode samples, fabricated by using identical nickel oxide-yttria-stabilized zirconia powder mixture, are reconstructed in three-dimension based on the dual-beam focused-ion-beam-scanning-electron-microscopy. The three-dimensional thermo-mechanical stress distributions of different microstructures are conducted at operating temperature based on the finite element method. The effects of both thermal expansion coefficients mismatch between nickel and yttria-stabilized zirconia and external mechanical loads are analyzed. The mechanical failure probabilities of yttria-stabilized zirconia phase in different reconstructions are estimated based on the obtained stress distributions to investigate the influence of microstructure characterizations on nickel-yttria-stabilized zirconia anode strength. |
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Keywords: | SOFC Stress Thermal expansion Fracture probability |
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