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Effect of the thermally grown oxide and interfacial roughness on stress distribution in environmental barrier coatings
Affiliation:1. Jiangsu Province Key Laboratory of Aerospace Power System, Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;2. Nanjing Forestry University, College of Chemical Engineering, Nanjing 210016, PR China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China;1. College of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China;2. Jiaxing Glead Electronics Co., LTD, Jiaxing, Zhejiang 314003, China;3. Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran 14115–143, Iran;4. Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK;1. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Xiangyang 441000, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou, China;2. Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, Guangdong, China;3. Key Laboratory of Micro-nano Sensing and IoT of Wenzhou, Wenzhou Institute of Hangzhou Dianzi University, Wenzhou 325038, China;4. Qiantang Science and Technology Innovation Center, Hangzhou 310016, China;1. Department of Inorganic and Organic Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain;2. Institute of Nanoscience & Nanotechnology, Universitat de Barcelona, 08028 Barcelona, Spain;3. Department of Inorganic and Organic Chemistry, Universitat Jaume I, 12071 Castelló, Spain;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, PR China;3. Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an, Shaanxi, 710071, PR China
Abstract:To clarify the role of interface morphology and thermally grown oxide (TGO) in the failure of environmental barrier coatings (EBCs). In this study, the effect of chemical expansion on free energy was considered based on the continuous thermodynamic framework. The effects of roughness and TGO growth on the stress distribution of EBCs were investigated. The results showed that the stress coupling effect led to the inhomogeneous growth of TGO by affecting the gas diffusion and gas inflow rate. The TGO thickness at the peak increased with increasing roughness, and the TGO thickness at the valley and the middle position decreased with increasing roughness. The y-direction at the TGO/EBC valley and the TGO/BC peak under tensile stress increased with the TGO thickness and roughness and may be the first to fail in delamination. The calculation results of the model can provide a theoretical basis for the coating design and manufacturing process.
Keywords:Ceramic matrix composites  Environmental barrier coatings  Thermally grown oxide  Stress evolution  Roughness
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