Effect of splat-interface discontinuity on effective thermal conductivity of plasma sprayed thermal barrier coating |
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| Affiliation: | 1. Materials Engineering, Indian Institute of Science, Bangalore 56012, India;2. Centre for Laser Processing of Materials, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 50005, India;3. Centre for Thermal Spray Research, Stony Brook University, Stony Brook, NY 11790, USA;1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin, 300072, China;3. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;4. Department of General Education, Army Engineering University of PLA, Nanjing, 211101, China;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, PR China;2. Huangshi HBPU Industrial Technology Research Institute of Environmental Protection and Energy Saving, Huangshi, 435003, PR China;3. School of Materials Science and Engineering, Hubei Polytechnic University, Hubei, 435003, PR China;4. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, PR China;5. School of Chemistry and Chemical Engineering, Hubei Polytechnic University, Hubei, 435003, PR China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China;2. Department of General Education, Army Engineering University of PLA, Nanjing, 211101, PR China |
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| Abstract: | The thermal barrier coating obtained by atmospheric plasma spraying (APS TBCs) has a distinct lamellar microstructure, in which the splats discontinuous interfaces running parallel to the metal/ceramic interface contribute largely to the reduction in the effective thermal conductivity of APS TBCs. The dependency of such contribution on the topological structure of the interface discontinuity is investigated in the present work. Firstly, the concept of discontinuity of splats interfaces was defined to quantify the splats discontinuous interfaces revealed by microscopic observations. Then, the microstructure model with a random distribution of discontinuous interfaces was established by utilizing the finite element simulation method to investigate the effect of interlayer discontinuity on thermal conductivity of the APS TBCs. Finally, an optimal topological structure of the interface discontinuity was found to be responsible for the lowest effective thermal conductivity of the APS TBCs and typical parametrical tendencies demonstrated. |
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| Keywords: | Thermal barrier coatings Plasma spraying Interface discontinuity Thermal conductivity |
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