High-entropy (Ho0.2Y0.2Dy0.2Gd0.2Eu0.2)2Ti2O7/TiO2 composites with excellent mechanical and thermal properties |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;3. Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;4. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 102206, China;1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Henan Zhulin Refractories Co., Ltd., Zhulin Town, Gongyi City, Henan Province, China;3. Wugang Refractory Co., Ltd, Qingshan District, Wuhan 430082, China;1. Anhui Key Laboratory of Low-Temperature Co-Fired Material, Huainan Engineering Research Center for Fuel Cells, Huainan Normal University, Huainan 232001, PR China;2. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, PR China;1. Department of Materials Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;2. Research Center for Functional Materials, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan;3. Department of Mechanical Science and Bioengineering, Osaka University, 1-3 Machikaneyamacho, Toyonaka, Osaka 560-8531, Japan;1. College of Physics, Sichuan University, Chengdu 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China;3. Institute for Advanced Study, Chengdu University, Chengdu 610106, China;4. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, China |
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| Abstract: | High-performance ceramics with low thermal conductivity, high mechanical properties, and idea thermal expansion coefficients have important applications in fields such as turbine blades and automotive engines. Currently, the thermal conductivity of ceramics has been significantly reduced by local doping/substitution or further high-entropy reconfiguration of the composition, but the mechanical properties, especially the fracture toughness, are insufficient and still need to be improved. In this work, based on the high-entropy titanate pyrochlore, TiO2 was introduced for composite toughening and the high-entropy (Ho0.2Y0.2Dy0.2Gd0.2Eu0.2)2Ti2O7-xTiO2 (x = 0, 0.2, 0.4, 1.0 and 2.0) composites with high hardness (16.17 GPa), Young's modulus (289.3 GPa) and fracture toughness (3.612 MPa·m0.5), low thermal conductivity (1.22 W·m−1·K−1), and thermal expansion coefficients close to the substrate material (9.5 ×10−6/K) were successfully prepared by the solidification method. The fracture toughness of the composite toughened sample is 2.25 times higher than that before toughening, which exceeds most of the current low-thermal conductivity ceramics. |
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| Keywords: | High-entropy composites Pyrochlore Melt solidification Composite toughening Mechanical properties Thermal properties |
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