Enhancing thermal insulation and mechanical strength of porous ceramic through size-graded MA Hollow Spheres |
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| Affiliation: | 1. Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, 610207, China;2. MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China;3. Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;1. Department of Physics, Physics and Chemistry of Materials Laboratory University of M''sila, 28000, M''sila, Algeria;2. Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 01, 19000, Setif, Algeria;3. Applied Sciences Department, University of Technology- Iraq, Baghdad, Iraq;4. Laboratoire Moltech Anjou Universite d’Angers/UMR CNRS 6200, 2, Bd Lavoisier, 49045, Angers, France;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China;2. Department of Aeronautical Structure Engineering, School of Aeronautics, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China;3. School of Materials Science and Engineering, Chang''an University, Xi''an, Shaanxi, 710064, PR China;1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, 610031, PR China;2. Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, Sichuan, 610031, PR China;3. Global R&D Center, Guangxi Liugong Machinery Co., Ltd, Guangxi, 545007, PR China |
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| Abstract: | In this study, a series of porous ceramics were prepared using different ratios of small and large size MA hollow ceramic spheres as pore-forming agents, and their thermal insulation properties were investigated. The results showed that increasing the proportion of small size hollow ceramic spheres could effectively decrease the thermal conductivity and improve the compressive strength of the porous ceramics. The optimal porous ceramic was prepared with a ratio of 10∼50 of small and large size hollow ceramic spheres, which had a thermal conductivity of 0.368 W/(m·K) at 800 °C and a compressive strength of 22.43 MPa. Microscopic analysis indicated that the enhanced thermal insulation and mechanical properties were due to the improved pore structure and the enhanced bonding strength between the ceramic spheres and the matrix. The findings provide valuable insights for the development of high-performance thermal insulation materials. |
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| Keywords: | MA hollow spheres Porous ceramics Thermal conductivity Mechanical property |
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