Carbothermal reduction synthesis of high porosity and low thermal conductivity ZrC-SiC ceramics via an one-step sintering technique |
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| Affiliation: | 1. Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, 450052 Zhengzhou, China;2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, EX4 4QF Exeter, UK;1. Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Germany;2. Institute of Ceramics, Refractories and Composite Materials, TU Bergakademie Freiberg, Germany;3. Institute of material Science, TU Bergakademie Freiberg, Germany;1. Henan Key Labortary of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, 450052, Zhengzhou, China;2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, EX4 4QF, Exeter, UK;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Jiangxi Guo Chuang Industrial Park Development Co., Ltd., Ganzhou 341000, China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, PR China;4. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, PR China;1. Department of Materials Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France;4. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden;1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China;2. Xianghu High Tech Application Research Institute, Hangzhou 310027, People’s Republic of China;3. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People’s Republic of China;4. State Key Laboratory of Cemented Carbide, Zhuzhou 412000, People’s Republic of China |
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| Abstract: | In this work, porous ZrC-SiC ceramics with high porosity and low thermal conductivity were successfully prepared using zircon (ZrSiO4) and carbon black as material precursors via a facile one-step sintering approach combining in-situ carbothermal reduction reaction (at 1600 °C for 2 h) and partial hot-pressing sintering technique (at 1900 °C for 1 h). Carbon black not only served as a reducing agent, but also performed as a pore-foaming agent for synthesizing porous ZrC-SiC ceramics. The prepared porous ZrC-SiC ceramics with homogeneous microstructure (with grain size in the 50–1000 nm range and pore size in the 0.2–4 µm range) possessed high porosity of 61.37–70.78%, relatively high compressive strength of 1.31–7.48 MPa, and low room temperature thermal conductivity of 1.48–4.90 W·m?1K?1. The fabricated porous ZrC-SiC ceramics with higher strength and lower thermal conductivity can be used as a promising light-weight thermal insulation material. |
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| Keywords: | Ultra-high temperature ceramics Porous ZrC-SiC ceramics Carbothermal reaction Partial hot-pressing sintering Thermal conductivity |
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