Effect of carbon content on electrical,thermal, and mechanical properties of porous SiC ceramics with B4C and C additives |
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| Affiliation: | 1. National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, PR China;2. Postdoctoral Research Center for Material Science and Technology, Harbin Institute of Technology, Harbin 150001, PR China;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, PR China;1. Micron School of Materials Science & Engineering, Boise State University, 1910 University Drive, Boise, ID 83725, USA;2. Department of Chemistry, Carleton College, 1 North College Street, Northfield, MN 55057, USA;1. School of Aircraft Engineering, Nanchang Hangkong University, Nanchang 330063, China;2. Key Laboratory of Nondestructive Testing of Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China;3. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China;4. National Key Laboratory of Thermo-structure Composite Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;5. China Academy of Launch Vehicle Technology, Beijing 100076, China;6. AECC Shenyang Engine Research Institute, Shenyang 110015, China;1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA), 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan;2. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;3. Department of Material Research, Technical Research Institute, Kawasaki Heavy Industries, Ltd., 1-1 Kawasaki, Akashi, Hyogo 673-8666, Japan;4. Graduate School of Business Administration, Hitotsubashi University, 2-1 Naka, Kunitachi, Tokyo 186-8601, Japan;1. Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130022, China;2. Department of Physics and Shenzhen Institute for Quantum Science & Engineering, Southern University of Science and Technology, Shenzhen 518055, China;3. Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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| Abstract: | The electrical, thermal, and mechanical properties of porous SiC ceramics with B4C-C additives were investigated as functions of C content and sintering temperature. The electrical resistivity of porous SiC ceramics decreased with increases in C content and sintering temperature. A minimal electrical resistivity of 4.6 × 10?2 Ω·cm was obtained in porous SiC ceramics with 1 wt% B4C and 10 wt% C. The thermal conductivity and flexural strength increased with increasing sintering temperature and showed maxima at 4 wt% C addition when sintered at 2000 °C and 2100 °C. The thermal conductivity and flexural strength of porous SiC ceramics can be tuned independently from the porosity by controlling C content and sintering temperature. Typical electrical resistivity, thermal conductivity, and flexural strength of porous SiC ceramics with 1 wt% B4C-4 wt% C sintered at 2100 °C were 1.3 × 10?1 Ω·cm, 76.0 W/(m·K), and 110.3 MPa, respectively. |
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| Keywords: | Silicon carbide Porous ceramics Carbon content Electrical resistivity Flexural strength |
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