Microstructure and electromagnetic wave absorption property of reduced graphene oxide-SiCnw/SiBCN composite ceramics |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilong Jiang, Harbin 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin 150080, China;3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;4. Beijing Institute of Control Engineering, Beijing 100094, China;1. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jingshi Road 17923, Jinan 250061, Shandong, China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jingshi Road 17923, Jinan 250061, Shandong, China;1. Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150001, PR China;2. The Institute of Theoretical and Applied Aerodynamics, China Academy of Aerospace Aerodynamics, Beijing 100074, PR China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilong Jiang, Harbin 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin 150080, China;3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;4. Beijing Institute of Control Engineering, Beijing 100094, China |
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| Abstract: | In this account, RGO-SiCnw/SiBCN composite ceramics were fabricated using polymer derived ceramic (PDC) combined with chemical vapor infiltration (CVI) technology. Dielectric property of as-obtained RGO-SiCnw/SiBCN composite ceramics was significantly enhanced thanks to established conductive pathway through overlapped nanoscale SiCnw and micro-sized RGO. The minimum RC of composite ceramics with 0.5 wt% GO and 2.29 wt% SiCnw at thickness of 3.6 mm reached -42.02 dB with corresponding effective absorption bandwidth (EAB) of 4.2 GHz. As temperature rose from 25 to 400 °C, permittivity increased with enhanced charge carrier density and then it decreased due to oxidation process of RGO from 400 to 600 °C. The minimum reflection coefficient (RC) was recorded as -39.13 dB and EAB covered the entire X-band at 600 °C. EMW absorption ability was evaluated after high-temperature oxidation experiment under protective effect of wave-transparent Si3N4 coating. RGO-SiCnw/SiBCN composite ceramics maintained outstanding EMW absorption ability with minimum RC of -10.41 dB after oxidation at 900 °C, indicating RGO-SiCnw/SiBCN composite ceramics with excellent EMW absorption characteristic even at high temperatures and harsh environments. |
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| Keywords: | PDC CVI Dielectric property Electrimagnetic wave absorption characteristic |
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