Microstructural evolution and microwave transmission/absorption transition in polymer-derived SiOC ceramics |
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| Affiliation: | 1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Haidian District, Beijing, 100081, China;2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, China;1. Spectroscopy Department, Physics Research Institute, National Research Center, 12311, 33 Elbehouth st., Dokki, Cairo, Egypt;2. Department of Physics, Faculty of Science, Mansura University, Mansoura, 35516, Egypt;1. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, People''s Republic of China;2. College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, People''s Republic of China;3. The Key Lab of Industrial Textile Material and Manufacturing Technology, Zhejiang Province, Hangzhou, 310018, People''s Republic of China;4. Zhejiang Jinda New Materials Co., Ltd., Zhejiang Province, Haining, 314419, People''s Republic of China;1. Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA;2. Department of Mechanical Engineering, University of Delaware, Newark, DE, 19716, USA;3. Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19715, USA;4. Center for Composite Materials, University of Delaware, 101 Academy Street, Newark, DE, 19716, USA;1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China;2. Laboratory for High Performance Transparent Protective Materials of Jiangsu Province, Jiangsu Tiemao Glass Co., Ltd., Nantong, 226600, PR China |
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| Abstract: | Herein, we present the structural evolution of polymer-derived SiOC ceramics with the pyrolysis temperature and the corresponding change in their microwave dielectric properties. The structure of the SiOC ceramics pyrolyzed at a temperature lower than 1200 °C is amorphous, and the corresponding microwave complex permittivity is pretty low; thus, the ceramics exhibit wave transmission properties. The Structural arrangement of free carbon in the SiOC ceramics mainly happens in the temperature range of 1200 °C-1300 °C due to the separation from the Si–O–C network and graphitization, while the structural arrangement of the Si-based matrix mainly occurs in the range of 1300 °C-1400 °C owing to the separation of SiC4 from the Si–O–C network to form nanocrystalline SiC. In pyrolysis temperature range of 1200 °C-1400 °C, the microwave permittivity of SiOC shows negligible change. At a pyrolysis temperature exceeding 1400 °C, the carbothermal reaction of free carbon and the Si–O backbone becomes significant, leading to the formation of crystalline SiC. The as-formed SiC and residual defective carbon improve the polarization loss of SiOC ceramics. In this case, the SiOC ceramics show significantly increased complex permittivity, exhibiting electromagnetic absorption characteristics. These characteristics promote the application of polymer-derived SiOC ceramics to high-temperature electromagnetic absorption materials. |
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| Keywords: | Polymer-derived ceramics Microwave dielectric properties Structural evolution |
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