Enhancement of the microwave absorption properties of PyC-SiCf/SiC composites by electrophoretic deposition of SiC nanowires on SiC fibers |
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| Affiliation: | 1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;2. School of Physics and Electronics, Central South University, Changsha 410083, China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, PR China;4. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou 412008, China;5. Institut für Materialwissenschaft, Technische Universität Darmstadt, Otto-Berndt-Straße 3, Darmstadt D-64287, Germany;6. College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China;7. College of Materials, Fujian Key Laboratory of Advanced Materials (Xiamen University), Xiamen 361005, China;1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, Shaanxi 710021, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;1. Beijing Xinfeng Aerospace Equipment Co., Ltd, Beijing 100854, PR China;2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, PR China;1. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| Abstract: | The employment of coating technique on the silicon carbide fibers plays a pivotal role in preparing SiC fiber-reinforced SiC composites (SiCf/SiC) toward electromagnetic wave absorption applications. In this work, SiC nanowires (SiCNWs) are successfully deposited onto the pyrolytic carbon (PyC) coated SiC fibers by an electrophoretic deposition method, and subsequently densified by chemical vapor infiltration to obtain SiCNWs/PyC-SiCf/SiC composites. The results reveal that the introduction of SiCNWs could markedly enhance the microwave absorption properties of PyC-SiCf/SiC composites. Owing to the increasing of SiCNWs loading, the minimum reflection loss of composites raises up to −58.5 dB in the SiCNWs/PyC-SiCf/SiC composites with an effective absorption bandwidth (reflection loss ≤ −10 dB) of 6.13 GHz. The remarkable enhancement of electromagnetic wave absorption performances is mainly attributed to the improved dielectric loss ability, impedance matching and multiple reflections. This work provides a novel strategy in preparing SiCf/SiC composites with excellent electromagnetic wave absorption properties. |
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| Keywords: | Silicon carbide fiber/silicon carbide composites Silicon carbide/pyrolytic carbon coating Microwave absorption Electrophoretic deposition SiC nanowires |
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