Enhanced electromagnetic shielding property of cf/mullite composites fabricated by spark plasma sintering |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou, 412008, China;3. School of Physics and Electronics, Central South University, Changsha, 410083, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. School of Materials Science and Engineering, Shandong University of Technology, Zibo, 255000, China;3. Center for Composite Materials, Harbin Institute of Technology, Harbin, 150001, China;4. Shandong Industrial Ceramics Research & Design Institute Co., Ltd., Zibo, 255000, China;5. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology (Ministry of Industry and Information Technology), Harbin Institute of Technology, Harbin, 150001, China;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;2. IMDEA Materials Institute, c/Eric Kandel 2, Getafe 28906, Madrid, Spain;3. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081, PR China;2. Hunan Jiashunhua New Material Co., Ltd, Hunan, 100085, PR 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 |
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| Abstract: | Aiming to prepare high-performance electromagnetic interference (EMI) shielding materials, chopped carbon fibers were incorporated into mullite ceramic matrix via rapid prototyping process of spark plasma sintering (SPS). Results indicate that Cf/mullite composites with only 1 wt% of carbon fibers exhibit highest shielding effectiveness (SET) over 40 dB at a small thickness of 2.0 mm, showing great advantages both in terms of performance and thickness compared with many mature carbon/ceramic composites. The high EMI shielding properties mainly depend on two mechanisms of absorption and reflection in this present work. The enhanced absorption and reflection of electromagnetic wave are ascribed to the promotional electrical conductivity arising from the formation of conductive network by introduction of carbon fibers. Regarding enhanced electrical conductivity, notable intensified interfacial polarization on a large number of interfaces between mullite matrix and carbon fibers is also the key factor to the improved absorption, which makes absorption play a dominant role in the significant improvement of EMI SET. The Cf/mullite composites with excellent EMI shielding properties and thin thickness show great potential application as EMI materials. |
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| Keywords: | Carbon fibers Mullite Electromagnetic interference shielding Spark plasma sintering |
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