Significantly enhanced electromagnetic interference shielding in Al2O3 ceramic composites incorporated with highly aligned non-woven carbon fibers |
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| Affiliation: | 1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;2. National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China;3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;1. College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu, 610065, China;2. Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;1. Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Microwave Engineering Laboratory, Beihang University, Beijing 100191, China;3. Research Institute of Frontier Science, Beihang University, Beijing 100191, China |
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| Abstract: | Macroscopic parallel aligned non-woven carbon fibers were incorporated into Al2O3 composites in this study to evaluate the contribution of multiple reflections to the total electric magnetic interference (EMI) shielding. Results indicate that parallel aligned non-woven carbon fiber layers contribute significantly to the total EMI shielding effectiveness (SET) of Al2O3 composites by largely enhancing the EMI absorption, and seven parallel aligned thin non-woven carbon fiber layers finally make the almost microwave-transparent Al2O3 an excellent EMI shielding material with an EMI SET as high as 29–32 dB in the X-band frequency range. The volume fraction of carbon fibers in Al2O3 composites with seven carbon fiber layers is calculated to be only 0.5%, and therefore the EMI SE enhancement efficiency by parallel aligned large non-woven carbon fiber layers is much higher than other highly conducting nano fillers. It validates the significance of multiple reflections in achieving high EMI shielding properties in ceramic composites and provides an instructive approach to design efficient EMI shielding ceramic composites. |
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| Keywords: | Non-woven carbon fiber Multiple reflections Electromagnetic interference shielding Dielectric loss |
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