The Effect Analysis of Carbon Fiber Length on Electromagnetic Interference Shielding Performance of Carbon Fiber Composite Paper
LONG Xueli1, LU Zhaoqing1,2,*, WANG Ruanyu1, JIA Fengfeng1,*, LI Siqi1, HUANG Tao1, XU Mingyuan1
1 College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China 2 Qilu Univerisity of Technology (Shandong Academy of Science), Jinan 250353, China
Abstract: Carbon fiber paper-based electromagnetic shielding material was fabricated by paper-forming process using asphalt-based ultra-fine carbon fiber as conductive network skeleton, and electromagnetic wave loss agent, aramid fibrid as auxiliary forming slurry and aramid short fiber as reinforcing slurry. The effects of asphalt-based ultra-fine carbon fiber length on the microstructure, mechanical properties and electromagnetic shielding properties of carbon fiber paper-based materials were investigated. The results shown that the carbon fiber paper-based electromagnetic shielding material possessed the best mechanical properties when the length of the raw carbon fiber is 5 mm and the content is 45wt%, whose tensile strength reaches 38.9 kN/m and the breaking strength reaches 19 MPa. When the length of the raw carbon fiber was 3 mm and the content was 45wt%, the electromagnetic shielding performance of the prepared carbon fiber/aramid fiber paper-based electromagnetic shielding material was the best, and the total electromagnetic shielding effectiveness reached 22.25 dB. High temperature hot pressing treatment shown that the total shielding effectiveness of paper-based materials with different carbon fiber content can be improved about 5.91 dB under the conditions of temperature 240 ℃ and pressure 10 MPa for 5 minutes.
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