【摘 要】
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To meet the needs of preventing information leakage in space engineering and military industry,an efficient method was introduced to obtain layered electromagnetic shielding sealing rubber.The carbon fiber,Ni-Fe coating,and Carbon NanoTube (CNT) were comb
【机 构】
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Department of Materials Science,Fudan University,Shanghai 200433,China
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To meet the needs of preventing information leakage in space engineering and military industry,an efficient method was introduced to obtain layered electromagnetic shielding sealing rubber.The carbon fiber,Ni-Fe coating,and Carbon NanoTube (CNT) were combined by chemical plating and in-situ polymerization to obtain a lightweight (0.14 g/cm2) and thin (1 mm thick) Car-bon fiber Fabric (CF)/Ni-Fe/CNT/silicone layered electromagnetic shielding composites.The lay-ered material obtained by adjusting the electroless plating time exhibited a high Shielding Efficiency (SE) of 60.2-85.5 dB in the range of 0-4800 MHz,which can be used for aviation elec-tromagnetic shielding.Carbon fibers and carbon nanotubes mainly attenuated electromagnetic waves through absorption loss,while the nickel-iron alloy coating through reflection loss interacted with the magnetic vector of incident ElectroMagnetic (EM) radiation and magnetic dipoles,there-fore,the EM Interference (EMI) shielding composite attenuated EM waves with the “absorption-reflection-absorption” cooperative interaction.Moreover,the flexible fabric substrate adhered with silicone rubber possessed a breaking elongation of 52.3％,which can be utilized as a good sealing material.Simultaneously,the outstanding exothermicity (67.2 ℃ under the applied voltage of 5 V)makes it possible to be applied in electric heating area.The electromagnetic shielding composites prepared in this paper have good potential in the fields of precision electronic equipment and avi-ation systems.
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