高温处理对活性炭纤维毡电磁屏蔽性能的影响

Effect of High-Temperature Treatment on Electromagnetic Shielding Performance of Activated Carbon Fiber Felt

为制备出一种柔性、轻质、高效的电磁屏蔽材料,以密度为0.055 g/cm^(3)的活性炭纤维毡(ACF)为原料,研究了氩气气氛高温处理对ACF微观结构和电磁屏蔽性能的影响;借助X射线衍射、Raman光谱及扫描电子显微镜观察和检测了材料的微观结构和物相组成,采用矩形波导法测试了试样在8.2~12.4 GHz频率范围内的电磁参数。结果表明:高温处理可以提高ACF中碳的有序化程度。经高温处理后的ACF与处理前相比,其电导率和电磁屏蔽效能均得到提高,其中1400℃高温处理后的ACF,总的电磁屏蔽效能达到39 dB,比原始ACF(~16 dB)提高了23 dB,表明高温处理可明显改善ACF的电磁屏蔽性能。

A flexible,lightweight and efficient electromagnetic shielding material was prepared with activated carbon fiber felt(ACF)with the density of 0.055 g/cm^(3).The phase compositions and micro-morphology were characterized by X-ray diffraction and scanning electron microscopy,respectively.The electromagnetic parameters of samples at 8.2-12.4 GHz were examined by a rectangular waveguide method.The results show that high-temperature treatment can improve the degree of carbon ordering in ACF.The conductivity and electromagnetic shielding efficiency of ACF are improved after high-temperature treatment.The total electromagnetic shielding effectiveness of ACF is 39 dB after high-temperature treatment at 1400℃,which is 23 d B greater than that of the raw material of ACF(i.e.,16 dB).It is indicated that high-temperature treatment could improve the electromagnetic shielding performance of ACF.