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- 2018
碳纳米管/平面各向异性羰基铁复合材料的液相共混法制备及其电磁性能
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Abstract:
采用机械球磨法制备了平面各向异性羰基铁（Planar Anisotropic Carbonyl Iron，PACI），然后通过液相共混法制备了碳纳米管（CNTs）/PACI复合材料。采用同轴法测定CNTs/PACI复合材料在2~18 GHz频段内的复介电常数和复磁导率，研究了CNTs掺杂量对复合材料电磁性能的影响。结果表明：CNTs/PACI复合材料相对于PACI具有更高的复介电常数和衰减常数，随着CNTs质量分数的提高，复合材料的复介电常数和衰减常数逐渐增大，特征阻抗则逐渐减小。CNTs掺杂能够有效提高CNTs/PACI复合材料的吸波性能，通过调整厚度和CNTs掺杂量可以对复合材料的吸波性能进行有效调控。厚度为1.2 mm、CNTs质量分数为2wt%和厚度为1.6 mm、CNTs质量分数为0.5wt%的CNTs/PACI复合材料在Ku波段（12~18 GHz）的反射率均小于-10 dB；厚度为2.0 mm、CNTs质量分数为0.5wt%和1wt%的复合材料反射率小于-10 dB的频带宽分别为5.28 GHz（8.24~13.52 GHz）和5.04 GHz（7.52~12.56 GHz），覆盖整个X波段（8~12 GHz）。 The planar anisotropic carbonyl iron (PACI) was firstly fabricated by mechanical ball milling. Then the carbon nanotubes(CNTs)/PACI composite was prepared by solution blending method. The complex permittivity and complex permeability of the samples between 2-18 GHz were measured through coaxial method. The effects of the CNTs doping content on the electromagnetic properties of CNTs/PACI composites were investigated. The results show that the CNTs/PACI composites have higher complex permittivity and attenuation constant compared with PACI.The complex permittivity and attenuation constant of the composites increase gradually with the increasing mass fraction of CNTs (WCNTs), while the microwave impedance decreases gradually. Doping CNTs can effectively improve the microwave absorption properties of CNTs/PACI composites. Through adjusting the thickness (d) and the CNTs doping content, the microwave absorption properties of the composites can be effectively controlled. When d=1.2 mm and WCNTs=2wt%, or d=1.6 mm and WCNTs=0.5wt%, the reflection loss (RL) of CNTs/PACI composite in Ku band (12-18 GHz) is below -10 dB. When d=2.0 mm, WCNTs=0.5wt% and 1wt%, the bandwidth corresponding to the RL of the composites below -10 dB is 5.28 GHz (8.24-13.52 GHz) and 5.04 GHz (7.52-12.56 GHz) respectively, which covering the entire X band (8-12 GHz). 新世纪优秀人才支持计划（NCET-11-0868）；陕西省重点科技创新团队（2014KCT-03）；陕西省自然科学基金（2014JM2-5084）
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