Enhanced microwave shielding effectiveness and suppressed reflection of chopped carbon fiber felt by electrostatic flocking of carbon fiber
Enhanced microwave shielding effectiveness and suppressed reflection of chopped carbon fiber felt by electrostatic flocking of carbon fiber
复制标题
通过碳纤维静电植绒增强短切碳纤维毡的微波屏蔽效能并抑制反射
DOI：
10.1016/j.compositesa.2020.106099
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发表时间：
2020-12-01
影响因子：
8.7
通讯作者：
Zhang, Zuoguang
中科院分区：
文献类型：
--
作者：
Chen, Xiaoyan;Gu, Yizhuo;Zhang, Zuoguang
本工作制备了X波段(8.2-12.4 GHz)吸收为主、低反射的微波屏蔽材料。利用静电植绒技术，将短切碳纤维(CFs)垂直排列在短切碳纤维毡上，并选择环氧树脂作为支撑这种结构的基质。短切碳纤维的垂直排列有效地减少了表面反射，使微波在碳纤维屏蔽结构内部穿透和消散。将不同长度的沥青基碳纤维植绒在不同植绒密度的聚丙烯腈基碳纤维毡上。结果表明，将28.5g/m2的8 mm CFS植绒在CF毡上后，其平均反射率(0.4dB)比CF毡降低了95%，平均屏蔽效能(32.3dB)和吸收率(31.9dB)分别提高了25%和85%。这种改善归功于多层协同屏蔽机制，其中簇状CFS之间的内部多次反射和四分之一波长衰减起着至关重要的作用。
This work fabricated absorption-dominated and low reflection microwave shielding material in X band (8.2-12.4 GHz). Short chopped carbon fibers (CFs) were aligned vertically on short chopped CF felt with the help of electrostatic flocking technique, and epoxy resin was chosen as matrix to support such structure. Vertical alignment of chopped CFs efficiently reduces surficial reflection to let microwave penetrate and be dissipated inside the shielding structure of CF. Pitch-based CFs with different length were flocked on polyacrylonitrile-based CF felt with different flocking density. It showed that after 28.5 g/m(2) of 8 mm CFs being flocked on CF felt, the average reflection (0.4 dB) decreases by 95% compared to CF felt, while the average shielding effectiveness (32.3 dB) and absorption (31.9 dB) increase by 25% and 85% respectively. Such improvement is attributed to multi-cooperated shielding mechanism, in which internal multi-reflection among flocking CFs and quarter-wavelength attenuation play essential roles.