Design of Lightweight Exfoliated Graphite Based Thin Composites for EMI Shielding

2018 IEEE MTT-S International Microwave and RF Conference (IMaRC) Pub Date : 2018-11-01 DOI:10.1109/IMaRC.2018.8877128

Vishal Kumar Chakradhary, Jitendra Tahalyani, M. Akhtar

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引用次数: 3

Abstract

In this work, the design of novel exfoliated graphite (EG) powder based lightweight composites for effective EMI shielding of sensitive electronic instruments, used quite often in various civil and military applications, is proposed. The EG powder in the present situation is synthesized using the microwave assisted chemical intercalation of natural graphite flakes. Further, to study the EMI shielding properties, the EG composites of various concentration (2, 4, 6 and 8 wt.% epoxy) are prepared using the ultrasonication method. The EMI shielding effectiveness is measured with the help of a network analyzer by placing these composite samples in the X-band waveguide. It is observed that 1 mm (~ λ/30) thin EG composite at 6 wt.% epoxy shows EMI shielding effectiveness of more than 22 dB over the complete X band. As the EG powder added into the epoxy is at very low concentration, hence the resultant composite is quite lightweight thus making it suitable for even aerospace applications. The proposed EG composites may thus potentially be used for various EMI shielding applications where the lower filler concentration, lightweight and low thickness is the prime consideration.

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电磁干扰屏蔽用轻质剥落石墨基薄复合材料的设计

在这项工作中，提出了一种新型的片状石墨(EG)粉末基轻质复合材料的设计，用于有效屏蔽各种民用和军事应用的敏感电子仪器的电磁干扰。采用微波辅助天然石墨片的化学插层法制备了现有的EG粉体。为了研究电磁干扰屏蔽性能，采用超声法制备了不同浓度环氧树脂(2、4、6、8 wt.%)的EG复合材料。在网络分析仪的帮助下，通过将这些复合样品放置在x波段波导中来测量电磁干扰屏蔽效果。在6 wt.%环氧树脂下，1 mm (~ λ/30)薄EG复合材料在整个X波段显示出超过22 dB的电磁干扰屏蔽效果。由于添加到环氧树脂中的EG粉末浓度非常低，因此合成的复合材料非常轻，因此甚至适用于航空航天应用。因此，所提出的EG复合材料可能潜在地用于各种EMI屏蔽应用，其中较低的填料浓度，轻质和低厚度是主要考虑因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE MTT-S International Microwave and RF Conference (IMaRC)

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