Seidel Rafael, Katzer Konrad, Bieck Jakob, Langer Maurice, Hesselbach Julian, Heilig Michael
Fraunhofer Institute of Material and Beam Technology IWS, 01277 Dresden, Germany.
SKZ-German Plastics Center, 97076 Wuerzburg, Germany.
Materials (Basel). 2024 Jan 5;17(2):280. doi: 10.3390/ma17020280.
The effect of carbon-based additives on adhesives and potting compounds with regard to electrical conductivity and electromagnetic interference (EMI) shielding properties is of great interest. The increasing power of wireless systems and the ever-higher frequency bands place new demands on shielding technology. This publication gives an overview of the effect of carbon-based fillers on electrical conductivity, electromagnetic shielding properties, and the influence of different fillers and filler amounts on rheological behavior. This work focuses on carbon black (CB), recycled carbon fibers (rCF), carbon nanotubes (CNTs), and complex nanomaterials. Therefore, silicon samples with different fillers and filler amounts were prepared using a dual asymmetric centrifuge and a three-roll mill. It has been found that even with small filler amounts, the electromagnetic shielding properties were drastically raised. The filler content as well as the dispersion technique have a significant influence on most of the fillers. It has also been found that the complex viscosity is strongly influenced by the dispersion technique as well as by the choice and amount of filler. In the experiments carried out, shielding values of over 20 dB were achieved with several fillers, whereby even 43 dB were reached with complex, pre-crosslinked fillers. This signal reduction of up to 99.99% enables almost complete shielding of the related frequency.
碳基添加剂对胶粘剂和灌封料的导电性及电磁干扰（EMI）屏蔽性能的影响备受关注。无线系统功率的不断增加以及频段的日益提高，对屏蔽技术提出了新的要求。本出版物概述了碳基填料对导电性、电磁屏蔽性能的影响，以及不同填料和填料用量对流变行为的影响。这项工作聚焦于炭黑（CB）、回收碳纤维（rCF）、碳纳米管（CNT）和复合纳米材料。因此，使用双不对称离心机和三辊研磨机制备了含有不同填料和填料用量的硅样品。研究发现，即使填料用量很少，电磁屏蔽性能也会大幅提高。填料含量以及分散技术对大多数填料都有显著影响。还发现，复数粘度受分散技术以及填料的选择和用量的强烈影响。在进行的实验中，几种填料实现了超过20 dB的屏蔽值，其中复合的预交联填料甚至达到了43 dB。这种高达99.99%的信号降低几乎能够完全屏蔽相关频率。
