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Enhanced Shielding Performance of Layered Carbon Fiber Composites Filled with Carbonyl Iron and Carbon Nanotubes in the Koch Curve Fractal Method

机译:Koch曲线分形方法增强了填充有羰基铁和碳纳米管的层状碳纤维复合材料的屏蔽性能

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摘要

Layered carbon fiber composites (CFC) with enhanced shielding effectiveness (SE) were prepared with mixed fillers of carbon nanotubes (CNTs) and carbonyl iron powders (CIPs) in the form of a Koch curve fractal. In the layered composite structure, glass fiber (GF) cloth was used in the wave–transmissive layer (WTL), and the carbon fiber (CF) cloth was used in the supporting layer (SL). Between WTL and SL, CNTs and CIPs were distributed in epoxy resin in the form of a Koch curve fractal to act as an absorbing layer (AL), and copper foil was used as a reflective layer (RL) and bonded at the bottom of the whole composites. The layered structure design and excellent interlayer interface integration obviously improved the SE performance of the CFC. The SE of different samples was investigated, and the results show that, with the increase in the number (n) of Koch curve fractals, the SE of the samples enhanced in the low frequency scope (1–5 GHz). The sample with n = 2 has the highest SE value of 73.8 dB at 2.3 GHz. The shielding performance of the fractal sample filled by CNTs and CIPs simultaneously has a comprehensive improvement in the whole scope of 1–18 GHz, especially for the sample with n = 2. The cumulative bandwidth value of the SE exceeding 55 dB is about 14.3 GHz, accounting for 85% of the whole frequency scope, indicating the composite fabricated in this paper is an electromagnetic shielding material with great prospect.
机译:用科赫曲线分形形式的碳纳米管(CNT)和羰基铁粉(CIP)的混合填料制备了具有增强屏蔽效果(SE)的层状碳纤维复合材料(CFC)。在层状复合结构中,玻璃纤维(GF)布用于波透射层(WTL),碳纤维(CF)布用于支撑层(SL)。在WTL和SL之间,CNT和CIP以Koch曲线分形的形式分布在环氧树脂中,用作吸收层(AL),铜箔用作反射层(RL),并粘结在玻璃的底部。整个复合材料。分层结构设计和出色的层间接口集成明显改善了CFC的SE性能。对不同样品的SE进行了研究,结果表明,随着Koch曲线分形数(n)的增加,样品的SE在低频范围(1-5 GHz)中增强。 n = 2的样本在2.3 GHz时具有最高SE值73.8 dB。同时由CNT和CIP填充的分形样品的屏蔽性能在1-18 GHz的整个范围内都有了全面的提高,特别是对于n = 2的样品。SE的累积带宽值超过55 dB约为14.3 GHz占整个频率范围的85%,说明本文制备的复合材料是一种具有广阔前景的电磁屏蔽材料。

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