粒径对纳米炭黑/环氧复合材料微波吸收性能的影响

Sandeep Kumar Singh, A. Kumar Yadav, R. Pal, M. Akhtar, Kamal K. Kar
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引用次数: 2

摘要

将粒径分别为15、25、55和65 nm的纳米炭黑(NCB)添加到环氧基中,研究了粒径对纳米复合材料微波吸收性能的影响。采用x射线衍射和扫描电子显微镜(SEM)对NCB粉末进行了表征。记录了复合材料在8.2 ~ 12.4 GHz频率范围内的复介电常数谱。结果表明,颗粒尺寸对电磁性能有较大影响。随着粒径的减小,复合介电常数先增大到一定程度后减小。有趣的是,NCB/环氧复合材料的切线损失与粒径的关系表明,25 nm尺寸最适合高损耗特性,而粒径< 25 nm时,损耗减小,这归因于颗粒的高表面积。此外,粒径为25 nm的NCB/环氧树脂复合材料在9.5 GHz频率下具有良好的电磁吸收效率,在2.5 GHz厚度为2.0 mm时,RL达到- 13.2 dB,反射损耗低于- 10 dB。讨论了颗粒尺寸对电磁性能的影响。版权所有©2018 VBRI出版社。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of particle sizes on the microwave absorption properties of nano-sized Carbon black/epoxy composites
The nano-sized carbon black (NCB) with particle sizes of 15, 25, 55 and 65 nm are added in epoxy matrix in order to investigate the impact of particle sizes on the microwave absorption properties of the nano composites. The NCB powders were characterized by X-ray diffraction and Scanning electron microscopy (SEM) for identification of impurity phases. The complex permittivity spectra were recorded for the composites in the frequency range of 8.2-12.4 GHz. The results revealed that the particle sizes had substantial impact on the electromagnetic properties. On decreasing the particle size, the complex permittivity increases first up to certain extent then decreases. Interestingly, the particle size dependent tangent loss of NCB/epoxy composites shows that 25 nm size is most suited for high loss characteristics, whereas, losses decreases with size < 25 nm, which is attributed to high surface area of the particles. In addition, NCB/epoxy composite with 25 nm particle size illustrated substantial EM absorption efficiency at a frequency of 9.5 GHz, with RL reaching −13.2 dB and reflection loss below −10 dB up to 2.5 GHz with thickness of 2.0 mm. The effect of particle sizes on the electromagnetic properties was also discussed. Copyright © 2018 VBRI Press.
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