Abstract

The present work emphasizes the microwave absorption performance of single-walled carbon nanotube (SWCNT)/SiC composites prepared by mechanically mixing the components, i.e., SWCNT and SiC in desired weight fractions using a cost-effective and simple ball-milling route. The microwave absorption results reveal that the integration of SiC with a small weight fraction of SWCNT exhibited an improved absorption performance in the K_u band compared to pristine SiC. The SWCNT/SiC composite with 2.5 wt.% SWCNT exhibited a superior microwave absorption behavior with a minimum reflection loss of − 37.11 dB and < − 10 dB absorption bandwidth of 4.38 GHz for the absorber thickness of 2 mm. The microwave absorption efficiency of SWCNT/SiC composites was also measured corresponding to − 10 dB, which is equivalent to 90% microwave absorption when evaluating the absorption performance. A maximum microwave absorption efficiency of 18.95 dB GHz/mm was observed for the composite with 2.5 wt.% SWCNT dispersion compared to 3.4 dB GHz/mm for pristine SiC. Enhanced microwave absorption characteristics for SWCNT/SiC composites may be attributed to various absorption mechanisms, such as dipole polarization, multiple scatterings, multiple reflections, conductive loss, interfacial polarization, and defect-induced dipole polarization. The microwave absorption results of SWCNT/SiC composites indicate that they may serve as encouraging thin thickness candidates with superior microwave absorption for application in the K_u band.

Graphic Abstract

中文翻译：

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SWCNT / SiC复合材料的增强的微波吸收性能

摘要

本工作着重介绍了通过使用经济有效且简单的球磨工艺将组分（即SWCNT和SiC）以所需的重量分数机械混合而制备的单壁碳纳米管（SWCNT）/ SiC复合材料的微波吸收性能。微波吸收结果表明，SiC与SWCNT重量分数较小的集成表现出对K _u的改善的吸收性能。与原始SiC相比。含有2.5 wt。％SWCNT的SWCNT / SiC复合材料表现出优异的微波吸收性能，对于2 mm的吸收体厚度，最小反射损耗为− 37.11 dB，吸收带宽<− 10 dB为4.38 GHz。还测量了SWCNT / SiC复合材料的微波吸收效率，对应于− 10 dB，相当于评估吸收性能时的90％微波吸收。对于SWCNT分散度为2.5 wt％的复合材料，观察到最大微波吸收效率为18.95 dB GHz / mm，相比之下，原始SiC的复合材料的最大微波吸收效率为3.4 dB GHz / mm。SWCNT / SiC复合材料增强的微波吸收特性可能归因于各种吸收机制，例如偶极极化，多次散射，多次反射，导电损耗，界面极化，和缺陷引起的偶极极化。SWCNT / SiC复合材料的微波吸收结果表明，它们可作为令人鼓舞的薄厚度候选材料，具有优异的微波吸收性能，可用于K_你的乐队。

图形摘要