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In situ construction of CNWs/SiC-NWs hybrid network reinforced SiCN with excellent electromagnetic wave absorption properties in X band
Carbon ( IF 10.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.carbon.2020.06.081
Fangyuan Ren , Jimei Xue , Xiaoling Liu , Laifei Cheng

Abstract Here we report a study regarding the microstructure and dielectric property of carbon nanowires (CNWs)/SiC nanowires (SiC-NWs) network reinforced SiCN ceramics. The combination of hybrid networks with hierarchical porous structure and dual-phase electromagnetic wave (EMW) absorbing materials could provide a very favorable condition for both impedance match and EMW attenuation which are two crucial elements for the achievement of excellent EMW absorption properties. In-situ synthesis was adopted to avoid the aggregation of nanowires thereby enhancing its dispersibility in the matrix. The high specific area and unique microstructure of CNWs and SiC-NWs hybrid network extend the propagation distance of EMW and facilitate the improvement of EMW attenuation in the process of multiple reflections, conductivity loss and polarization loss, thereby optimizing the absorption performance of the composites. CNWs/SiC-NWs/SiCN containing 5.75 wt% CNWs demonstrates excellent EMW absorption performance, achieving an effective absorption bandwidth of 4.2 GHz which covers the whole X band and the minimum reflection coefficient reaches −21.6 dB at a thickness of 2.35 mm. CNWs/SiC-NWs/SiCN composites demonstrate efficient EMW absorbing ability, providing novel ways of designing and reference for the development of EMW absorbing materials.

中文翻译:

CNWs/SiC-NWs混合网络的原位构建增强SiCN在X波段具有优异的电磁波吸收性能

摘要 在这里,我们报告了关于碳纳米线(CNWs)/SiC 纳米线(SiC-NWs)网络增强SiCN 陶瓷的微观结构和介电性能的研究。具有分层多孔结构的混合网络和双相电磁波 (EMW) 吸收材料的组合可以为阻抗匹配和 EMW 衰减提供非常有利的条件,这是实现优异 EMW 吸收性能的两个关键因素。采用原位合成来避免纳米线的聚集,从而提高其在基质中的分散性。CNWs和SiC-NWs混合网络的高比面积和独特的微观结构延长了EMW的传播距离,有利于改善EMW在多次反射、电导损失和极化损失过程中的衰减,从而优化复合材料的吸收性能。含有 5.75 wt% CNWs 的 CNWs/SiC-NWs/SiCN 表现出优异的 EMW 吸收性能,实现了 4.2 GHz 的有效吸收带宽,覆盖了整个 X 波段,并且在 2.35 mm 的厚度下最小反射系数达到 -21.6 dB。CNWs/SiC-NWs/SiCN复合材料表现出高效的电磁波吸收能力,为电磁波吸收材料的开发提供了新的设计思路和参考。
更新日期:2020-10-01
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