TiC/Fe@氮掺杂碳纳米角复合材料的电磁吸波性能  

Electromagnetic absorption properties of TiC/Fe@nitrogen-doped carbon nanohorn composites

作　　者：许莉 朱启程 张育斌 南艳丽 乔明涛 XU Li;ZHU Qicheng;ZHANG Yubin;NAN Yanli;QIAO Mingtao(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710072,China;Ningbo University of Finance and Economics,Ningbo 315175,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710072 [2]宁波财经学院,宁波315175

出　　处：《复合材料学报》2025年第1期336-348,共13页Acta Materiae Compositae Sinica

基　　金：陕西省自然科学基金(2024JC-YBQN-0526);浙江省自然科学基金(LQ21E010004);宁波市科技计划项目(2021S022)。

摘　　要：Fe/C复合材料因其优异的微波吸收性能而备受关注,但其阻抗匹配和匹配厚度有待进一步优化。本文通过高温等离子放电法在制备包覆Fe纳米颗粒的氮掺杂碳纳米角(Fe@NCNHs)的基础上引入了TiC,成功合成包覆TiC和Fe纳米颗粒的氮掺杂碳纳米角(TiC/Fe@NCNHs)复合材料。这种复合材料具有良好的阻抗匹配,同时具备介电损耗、磁损耗、反射损耗等多种损耗机制,展现出良好的电磁波衰减性能。实验结果表明:当Fe和Ti C纳米颗粒的负载量分别为9wt%和7wt%时,吸波性能最优。在频率为17.66 GHz处,其匹配厚度为1.4 mm,最小反射损耗达到-41.62 dB,有效吸收带宽为4.85 GHz(13.15~18 GHz)。本文解决了Fe/C复合材料阻抗匹配差的问题,并且进一步优化了其电磁波衰减性能,获得了“薄、轻、宽、强”的TiC/Fe@NCNHs吸波材料。Fe/C composites have attracted much attention due to their excellent microwave absorption properties,but their impedance matching and matched thickness need to be further optimised.In this paper,TiC was introduced on the basis of the preparation of nitrogen-doped carbon nanohorns(Fe@NCNHs)encapsulating Fe nanoparticles by high-temperature plasma discharge method,and N-doped carbon nanohorns(TiC/Fe@NCNHs)composites encapsulating TiC and Fe nanoparticles were successfully synthesised.This composite material has good impedance matching and various loss mechanisms such as dielectric loss,magnetic loss,reflection loss,etc.,and exhibits good electromagnetic wave attenuation performance.The experimental results show that the optimum wave-absorbing performance is achieved when the loadings of Fe and TiC nanoparticles are 9wt%and 7wt%,respectively.At a frequency of 17.66 GHz with a matched thickness of 1.4 mm,the minimum reflection loss reaches-41.62 dB and the effective absorption bandwidth is 4.85 GHz(13.15-18 GHz).In this study,the problem of poor impedance matching of Fe/C composites is solved,and the electromagnetic wave attenuation performance is further optimised,and the TiC/Fe@NCNHs wave-absorbing materials are obtained as"thin,light,wide and strong".

关 键 词：微波吸收 碳纳米角 TiC 阻抗匹配 反射损耗 介电损耗 

分 类 号：TB333[一般工业技术—材料科学与工程]