羰基铁粉形貌对吸波性能的影响

发布时间：2018-01-19 21:14

本文关键词： 羰基铁粉电磁吸波颗粒形貌　出处：《重庆大学学报》2017年10期 　论文类型：期刊论文

【摘要】：由于羰基铁粉具有温度稳定性好、吸收频带宽、可设计性强等优点,从而得到了广泛的研究与应用。对两种参数基本一致,但形貌各异的羰基铁粉(球状和树枝状)进行了电磁吸波性能测试,用以研究形貌对羰基铁粉电磁吸波性能的影响。实验结果表明,形貌对羰基铁粉的电磁吸波性能有非常大的影响。相比于球状羰基铁粉,树枝状羰基铁粉的最大反射损耗增加了94%,达到-47.14dB。同时,对应于最大反射损耗的频率从球状羰基铁粉的11.88GHz移动到树枝状羰基铁粉的6.44GHz。这是因为树枝状形貌有利于形成不连续网络、增加对入射微波的漫反射、还可以带来更多的界面电荷极化,从而增强对电磁波的吸收强度。此外,本研究表明各向异性结构是提高介电常数和介电损耗获得轻质宽带吸波剂的有效途径。
[Abstract]:The carbonyl iron powder has been widely studied and applied because of its advantages of good temperature stability, wide absorption bandwidth and good designability. However, the electromagnetic absorbing properties of carbonyl iron powder (spherical and dendritic) were tested to study the influence of morphology on the electromagnetic absorbing property of carbonyl iron powder. The experimental results show that the effect of morphology on the electromagnetic wave absorption property of carbonyl iron powder is studied. The morphology of carbonyl iron powder has a great influence on the electromagnetic wave absorption performance. Compared with the spherical carbonyl iron powder, the maximum reflection loss of the dendritic carbonyl iron powder increases by 94 parts, reaching -47.14 dB. At the same time. The frequency corresponding to the maximum reflection loss shifts from 11.88 GHz of spherical carbonyl iron powder to 6.44 GHz of dendritic carbonyl iron powder, which is due to the fact that the dendritic morphology is conducive to the formation of discontinuous networks. Increasing diffuse reflection of incident microwave can also bring more interfacial charge polarization, thus increasing the absorption intensity of electromagnetic wave. This study shows that anisotropic structure is an effective way to increase dielectric constant and dielectric loss to obtain light broadband absorbent.
【作者单位】：国网重庆市电力公司电力科学研究院;重庆大学光电工程学院;
【基金】：国家自然科学资助项目基金(No.61203098) 国网重庆市电力公司电力科学研究院资助项目(SGCQDK-00JS1500117)~~
【分类号】：TB34
【正文快照】： Supported by the National Natural Science Fund(61203098),the State Grid Electric Power Research Instituteof Chongqing Electric Power Company(SGCQDK00JS1500117).随着通信技术的发展,避免电磁干扰和反电子侦查变得越来越重要,并且吸引了大量学者对电磁(EM)波吸收材

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