摘要:随着现代信息技术的高速发展，电磁波污染变得越来越严重，同时为了适应信息化战争的出现，研究和开发高性能吸波材料已经引起了各国材料学者的关注。

本文采用有机凝胶先驱体转化法及水热法制备出Co2Y/ZnO复合纤维。采用了扫描电镜(SEM)、X射线衍射谱(XRD)对Co2Y/ZnO复合纤维的形貌、物相组成进行了表征，同时采用矢量网络分析仪(VNA)表征了其微波电磁参数及损耗特性，计算以硅胶为基质的吸波涂层在2~18GHz频率范围内的理论反射损耗值，分析不同涂层厚度时的吸波效果，研究了氧化锌含量对其吸波性能的影响。结果表明：Co2Y/ZnO复合纤维中ZnO

含量随着浸泡过程中硝酸锌溶液的浓度增大而增加，Co2Y/ZnO复合纤维吸波性能随着ZnO含量的增加呈现先变强后变弱的趋势。其中浸泡至浓度为10%的硝酸锌溶液所制得的Co2Y/ZnO复合纤维吸波性能最佳，其最小反射损耗为-56.8dB，反射损耗小于-10dB的带宽为11.89GHz(6.11

~18.0GHz)。

关键词：有机凝胶先驱体转化法；水热法；Y型铁氧体；复合纤维；微波吸收性能

Abstract:With the rapid development of modern information technology, electromagnetic wave pollution is becoming more and more serious, at the same time in order to adapt to the information war, the research and development of high performance absorbing materials have attracted the attention of scholars all over the material.

In this paper, Co2Y/ZnO composite fibers were prepared by organic gel precursor transformation and hydrothermal method. The morphology and phase composition of Co2Y/ZnO composite fibers were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). At the same time, the microwave electromagnetic parameters and loss characteristics were characterized by vector network analyzer (VNA) The influence of the content of zinc oxide on the microwave absorbing properties was studied by calculating the theoretical reflection loss of the absorbing coating with silica gel as the matrix in the frequency range of 2 ~ 18 GHz. The results show that the content of ZnO in Co2Y/ZnO composite fiber increases with the increase of the concentration of zinc nitrate solution during the soaking process, and the absorbing property of Co2Y/ZnO composite fiber tends to weaken  after the increase of ZnO content. The Co2Y/ZnO composite fiber prepared by soaking into the concentration of 10% zinc nitrate solution has the best microwave absorption performance, the minimum reflection loss is -56.8  dB, the reflection loss is less than -10 dB and the bandwidth is 11.89 GHz (6.11  ~18.0 GHz).

Keywords: organic  gel precursor   transformation method;hydrothermal method; Y-type ferrite; composite fiber; microwave absorption

目录

第一章 绪论 1

1.1微波吸收材料简介 1

1.1.1前言 1

1.1.2电磁屏蔽和吸波材料 1

1.1.3铁氧体微波吸收材料 3

1.1.4纤维吸波材料 4

1.1.5氧化锌吸波材料 5

1.2铁氧体复合材料研究现状 6

1.3微波吸收机理及测试机理 6

1.4本课题研究的目的和内容 8

第二章Co2Y及Co2Y/ZnO复合纤维的制备 10

2.1引言 10