铁氧体复合吸波材料的制备研究
毕业论文关键词：铁氧体，毫米波衰减，碳纤文，复合，尖晶石。
Abstract
Title： Preparation of ferrite composite absorbing materials
In this paper, nickel ferrite was prepared by the sol-gel method, and syntheses of polyaniline-nickel ferrite and polypyrrole-nickel ferrite composite absorbing material were using in situ redox Preparation. Moreover, carbon fiber-nickel ferrite was prepared using a co-precipitation method. Scanning electron microscopy (SEM), X- ray diffraction (XRD), differential thermal analysis (DTA) and microwave attenuation device were used to characterize microtopography, crystallographic form, heat behavior and microwave attenuation performance.
Based on the discussion of calcination temperature, nickel ferrite precursor calcined at 800 ℃ could get complete spinel nickel ferrite. Microstructure and millimeter-wave attenuation performance of prepared NiFe2O4/PPY were better than those of NiFe2O4/PANI. 8mm and 3mm wave maximum attenuation values reach 16dB and 11dB respectively, which was superior to NiFe2O4/PANI of 9dB and 7dB at 8mm and 3mm waveband. And attenuation performances of samples at 8mm wave were stronger than those at 3mm waveband.
The resulting carbon fiber/nickel ferrite microstructure is not very good, but maximum values of samples at 8mm and 3mm waveband were up to 36dB and 29dB, respectively.
Key words: ferrite, millimeter wave attenuation, carbon fiber, composite, spinel.
目 录
摘要 I
Abstract II
1.绪论 1
1.1 引言 1
1.2 吸波材料简介 1
1.2.1 纳米吸波材料 2
1.2.2铁氧体吸波材料简介 2
1.3 铁氧体制备工艺的研究进展 2
1.3.1 沉淀法 2
1.3.2溶胶-凝胶法 3
1.3.3 溶剂热法 4
1.4 铁氧体复合吸波材料制备的研究进展 4
1.5 本课题研究内容 5
2. 溶胶—凝胶法制备铁酸镍及表征 6
2.1 引言 6
2.2 实验 6
2.2.1 实验试剂与仪器 6
2.2.2 实验步骤 7
2.2.3 测试表征 7
2.3 实验结果与讨论 7
2.3.1 NiFe2O4的微观结构分析 7
2.3.2 NiFe2O4前驱体TG-DTA表征 8
2.3.3 NiFe2O4在不同温度下的XRD表征 8
2.4 本章小结 9
3. 聚苯胺/铁酸镍、聚吡咯/铁酸镍的复合材料制备及表征 11
3.1 前言 11
3.2实验 11
3.2.1 实验试剂与仪器 11
3.2.2 实验步骤 12
3.2.3测试表征 13
3.3.实验结果与讨论 13
3.3.1 NiFe2O4/PANI复合物的微观结构分析 13