纳米四氧化三铁复合吸波材料的制备与性能研究

发布时间：2018-04-14 21:32

  本文选题：Fe_3O_4 + FeCoNi　； 参考：《中北大学》2017年硕士论文

【摘要】：四氧化三铁(Fe_3O_4)是一种反尖晶石型的亚铁磁性材料,在微波入射波段,对电磁波既可以产生磁损耗,又可以产生电损耗,是一种双复介质材料。为满足现代军事武器对吸波材料“薄、轻、宽、强”的要求。本课题对四氧化三铁进行了复合、钴镍化学镀等一系列改性,以期改善四氧化三铁在低频区(0-6000MHz)的微波吸收性能,具体研究方法和内容如下:(1)采用低温水溶液法和共沉淀法两种方法制备四氧化三铁磁性微粉,分别测试两种方法制得的四氧化三铁的吸波性能,低温水溶液法制备得到的四氧化三铁吸波性能更优,故选取低温水溶液法作为下步制备四氧化三铁的方法。(2)采用水热法制备Fe_3O_4/Zn O复合物,X射线衍射(XRD)、能谱分析仪(EDS)及扫描电子显微镜(SEM)的表征结果表明成功制备出了Fe_3O_4/Zn O复合物。通过吸波性能测试得出摩尔比n(Fe_3O_4):n(ZnO)=2:1制备的Fe_3O_4/ZnO复合物吸波性能最佳。(3)采用原位聚合法制备Fe_3O_4/ZnO/PAn复合物,XRD、EDS、SEM、TEM及IR测试表征结果表明成功制备出了不同苯胺添加量的Fe_3O_4/ZnO/PAn复合物,并考察了不同添加量的苯胺对复合材料吸波性能的影响。(4)采用液相还原法制备不同元素摩尔比的FeCoNi铁系金属合金微粉,并对不同元素摩尔比的铁系合金微粉进行了XRD、SEM、EDS的表征,考察了柠檬酸浓度对铁系金属合金微粉的吸波性能,钴镍摩尔为1:2制备的样品的最大回损值达到-34.4dB。(5)采用银氨溶液作为敏化活化剂,对Fe_3O_4进行Fe、Co、Ni铁系金属合金的化学镀,考察了温度、pH值及反应时间对化学镀工艺及样品吸波性能的影响,最后分析了无钯化学镀的反应机理,在pH=9,反应温度为80℃,反应时间为6小时的相同反应条件下,钴镍对为1:1时吸波性能最佳。
[Abstract]:S _ 3O _ 4) is an antispinel type ferromagnetic material. In the microwave wave band, it can produce both magnetic loss and electric loss for electromagnetic wave, so it is a kind of double complex dielectric material.In order to meet the requirements of modern military weapons for absorbing materials "thin, light, wide, strong".In order to improve the microwave absorption properties of Fe _ 2O _ 3 in low frequency region, Fe _ 2O _ 3 was modified by composite and electroless plating of cobalt and nickel in order to improve the microwave absorption of Fe _ 2O _ 3 in the low frequency region.The specific research methods and contents are as follows: (1) Fe _ 2O _ 3 magnetic powder was prepared by low-temperature aqueous solution method and co-precipitation method, and the microwave absorption properties of the two methods were tested respectively.The microwave absorbing property of Fe _ 2O _ 3 prepared by low-temperature aqueous solution method is better.Therefore, the low temperature aqueous solution method was selected as the next step to prepare iron trioxide.) the Fe_3O_4/Zn O complex was prepared by hydrothermal method. The Fe_3O_4/Zn O complex was characterized by energy spectrum analyzer and scanning electron microscope (SEM). The results showed that the Fe_3O_4/Zn O complex was successfully prepared.The results of Tem and IR measurements showed that the best absorptivity of Fe_3O_4/ZnO composites prepared by molar ratio n(Fe_3O_4):n(ZnO)=2:1 was obtained by in situ polymerization. The results of Tem and IR measurements showed that Fe_3O_4/ZnO/PAn complexes with different aniline content were successfully prepared.The effects of different amounts of aniline on the absorbing properties of the composites were investigated. (4) the FeCoNi Fe alloy powders with different molar ratios of elements were prepared by liquid phase reduction method, and the Fe series alloy powders with different molar ratios of elements were characterized by XRDX SEMEDS, and the effects of different molar ratios of aniline on the absorbing properties of the composites were investigated.The effect of citric acid concentration on the microwave absorption of Fe based metal alloy powder was investigated. The maximum return loss value of the sample prepared at 1:2 was -34. 4 dB.t5) the silver ammonia solution was used as the sensitizing activator for electroless plating of Fe_3O_4 on Fe _ (Co) O _ (2) Fe _ (2) Fe _ (2) alloy.The effects of temperature and pH value and reaction time on the electroless plating process and the absorbing property of the sample were investigated. Finally, the reaction mechanism of palladium free electroless plating was analyzed. The reaction temperature was 80 鈩，

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