本文選題：Fe_3O_4 + FeCoNi��； 參考：《中北大學》2017年碩士論文

【摘要】：四氧化三鐵(Fe_3O_4)是一種反尖晶石型的亞鐵磁性材料,在微波入射波段,對電磁波既可以產(chǎn)生磁損耗,又可以產(chǎn)生電損耗,是一種雙復介質(zhì)材料。為滿足現(xiàn)代軍事武器對吸波材料“薄、輕、寬、強”的要求。本課題對四氧化三鐵進行了復合、鈷鎳化學鍍等一系列改性,以期改善四氧化三鐵在低頻區(qū)(0-6000MHz)的微波吸收性能,具體研究方法和內(nèi)容如下:(1)采用低溫水溶液法和共沉淀法兩種方法制備四氧化三鐵磁性微粉,分別測試兩種方法制得的四氧化三鐵的吸波性能,低溫水溶液法制備得到的四氧化三鐵吸波性能更優(yōu),故選取低溫水溶液法作為下步制備四氧化三鐵的方法。(2)采用水熱法制備Fe_3O_4/Zn O復合物,X射線衍射(XRD)、能譜分析儀(EDS)及掃描電子顯微鏡(SEM)的表征結(jié)果表明成功制備出了Fe_3O_4/Zn O復合物。通過吸波性能測試得出摩爾比n(Fe_3O_4):n(ZnO)=2:1制備的Fe_3O_4/ZnO復合物吸波性能最佳。(3)采用原位聚合法制備Fe_3O_4/ZnO/PAn復合物,XRD、EDS、SEM、TEM及IR測試表征結(jié)果表明成功制備出了不同苯胺添加量的Fe_3O_4/ZnO/PAn復合物,并考察了不同添加量的苯胺對復合材料吸波性能的影響。(4)采用液相還原法制備不同元素摩爾比的FeCoNi鐵系金屬合金微粉,并對不同元素摩爾比的鐵系合金微粉進行了XRD、SEM、EDS的表征,考察了檸檬酸濃度對鐵系金屬合金微粉的吸波性能,鈷鎳摩爾為1:2制備的樣品的最大回損值達到-34.4dB。(5)采用銀氨溶液作為敏化活化劑,對Fe_3O_4進行Fe、Co、Ni鐵系金屬合金的化學鍍,考察了溫度、pH值及反應時間對化學鍍工藝及樣品吸波性能的影響,最后分析了無鈀化學鍍的反應機理,在pH=9,反應溫度為80℃,反應時間為6小時的相同反應條件下,鈷鎳對為1:1時吸波性能最佳。
[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，

本文編號：1751093