本文關(guān)鍵詞： 溶膠-凝膠法 離子取代 鋇鐵氧體 磁性能 微波吸收性能　出處：《中北大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著現(xiàn)代雷達(dá)、微波通信和電子技術(shù)的飛速發(fā)展，以及在武器隱形技術(shù)上，，微波暗室上與抗電磁干擾的技術(shù)方面上的應(yīng)用，微波吸收材料目前已經(jīng)受到越來越多的人的關(guān)注。鐵氧體吸收材料既有介電損耗又有磁性損耗的一種微波吸收材料。本文主要介紹鋇鐵氧體吸波材料及鋇鐵氧體/空心微珠復(fù)合吸波材料的最新研究進(jìn)展及制備方法。由于鋇鐵氧體具有良好的粒度、較強的各向異性和適中的飽和磁化強度使其成為重要的磁性材料和吸波材料，廣泛應(yīng)用于高密度磁記錄、高性能永磁體、微波器件以及在民用和軍事技術(shù)中應(yīng)用，因而備受人民關(guān)注。 本研究是采用溶膠-凝膠法，制備出具有磁鉛石型結(jié)構(gòu)的鋇鐵氧體。檸檬酸絡(luò)合分解法由于基本反應(yīng)在溶液中進(jìn)行，達(dá)到分子水平上的混合，因而顆粒細(xì)小且均勻，在制備超微鐵氧體的方面優(yōu)于其它方法。 （1）為了優(yōu)化工藝條件，采用檸檬酸法制備Ni-Mg-Co替代其中Fe元素的Ba(Ni0.5Mg0.45Co0.05)xFe12-xO19（x=0，1，2，3）納米粉體，設(shè)計正交實驗，重點考察了檸檬酸用量、替代量X、pH值、煅燒溫度及保溫時間對制備納米鋇鐵氧體的影響，同時在正交實驗的基礎(chǔ)上考慮兩個單因素變量替代量X和檸檬酸用量對其電磁性能的影響，最終得出檸檬酸法制備純的粒徑較小且分散均勻的納米的最佳實驗條件。 （2）研究離子取代對BaM型鐵氧體結(jié)構(gòu)和電磁性能的影響。為了滿足不同領(lǐng)域的各類需求通過Ni2+、Mg2+、Co2+取代M型鋇鐵氧體中Fe3+研究發(fā)現(xiàn)，離子取代鋇鐵氧體隨著取代量的不同，磁性能和吸波性能有不同的變化趨勢。結(jié)果表明：在最佳實驗條件下可以制備單一相的鋇鐵氧體Ba(NiMg0.9Co0.1)Fe10O19納米粉體；有其最大的飽和磁化強度以及在最佳匹配厚度2.0mm，同時在12GHz位置上的吸收峰最佳反射率為-16.2dB，吸收大于-10dB的峰寬達(dá)到了4.1GHz。 （3）為了Ba(NiMg0.9Co0.1)Fe10O19鋇鐵氧體獲得更好的吸波性能，因此選擇合適兩種粒徑的空心微珠，空心微珠表面包覆單相的磁鉛石型結(jié)構(gòu)型的Ba(NiMg0.9Co0.1)Fe10O19復(fù)合粉體是采用溶膠-凝膠法制備的，Ba(NiMg0.9Co0.1)Fe10O19與空心微珠表面包覆的磁損耗與介電損耗在不同頻段有不同的表現(xiàn)形式。由于Ba(NiMg0.9Co0.1)Fe10O19中加入空心微珠復(fù)合后其吸波性能變差，綜合考慮其實驗關(guān)鍵因素。我們需要知道如何控制好選擇合適粒徑的空心微珠和涂層的匹配厚度，從而獲得更好的吸波性能。
[Abstract]:With the rapid development of modern radar, microwave communication and electronic technology, as well as the application in weapon stealth technology, microwave darkroom and anti-electromagnetic interference technology, Microwave absorbing materials have attracted more and more attention. Ferrite absorbing materials have both dielectric loss and magnetic loss. This paper mainly introduces barium ferrite absorbing materials and barium ferrite. The latest research progress and preparation methods of composite microwave absorbing materials with hollow microspheres are presented. Because barium ferrite has good particle size, Strong anisotropy and moderate saturation magnetization make it an important magnetic and absorbing material, widely used in high density magnetic recording, high performance permanent magnets, microwave devices, as well as in civilian and military technologies, As a result, people are concerned about it. In this study, barium ferrite with magnetic lead structure was prepared by sol-gel method. Due to the basic reaction in solution, citric acid complex decomposition method achieved molecular level mixing, so the particles were fine and uniform. It is superior to other methods in preparing ultrafine ferrite. In order to optimize the technological conditions, Ni-Mg-Co powder was prepared by citric acid method to replace Fe element Bani _ (0.5) mg _ (0.45) Co _ (0.05) X Fe _ (12-x) O _ (19) O _ (19) O _ (10) O _ (1) O _ (2) O _ (2) O _ (2) O _ (3) nanometer powder. The orthogonal experiment was designed. The effects of calcination temperature and holding time on the preparation of nanocrystalline barium ferrite were studied. On the basis of orthogonal experiment, the effects of the substitution amount X and the amount of citric acid on the electromagnetic properties of nanocrystalline barium ferrite were considered. Finally, the optimum experimental conditions for the preparation of nanometer nanoparticles with small particle size and uniform dispersion by citric acid method were obtained. The influence of ion substitution on the structure and electromagnetic properties of BaM type ferrite was studied. In order to meet the various demands in different fields, the study of Fe3 in Ni2 Mg2 / Co 2 substituted M type barium ferrite found that the substitution barium ferrite with different substitution amount. The results show that the barium ferrite Ba(NiMg0.9Co0.1)Fe10O19 nanocrystalline powders with single phase can be prepared under the optimum experimental conditions. With the maximum saturation magnetization and the optimum matching thickness of 2.0 mm, the optimum reflectivity of the absorption peak at 12GHz is -16.2 dB, and the peak width greater than -10 dB reaches 4.1 GHz. (3) in order to obtain better absorbing property of Ba(NiMg0.9Co0.1)Fe10O19 barium ferrite, two kinds of hollow microspheres were chosen. The magnetic loss and dielectric loss of hollow microspheres coated with single-phase magneto-lead type Ba(NiMg0.9Co0.1)Fe10O19 composite powders prepared by sol-gel method are different in different frequency range from that prepared by sol-gel method. When the hollow microspheres are added into the Ba(NiMg0.9Co0.1)Fe10O19, the absorbing property of the composite becomes worse. Considering the key factors of the experiment, we need to know how to control the matching thickness of the appropriate diameter hollow beads and the coating, so as to obtain better wave absorption performance.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM277

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