【摘要】：MnZn鐵氧體納米磁性材料作為一種多功能材料,廣泛應(yīng)用于遠(yuǎn)程通訊設(shè)備和各種開關(guān)電源轉(zhuǎn)換器設(shè)備中,在高頻弱電領(lǐng)域中,已經(jīng)成為很有發(fā)展前途的一種磁性材料。因其具有高的初始磁導(dǎo)率和較高的飽和磁感應(yīng)強(qiáng)度,較低的矯頑力等優(yōu)點(diǎn),它的制備技術(shù)受到科研人員的極大關(guān)注。現(xiàn)今,納米磁性材料的制備方法主要包括高能球磨法、化學(xué)沉淀法、熱分解法等。其中,高能球磨法具有配方準(zhǔn)確、工藝簡單以及易于大規(guī)模工藝生產(chǎn)的優(yōu)點(diǎn)。本文研究了機(jī)械法制備錳鋅鐵氧體的工藝過程對其磁性能的影響,實驗中主要運(yùn)用的是高能球磨法,高能球磨法的工作原理是通過研磨介質(zhì)與物料的剪切和碰撞,達(dá)到對物料磨碎、磨細(xì)的效果。物料的研磨效果與許多因素息息相關(guān),其中包括研磨速度、介質(zhì)配比、研磨時間等。本文利用控制變量法首先研究了在制備錳鋅鐵氧體原料的各個工藝過程的最佳參數(shù),選擇最佳參數(shù)下制備出的錳鋅鐵氧體,運(yùn)用高能球磨法,制備錳鋅鐵氧體磁流體,并確定最佳轉(zhuǎn)速、研磨時間以及最佳的研磨介質(zhì)配比。最終得到高能球磨法制備錳鋅鐵氧體磁流體的最佳工藝參數(shù)。本文通過實驗研究,得出了以下結(jié)論:(1)結(jié)合錳鋅鐵氧體原料組分與初始磁導(dǎo)率之間的關(guān)系圖,以及錳鋅鐵氧體的磁性理論,通過實驗研究得出,其他工藝過程相同的情況下,以制得的錳鋅鐵氧體初始磁導(dǎo)率為依據(jù),確定最佳原料主配方。(2)適量的摻雜能夠提高錳鋅鐵氧體的磁性能。本文研究了 SiO2、Bi2O3、Nb2O5單一摻雜與復(fù)雜摻雜對錳鋅鐵氧體磁性能的影響,得出的結(jié)論是,在工藝實驗范圍內(nèi),影響MnZn鐵氧體初始磁導(dǎo)率的最大因素,從大到小排序為SiO2、Bi2O3、Nb2O5,并確定其最佳摻雜配方。(3)二次球磨時間的延長,可有效減小粉料的粒徑。本文通過研究二次球磨時間對樣品密度、粉料粒徑以及樣品形貌特征等的影響,得出最佳二次球磨時間。(4)通過控制變量法,綜合對比不同工藝條件下樣品粒度、粘度、飽和磁化強(qiáng)度,最終確定分散劑種類、研磨介質(zhì)規(guī)格、轉(zhuǎn)速與球磨時間。用機(jī)械法制備出的錳鋅鐵氧體磁流體,樣品結(jié)構(gòu)均勻細(xì)致,穩(wěn)定性優(yōu)異,飽和磁化強(qiáng)度高,可驗證機(jī)械法制備錳鋅鐵氧體磁流體不僅可行,且行之有效。
[Abstract]:As a multifunctional material, MnZn ferrite nanomagnetic material has been widely used in remote communication equipment and various switching power converter devices. It has become a promising magnetic material in the field of high frequency and weak current. Because of its high initial permeability, high saturation magnetic induction intensity and low coercivity, its preparation technology has attracted great attention of researchers. Nowadays, the preparation methods of nanomagnetic materials include high energy ball milling, chemical precipitation, thermal decomposition and so on. Among them, high energy ball milling has the advantages of accurate formula, simple process and easy to be produced in large scale. In this paper, the effect of mechanical process on the magnetic properties of Mn-Zn ferrite is studied. The high energy ball milling method is mainly used in the experiment. The working principle of the high energy ball milling method is the shear and collision between the grinding medium and the material. To achieve the material grinding, grinding effect. The grinding effect of materials is closely related to many factors, including grinding speed, medium ratio, grinding time and so on. In this paper, the control variable method is used to study the optimum parameters of the process of preparing manganese zinc ferrite. The Mn-Zn ferrite magnetic fluid is prepared by high-energy ball milling method. And determine the best speed, grinding time and the best ratio of grinding media. Finally, the optimum process parameters for the preparation of Mn-Zn ferrite magnetofluids by high energy ball milling were obtained. In this paper, the following conclusions are obtained through experimental research: (1) combining with the relationship diagram between the raw material composition and initial permeability of MnZn ferrite and the magnetic theory of Mn-Zn ferrite, the experimental results are obtained. According to the initial permeability of the prepared MnZn ferrite, the optimum raw material main formula is determined under the same process. (2) the magnetic properties of MnZn ferrite can be improved by proper doping. In this paper, the influence of SiO2,Bi2O3,Nb2O5 single doping and complex doping on the magnetic properties of Mn-Zn ferrite is studied. It is concluded that, in the range of technological experiment, the biggest factor affecting the initial permeability of MnZn ferrite is SiO2,Bi2O3, from large to small. (3) prolonging the secondary milling time can effectively reduce the particle size of the powder. In this paper, the effects of secondary ball milling time on the density, particle size and morphology of the samples were studied, and the optimum secondary milling time was obtained. (4) the particle size and viscosity of the samples under different technological conditions were compared synthetically by controlling variable method. Saturation magnetization, final determination of dispersant type, grinding medium specifications, speed and ball milling time. The Mn-Zn ferrite magnetic fluid prepared by mechanical method has the advantages of uniform structure, excellent stability and high saturation magnetization. It can be verified that the preparation of Mn-Zn ferrite magnetic fluid by mechanical method is not only feasible, but also effective.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM277

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 智彥軍;余忠;姬海寧;李樂中;孫科;蘭中文;;ZrO_2添加劑對MnZn功率鐵氧體溫度特性的影響[J];壓電與聲光;2011年02期

2 ;Hydrothermal synthesis of Mn-Zn ferrites from spent alkaline Zn-Mn batteries[J];Particuology;2009年06期

3 吳斯捷;蘭中文;余忠;;MnZn鐵氧體添加劑的研究[J];實驗科學(xué)與技術(shù);2009年04期

4 梁麗萍;劉玉存;王建華;;軟磁鐵氧體的發(fā)展與應(yīng)用[J];山西化工;2007年02期

5 王麗;郭楚文;湯云峰;;錳鋅鐵氧體磁流體粘磁特性實驗研究[J];金屬功能材料;2006年01期

6 席國喜,路邁西;錳鋅鐵氧體材料的制備研究新進(jìn)展[J];人工晶體學(xué)報;2005年01期

7 張益棟,蘭中文,余忠;Nb_2O_5摻雜對高頻MnZn功率鐵氧體微結(jié)構(gòu)和性能的影響[J];磁性材料及器件;2003年05期

8 楊志伊,陳俊,劉書進(jìn);磁流體在鐵譜技術(shù)中的應(yīng)用研究[J];摩擦學(xué)學(xué)報;2002年02期

9 劉輝,鐘偉,都有為;新型磁性液體的制備及其旋轉(zhuǎn)軸動態(tài)封油技術(shù)研究[J];磁性材料及器件;2001年02期

10 郭廣生,王志華,余實,楊福明;氣-液化學(xué)反應(yīng)制備氮化鐵磁性液體[J];無機(jī)材料學(xué)報;2000年05期

，

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