本文關鍵詞： 錳鋅鐵氧體 初始磁導率 摻雜 化學共沉淀　出處：《昆明理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：本文研究了化學共沉淀法制備錳鋅鐵氧體的基本工藝,并對高磁導率錳鋅鐵氧體進行了化學摻雜,研究了摻雜元素(Ca. Bi和Ti)對高磁導率錳鋅鐵氧體性能的影響。 為了改善鐵氧體材料的頻率特性,對錳鋅鐵氧體MnxZn1-xFe2O4進行Ca元素摻雜,并制備了環(huán)狀樣品,測量環(huán)狀樣品的初始磁導率隨頻率的變化(即μi-f曲線)。研究發(fā)現(xiàn),隨著Ca含量的增多,頻率特性得到改善,在250Hz內,初始磁導率仍然可以保持在10000左右。在Ca含量為0.02mol時各項性能最優(yōu),材料具有較好的磁性能及微觀結構。另一方面,隨著Ca摻雜量的增加,初始磁導率減小速度增大,這與Ca2+的摻雜位置有關。 本實驗還研究了Bi203摻雜對Mno.4Zn0.6Fe2O4鐵氧體材料的結構與磁性能(包括磁化強度、初始磁導率以及晶粒尺寸)的影響。結果顯示,當Bi203摻雜后,在700℃開始,形成液相燒結,使材料的晶粒尺寸顯著增加,致密度增大；在摻雜量為0.005mol時,初始磁導率有最優(yōu)值,晶粒尺寸增大較明顯,較均勻。說明Bi203摻雜不但可以改善鐵氧體的磁性能也能優(yōu)化其微觀結構。實驗發(fā)現(xiàn),隨著Bi203元素的增加,材料的晶粒尺寸不斷變大,出現(xiàn)異常長大,及不均勻性,這表明,Bi203具有促進晶粒生長的作用。 此外,還對Ti02進行了摻雜,進行了Bi2O3-CaO-SiO2的復合摻雜實驗研究,通過反復試驗,初步確定了其摻雜對高磁導率錳鋅鐵氧體的性能的影響,并且,進行了SEM、平均粒度、初始磁導率、XRD及XPS分析,XRD及XPS證實為錳鋅鐵氧體結構,及摻雜的位置,其他測試則證明了其摻雜對性能的影響。取得良好的實驗結果,并為工業(yè)應用提供了依據(jù)。
[Abstract]:In this paper, the basic technology of preparing Mn-Zn ferrite by chemical coprecipitation was studied, and the high permeability Mn-Zn ferrite was chemically doped. The effect of doping elements such as Ca. Bi and Ti on the properties of manganese-zinc ferrite with high permeability was studied. In order to improve the frequency characteristics of ferrite materials, MnxZn1-xFe2O4 was doped with Ca and the annular samples were prepared. The change of initial permeability with frequency (渭 i-f curve) was measured. It was found that with the increase of Ca content, the frequency characteristics were improved within 250 Hz. The initial permeability can still be kept at about 10000. When Ca content is 0.02mol, the properties of the material are the best, and the material has better magnetic properties and microstructure, on the other hand. The decrease rate of initial permeability increases with the increase of Ca doping content, which is related to the doping position of Ca2. The structure and magnetic properties (including magnetization) of Bi203 doped Mno.4Zn0.6Fe2O4 ferrite materials were also investigated. The effect of initial permeability and grain size). The results show that when Bi203 is doped, liquid phase sintering is formed at 700 鈩，

本文編號：1484056