本文關(guān)鍵詞： 錳鋅鐵氧體 初始磁導(dǎo)率 摻雜 化學(xué)共沉淀　出處：《昆明理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文研究了化學(xué)共沉淀法制備錳鋅鐵氧體的基本工藝,并對高磁導(dǎo)率錳鋅鐵氧體進(jìn)行了化學(xué)摻雜,研究了摻雜元素(Ca. Bi和Ti)對高磁導(dǎo)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(jìn)行Ca元素?fù)诫s,并制備了環(huán)狀樣品,測量環(huán)狀樣品的初始磁導(dǎo)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(nèi),初始磁導(dǎo)率仍然可以保持在10000左右。在Ca含量為0.02mol時(shí)各項(xiàng)性能最優(yōu),材料具有較好的磁性能及微觀結(jié)構(gòu)。另一方面,隨著Ca摻雜量的增加,初始磁導(dǎo)率減小速度增大,這與Ca2+的摻雜位置有關(guān)。 本實(shí)驗(yàn)還研究了Bi203摻雜對Mno.4Zn0.6Fe2O4鐵氧體材料的結(jié)構(gòu)與磁性能(包括磁化強(qiáng)度、初始磁導(dǎo)率以及晶粒尺寸)的影響。結(jié)果顯示,當(dāng)Bi203摻雜后,在700℃開始,形成液相燒結(jié),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(shí),初始磁導(dǎo)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(jié)構(gòu)。實(shí)驗(yàn)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(jìn)晶粒生長的作用。 此外,還對Ti02進(jìn)行了摻雜,進(jìn)行了Bi2O3-CaO-SiO2的復(fù)合摻雜實(shí)驗(yàn)研究,通過反復(fù)試驗(yàn),初步確定了其摻雜對高磁導(dǎo)率錳鋅鐵氧體的性能的影響,并且,進(jìn)行了SEM、平均粒度、初始磁導(dǎo)率、XRD及XPS分析,XRD及XPS證實(shí)為錳鋅鐵氧體結(jié)構(gòu),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(shí)驗(yàn)結(jié)果,并為工業(yè)應(yīng)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