【摘要】：錳鋅鐵氧體作為一種磁性能極佳的軟磁材料,已經(jīng)廣泛應用于現(xiàn)代高新技術(shù)產(chǎn)業(yè)各個領(lǐng)域,本文以ZnSO4·7H2O、FeSO4·7H2O、MnSO4·H2O作為原料,草酸銨(NH4)2C2O4·H2O作為沉淀劑,采用化學共沉淀法制備Mn-Zn鐵氧體前驅(qū)體粉末,最后通過成型、燒結(jié)得到錳鋅鐵氧體樣品；具體研究內(nèi)容有：一、具有尖晶石結(jié)構(gòu)的錳鋅鐵氧體形成過程；二、PH值、預燒溫度、燒結(jié)溫度對Mn-Zn鐵氧體微觀結(jié)構(gòu)的影響,從而進一步研究對其磁性能的影響；三、摻雜質(zhì)量分數(shù)為0.25%的Ti02對錳鋅鐵氧體磁導率的影響研究。 文章通過SEM、XRD等測試分析手段,研究了在不同工藝條件下制備的錳鋅鐵氧體晶粒大小、晶界等微觀結(jié)構(gòu),并進一步深入研究了對其磁性能的影響。研究表明：一、具有尖晶石結(jié)構(gòu)的錳鋅鐵氧體在預燒過程中初步形成,在燒結(jié)過程中完全形成；二、對比各PH值下制備的錳鋅鐵氧體SEM圖片,發(fā)現(xiàn)當混合液中PH值為7時,錳鋅鐵氧體微觀形貌比其他條件下的較好一些,制備出的錳鋅鐵氧體密度大約為5.17g/cm3,其磁導率、電阻率也相對較高,PH值為7時,是選擇制備高磁導率錳鋅鐵氧體較理想的PH值；三、通過對比在不同預燒溫度下制備的錳鋅鐵氧體SEM圖片,發(fā)現(xiàn)預燒溫度對錳鋅鐵氧體晶粒大小影響不大,對晶界的清晰度及氣孔有一定的影響,當預燒溫度為800℃時,錳鋅鐵氧體的密度大約為5.17g/cm3,制備出的錳鋅鐵氧體磁導率及電阻率都比其他溫度下的高,因此,對于制備高磁導率錳鋅鐵氧體較為理想的預燒溫度應該為800℃；四、對比在不同燒結(jié)溫度下制備的錳鋅鐵氧體微觀形貌,發(fā)現(xiàn)燒結(jié)溫度對錳鋅鐵氧體的晶粒大小、晶界清晰度及氣孔都有一定的影響,當燒結(jié)溫度達到1250℃時,通過SEM觀察發(fā)現(xiàn),樣品的晶粒大小、晶界整齊度等微觀結(jié)構(gòu)都比較理想,磁導率、電阻率也達到了最大值,如果制備高磁導率錳鋅鐵氧體,應選擇燒結(jié)溫度為1250℃；五、檢測制備的樣品磁導率發(fā)現(xiàn),磁導率隨頻率的變化下降較快,為了提高磁導率隨頻率變化的穩(wěn)定性,在補充實驗過程中,摻雜了質(zhì)量分數(shù)為0.25%的Ti02,通過對比發(fā)現(xiàn),摻雜一定量的Ti02有助于提高磁導率隨頻率變化的穩(wěn)定性。
[Abstract]:Mn-Zn ferrite, as a kind of soft magnetic material with excellent magnetic properties, has been widely used in various fields of modern high-tech industry. In this paper, ZnSO4 7H _ 2O, FeSO _ 4, H _ 2O, mn, so _ 4H _ 2O are used as raw materials and ammonium oxalate (NH4) 2C2O4 H _ 2O as precipitant. The Mn-Zn ferrite precursor powder was prepared by chemical coprecipitation method. Finally, the samples of MnZn ferrite were obtained by molding and sintering. The specific research contents are as follows: first, the formation process of Mn-Zn ferrite with spinel structure; The effect of sintering temperature on the microstructure of Mn-Zn ferrite and further study on its magnetic properties. Third, the effect of doped 0.25% Ti02 on the permeability of Mn-Zn ferrite. In this paper, the grain size and grain boundary of MnZn ferrite prepared under different technological conditions were studied by means of SEM,XRD, and the effect on its magnetic properties was further studied. The results show that: firstly, the MnZn ferrite with spinel structure is formed in the pre-sintering process, and then it is formed completely in the sintering process. Secondly, compared with the SEM images of the Mn-Zn ferrite prepared at various PH values, it is found that when the PH value in the mixed solution is 7, The microcosmic morphology of Mn-Zn ferrite is better than that under other conditions. The density of Mn-Zn ferrite is about 5.17g / cm ~ 3, and its permeability and resistivity are relatively high, and its PH value is 7, which is the ideal PH value for the preparation of Mn-Zn ferrite with high permeability. Thirdly, by comparing the SEM images of Mn-Zn ferrite prepared at different precalcination temperatures, it is found that the pre-sintering temperature has little effect on the grain size of Mn-Zn ferrite, but has a certain effect on the clarity of grain boundary and porosity, when the pre-sintering temperature is 800 鈩，

本文編號：2238113