化学共沉淀法制备Mn-Zn铁氧体及其磁性能研究
发布时间：2018-09-12 05:58
【摘要】：锰锌铁氧体作为一种磁性能极佳的软磁材料,已经广泛应用于现代高新技术产业各个领域,本文以ZnSO4·7H2O、FeSO4·7H2O、MnSO4·H2O作为原料,草酸铵(NH4)2C2O4·H2O作为沉淀剂,采用化学共沉淀法制备Mn-Zn铁氧体前驱体粉末,最后通过成型、烧结得到锰锌铁氧体样品；具体研究内容有：一、具有尖晶石结构的锰锌铁氧体形成过程；二、PH值、预烧温度、烧结温度对Mn-Zn铁氧体微观结构的影响,从而进一步研究对其磁性能的影响；三、掺杂质量分数为0.25%的Ti02对锰锌铁氧体磁导率的影响研究。 文章通过SEM、XRD等测试分析手段,研究了在不同工艺条件下制备的锰锌铁氧体晶粒大小、晶界等微观结构,并进一步深入研究了对其磁性能的影响。研究表明：一、具有尖晶石结构的锰锌铁氧体在预烧过程中初步形成,在烧结过程中完全形成；二、对比各PH值下制备的锰锌铁氧体SEM图片,发现当混合液中PH值为7时,锰锌铁氧体微观形貌比其他条件下的较好一些,制备出的锰锌铁氧体密度大约为5.17g/cm3,其磁导率、电阻率也相对较高,PH值为7时,是选择制备高磁导率锰锌铁氧体较理想的PH值；三、通过对比在不同预烧温度下制备的锰锌铁氧体SEM图片,发现预烧温度对锰锌铁氧体晶粒大小影响不大,对晶界的清晰度及气孔有一定的影响,当预烧温度为800℃时,锰锌铁氧体的密度大约为5.17g/cm3,制备出的锰锌铁氧体磁导率及电阻率都比其他温度下的高,因此,对于制备高磁导率锰锌铁氧体较为理想的预烧温度应该为800℃；四、对比在不同烧结温度下制备的锰锌铁氧体微观形貌,发现烧结温度对锰锌铁氧体的晶粒大小、晶界清晰度及气孔都有一定的影响,当烧结温度达到1250℃时,通过SEM观察发现,样品的晶粒大小、晶界整齐度等微观结构都比较理想,磁导率、电阻率也达到了最大值,如果制备高磁导率锰锌铁氧体,应选择烧结温度为1250℃；五、检测制备的样品磁导率发现,磁导率随频率的变化下降较快,为了提高磁导率随频率变化的稳定性,在补充实验过程中,掺杂了质量分数为0.25%的Ti02,通过对比发现,掺杂一定量的Ti02有助于提高磁导率随频率变化的稳定性。
[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，
本文编号：2238113
[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，
本文编号：2238113
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