添加CaO对高磁导率Mn-Zn铁氧体磁性能的影响  

Effects of CaO Addition on Magnetic Properties of High Permeability Mn-Zn Ferrite

作　　者：莫才颂 马李 MO Caisong;MA Li(College of Mechanical and Electrical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]广东石油化工学院机电工程学院,茂名525000

出　　处：《机械工程材料》2020年第5期12-15,48,共5页Materials For Mechanical Engineering

基　　金：广东省自然科学基金资助项目(2017A030307018);广东省扬帆计划项目(201533018);广东省橡塑材料制备与加工工程技术研究中心开放基金资助项目(2017B090903083)。

摘　　要：以MnO、ZnO和Fe2O3为基础原料,固定其配比后,添加质量分数在01.0%的CaO,采用传统两步合成工艺制备Mn-Zn铁氧体,研究CaO对铁氧体微观结构和磁性能的影响。结果表明:随着CaO添加量的增加,Mn-Zn铁氧体的平均晶粒尺寸和烧结密度先增大后减小,2.2 MHz频率下的弹性磁导率先增大后急剧减小再略微增大,1T磁场强度下的饱和磁化强度先增大后减小,矫顽力先减小后增大;适量CaO可以改善Mn-Zn铁氧体的微观结构,降低铁心损耗;当CaO质量分数为0.4%时,Mn-Zn铁氧体在1T磁场强度下的饱和磁化强度最大,为46A·m^2·kg^-1,2.2MHz频率下的弹性磁导率较大,为86.7,损耗功率较低,约为20kW·m^-3,矫顽力较低,约为183.4kA·m^-1,Mn-Zn铁氧体的综合磁性能较好。After fixing the ratio of basic raw materials of MnO,ZnO and Fe2 O3,and then adding CaO with mass fractions of 0-1.0%,the Mn-Zn ferrite was prepared by traditional two-step synthesis process.The effect of CaO on microstructure and magnetic properties of Mn-Zn ferrite was studied.The results show that with increasing CaO addition content,the average grain size and sintering density of Mn-Zn ferrite increased first and then decreased;the elastic permeability at the frequency of 2.2 MHz increased first,then sharply decreased,and then slightly increased;the saturation magnetization at the magnetic field intensity of 1 Tincreased first and then decreased;the coercivity decreased first and then increased.Adding proper amount of CaO could improve microstructure of Mn-Zn ferrite and decrease core loss.When the content of CaO was 0.4 wt%,the Mn-Zn ferrite had the largest saturation magnetization at the magnetic field intensity of 1 Tof 46 A·m^2·kg^-1,the relatively large elastic permeability at the frequency of 2.2 MHz of 86.7,the relatively low loss power of about 20 kW·m^-3 and the relatively low coercivity of 183.4 kA·m^-1,and the Mn-Zn ferrite had the good comprehensive magnetic properties.

关 键 词：MN-ZN铁氧体 CAO 微观结构 磁性能 

分 类 号：TB31[一般工业技术—材料科学与工程]