预烧对锰锌铁氧体预烧相及烧结显微结构的影响  

Influence of Pre-sintering on the Pre-sintered Phase and Microstructure of Sintered Phase of Mn-Zn Ferrite

作　　者：华程[1] 毛健[1] 莫红军[1] 罗强华[1] 刘颖[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064

出　　处：《磁性材料及器件》2007年第1期34-36,共3页Journal of Magnetic Materials and Devices

基　　金：四川大学材料科学与工程博士后流动站及四川宜宾五粮液集团公司博士后工作站资助项目(04H045)

摘　　要：采用传统的陶瓷工艺制备了Mn-Zn铁氧体。用X射线衍射(XRD)仪和扫描电子显微镜(SEM)研究了预烧温度对铁氧体预烧相及烧结显微结构的影响。结果表明,在840～1000℃预烧相以α-Fe2O3为主。随着预烧温度的升高,α-Fe2O3的含量逐渐增加,而ZnFe2O4和Mn2O3的含量逐渐减少,Mn3O4固溶于ZnFe2O4形成铁锰锌固溶体,且其含量随着预烧温度的升高呈增大趋势。预烧温度对Mn-Zn铁氧体烧结显微结构和功率损耗有较大的影响。适宜的预烧温度可以获得分布均匀、细小的晶粒及低的功耗,低于或高于此预烧温度,都将造成烧结Mn-Zn铁氧体显微结构的恶化和功率损耗的升高。实验结果表明,对于1340℃的烧结温度,最佳预烧温度为960℃。Mn-Zn ferrites were prepared by oxide ceramic technology. X-ray diffraction （XRD） and scanning electron microscopy （SEM） were used to investigate the influence of pre-sintering temperature on the pre-sintered phases ＇and microstructure of sintered Mn-Zn ferfite. The main phase is α-Fe2O3 in Mn-Zn ferrite at pre-sintering temperatures of 840℃ to 1000℃. With the increase of pre-sintering temperature, the proportion of α-Fe2O3 increases and those of ZnFe2O4 and Mn2O3 decrease gradually. Mn3O4 dissoloves in ZnFe2O4 to form Mn-Fe-Zn solid solution. The higher pre-sintering temperature is in favor of forming more Mn-Fe-Zn solid solution. At the same time, the microstructure and power loss of Mn-Zn ferrites are affected observably by the pre-sintering temperature. Good microstructure and low power loss can be obtained at the suitable pre-sintering temperature of 960℃, and bellow or exceeding this temperature, the microstructure becomes worse and the power loss increases.

关 键 词：MN-ZN铁氧体 预烧温度 预烧相 显微结构 

分 类 号：TM277.1[一般工业技术—材料科学与工程]