预烧温度对MnZn功率铁氧体微观组织以及性能的影响  

Effects of pre-sintering temperature on the microstructure and properties of MnZn power ferrites

作　　者：杨文达[1] 王寅岗[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《磁性材料及器件》2014年第5期49-52,57,共5页Journal of Magnetic Materials and Devices

摘　　要：利用氧化物陶瓷工艺制备MnZn功率铁氧体。研究了不同预烧温度下铁氧体粉料的相变及其对铁氧体结构和性能的影响。结果表明,当预烧温度升高至880℃时,粉料中生成了明显的尖晶石相Zn1-xMnxFe2O4。随着预烧温度的升高,烧结试样的密度(d)、起始磁导率(μi)、饱和磁感应强度(Bs)和电阻率(ρ)均先升高后降低,功率损耗(Pcv)先降低后升高,均在880℃预烧时达到最优点:密度、起始磁导率、饱和磁感应强度和电阻率分别达到最高值4.86g/cm3、2570、528mT和6.6?·m,功率损耗降至最低值369kW/m3。因此,在880℃下预烧的粉料活性适中,烧结后能获得均匀致密的微观组织和优良的电磁性能。MnZn power ferrites were prepared by oxide ceramic process. Ferrite powder phase transition at different pre-sintering temperature and its influence on the microstructure and properties of the ferrite were investigated. The results indicate that obvious spinel phase appears in the pre-sintered powders when the pre-sintering temperature rise to 880℃. The density（d）, initial permeability（μi）, saturation magnetic induction（Bs） and electrical resistivity（ρ） of the sintered samples all increase initially and then decrease with increasing pre-sintering temperature, while contrary is the case for the power loss（Pcv）. For optimal pre-sintering temperature 880℃, ferrite is obtained with d=4.86 g.cm3, μi=2570, Bs =528mT, ρ=6.6Ω.m, and Pcv =369kW/m3. Therefore the pre-sintering powder pre-sintered at 880℃ has moderate activity, leading to uniform and dense microstructure and excellent performance of sintered ferrite material.

关 键 词：MNZN功率铁氧体 预烧 微观组织 性能 

分 类 号：TM277[一般工业技术—材料科学与工程]