ZnO对锰锌铁氧体磁性能温度特性的影响

Influence of ZnO Stoichiometry on Temperature Dependence of Magnetic Properties in MnZn Power Ferrites

采用氧化物陶瓷工艺制备MnZn功率铁氧体,通过在不同温度下对铁氧体磁性能的测试,研究了ZnO含量对MnZn功率铁氧体磁性能温度特性的影响。结果表明,MnZn功率铁氧体室温下的起始磁导率和饱和磁感应强度随ZnO含量的增加呈先升高后下降的趋势,当w(ZnO)=12%时,起始磁导率和饱和磁感应强度达到最大值。同时,ZnO含量增加,起始磁导率-温度(μi-T)曲线Ⅱ峰所对应的温度点向低温移动,居里温度则一直降低。在100kHz、200mT条件下,随着ZnO含量的增加,常温下铁氧体的损耗先减小后增大,且损耗最低点温度也逐渐降低,并对应着μi-T曲线的Ⅱ峰位置。

MnZn power ferrites were prepared by conventional oxide ceramic technique.Then the influence of ZnO stoichiometry on the temperature dependence of magnetic properties in MnZn power ferrites was investigated at different temperature.The results showed that the initial permeability and saturation magnetic flux density at room temperature initial increased and then decreased with the increase of ZnO content,which reach the maximum when the ZnO content is 12%.Meanwhile,the temperature of secondary maximum peak of μi-T curve and the Curie temperature decrease with the increase of ZnO content. At room temperature,the power loss initially increased and then decreased with the increase of ZnO content,and the temperature of lowest power loss decreased,corresponding with the temperature of secondary maximum peak of μi-T curve at 100 kHz,200 mT.