掺杂对宽温高导MnZn铁氧体直流叠加特性的影响

Effect of additives on the DC superposition characteristic of MnZn ferrite materials with high permeability at wide temperature range

采用传统氧化物陶瓷工艺制备MnZn铁氧体材料。为获得高性能的MnZn软磁铁氧体材料,研究工艺条件及CaO、Nb2O5、Co2O3、TiO2等掺杂对MnZn软磁铁氧体材料增量磁导率的影响。结果表明,适量的CaO掺杂可使铁氧体晶粒尺寸细化,改善铁氧体晶粒的均匀性;适量的Co2O3添加可以改善材料增量磁导率的温度特性;添加适量Nb2O5与TiO2有利于提高起始磁导率、电阻率,降低磁损耗,从而改善材料的直流叠加特性。通过优化掺杂工艺,制备出了高磁导率、宽温、高直流叠加MnZn软磁铁氧体材料。

MnZn ferrite materials were prepared using common oxide ceramic technology. To get high performance MnZn soft magnetic ferrite material, effects of CaO,Nb2O5,Co2O3,TiO2 and other doping on the permeability and DC superposition characteristic of the MnZn ferrite materials were researched. The results show that doping a proper amount of CaO additive can facilitate reducing crystal grain size and improving uniformity of grain size. Proper addition of Co2O3 can improve the temperature dependance of permeability. Suitable amount of Nb2O5 and TiO2 dopants can increase the initial permeability and resistivity, and decrease the power losses, resultantly improving DC superposition characteristic. In the last, MnZn ferrite material with high permeability, wide temperature range, high DC superposition can be obtained by optimizing the doping.