添加CaO和MoO3对MnZn铁氧体磁导率及阻抗频率特性的影响

摘要

采用氧化物陶瓷工艺制备高磁导率MnZn铁氧体材料，研究了CaO和MoO3添加对材料磁性能的影响。添加CaO可以形成高阻晶界层，增大材料电阻率，明显增大材料的中频阻抗。添加MoO3能促进晶粒长大，提高起始磁导率，但磁导率频率特性变差。当复合添加0.04wt% CaO和0.07wt% MoO3时，材料具有较好的综合性能：μi=11495，μ200kHz/μ10kHz=98%，T25×15×8的环状磁心在50mV、500kHz测试条件下，阻抗Z=2255Ω。%High permeability MnZn ferrite materials were prepared using oxide ceramic technology. The effect of CaO and MoO3 additives on the magnetic properties of MnZn ferrites was investigated. The addition of CaO can facilitate to form high resistance grain boundary layers, increasing the resistivity of the ferrite and significantly increasing the middle frequency impedance. MoO3 additive can promote grain growth, increasing the permeability of MnZn ferrite, but deteriorating the frequency dependence of permeability. When adding 0.04wt% CaO and 0.07wt%MoO3, better general properties were obtained withμi=11495,μ200kHz/μ10kHz=98%, core impedance of 2255Ωat 50mV and 500kHz.