NiO-CoO复合掺杂对高B_s低损耗MnZn铁氧体性能影响

Influence of combined NiO and CoO dopants on the properties of low-loss and high B_s MnZn ferrites

采用传统氧化物工艺制备了NiO-CoO掺杂的MnZn软磁铁氧体材料。研究了NiO、CoO复合掺杂对高Bs低损耗的MnZn铁氧体微结构及电磁性能的影响。结果表明,掺杂0.1%(质量分数)CoO和1.28%(质量分数)NiO的MnZn铁氧体晶粒生长均匀,具有较高的饱和磁感应强度,最低损耗点位于100℃。随着NiO掺杂量的增加,最低功耗点向高温方向移动。CoO掺杂导致材料密度增大,功耗降低。在钟罩炉中按特定烧结曲线烧结MnZn铁氧体具有较好的综合性能:μi=2 198,Pcv=319kW/m3,Bs=540mT(T=25℃),Bs=451mT(T=100℃)。

MnZn soft ferrite materials with NiO-CoO dopant were prepared by conventional oxide technique.The influences of CoO and NiO addition on the microstructure and magnetic properties of low-loss and high B s MnZn ferrites were investigated.It was confirmed that the sample with CoO addition of 0.1wt% and NiO addi-tion of 1.28wt%,homogeneous grains are formed and has high saturation magnetic flux density.The low loss point was located at 100 ℃.Valley point of power loss shifts to higher temperature with increasing of NiO dop-ant.With increase of CoO addition,the power losses decrease and sintering density increases.The MnZn ferrite in a specific sintering curve has excellent comprehensive properties:μi =2 1 98,P cv =31 9 kW/m3 ,B s =45 1 mT (T =100 ℃).