NiO-CoO 复合掺杂对高 Bs 低损耗 MnZn 铁氧体性能影响∗

摘要

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 ℃).%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 B s 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 ＝2198,P cv ＝319 kW/m3,B s ＝540 mT (T ＝25℃),B s ＝451 mT (T ＝100℃).