二磨时间对MnZn铁氧体结构和磁性能的影响

采用氧化物陶瓷工艺制备MnZn功率铁氧体,研究二次球磨时间对MnZn功率铁氧体微观结构和磁性能的影响.通过对铁氧体断面微观形貌的表征及密度、电阻率和磁特性的测试,结果表明,随着二次球磨时间的延长,MnZn功率铁氧体的密度、起始磁导率、饱和磁感应强度及电阻率均先增大后减小,损耗则先减小后增大.当二次球磨时间为2 h时,密度、起始磁导率、饱和磁感应强度及电阻率均达到最大值,总损耗最小且在25～120 ℃宽温范围内均低于350 kW/m~3.

Influences of Second Milling time on Microstructure and Magnetic Properties of MnZn Ferrites

MnZn power ferrites were prepared by the conventional oxide ceramic process. The influences of second milling time on the microstructure and magnetic properties of MnZn power ferrites were investigated by means of characterizing the fracture surface micrograph,electrical resistivity,magnetic properties and density by scanning electron microscope (SEM),SZ-82 digital four-probe tester,B-H analyzer and Archimedes method,respectively.The results indicated that all the density, initial permeability, saturation magnetic induction and electrical resistivity of MnZn power ferrites were increased initially and then decreased with the prolong of second milling time,while the power loss was decreased first and increased subsequently.When the second milling time is 2 h,the density,initialpermeability,saturation magnetic induction and electrical resistivity reached their maximum,the total power loss achieveed its minimum and was lower than 350 kW/m~3 within the wide temperature ranging of 25～120 ℃.