Effect of Milling on the Properties of High Permeability Mn-Zn Ferrite Powders

AbstractHigh permeability Mn-Zn ferrites with broad frequency characteristic were prepared by the traditional ceramic method using the pre-sintering powders of Mn-Zn ferrite wastes. ICP Atomic Emission Spectrophotometer, scanning electron microscopy (SEM), Particle Sizer and LCR broadband digital bridge were used to investigate the influence of milling on the microstructure and properties of sintered Mn-Zn ferrite. During the milling, the impurities such as silicon and chromium were introduced into the powders as using steel balls. The particle size of powders decreased to a †minimum size with the increasing of milling time. As the particle size after milling was about 1 um, the initial permeability of Mn-Zn ferrites with small internal porosity, high density and uniform structure could reach 10000. Furthermore, the value were unaffected by the change in frequency 0 to 150 kHz