MN-ZN FERRITE TEMPORARY BAKED POWDER FOR OBTAINING CORE WITH HIGH SATURATION MAGNETIC FLUX DENSITY AND LOW LOSS

摘要

PURPOSE: To obtain a core having high density and excellent electromagnetic characteristics by limiting a mean primary particle size and mean secondary particle size of temporary baked powder to specific ranges. ;CONSTITUTION: Fe₂O₃, MnO and ZnO are so weighed as to become 71, 22 and 7wt.%, 150, 500ppm of SiO₂ and CaO are added thereto, and mixed by a ball mill. The mixture is temporarily baked at 950-1000°C for 1 hour to manufacture ferrite powder having a mean primary particle size of 0.13-1.0μm. Then, it is pulverized by a wet ball mill using pure water as solvent, and Mn-Zn ferrite having a mean secondary particle size (50% particle size) of a range of 1.0-1.4μ is manufactured. When the powder obtained in this manner is used, a sintered material having high sintering density, and fine and uniform crystalline grain composition is obtained, and hence a soft ferrite core having high saturation magnetic flux density and low core loss can be stably manufactured.;COPYRIGHT: (C)1994,JPO&Japio