Magnetic Properties of Sr-La M-Type Sintered Magnets Used Ferrite Fine Particles Prepared by Mechanical Compounding Method

Abstract

Sr-La M-Type ferrite fine particles were prepared by mechanical compounding using the planetary ball-mill and subsequent heat treatment. This experiment was carried out to investigate the magnetic properties of anisotropic and isotropic sintered magnets used Sr-La M-Type ferrite fine particles prepared by mechanical compounding. The optimum condition of making Sr-La M-Type sintered magnet and some properties of typical specimens are as follows; chemical composition:SrO•5.75Fe₂O₃; additive: 1.0wt%La₂O₃; planetary ball-mill condition:300rpm×1h; heat treatment condition: 1100°C×2h; sintering condition: 1225°C×2h. The value of (BH)_max for an anisotropic sintered magnet used these powders is obtained 34.5kJ/m³.