Magnetic Properties of Hot Press Magnets Prepared from Mechanically Compounded M-Type Ferrite Fine Particles

Abstract

Sr-La-Co M-type ferrite fine particles with high coercivities can be prepared by mechanical compounding (M.C.) method using the planetary ball-mill and subsequent heat treatment. This experiment was carried out to investigate the magnetic properties of ferrite sintered magnets prepared by the hot-pressing process using M.C. powders. The anisotropic sintered magnets were obtained from the hot-pressing process without magnetic field pressing. Typical magnetic and physical properties of the sample obtained by this process are as follows; (BH)_max=19.9 kJ/m³, J_r =0.330 T, H_cJ=308kA/m, H_cB=224kA/m, and density = 5.05 Mg/m³.