Abstract
Experiments were carried out to investigate the effect of Na2O addition after semisintering treatment on magnetic properties of anisotropic BaO2ZnO8Fe2O3 magnets. It was found that the magnetic properties of Ba-Zn system W-type ferrite were improved by the addition of Na2O after semesintering treatment. The optimum condition of making magnets and some properties of typical specimens are as follows : composition BaO⋅2ZnO⋅8Fc2O3 in addition with 1.5wt% Na2O ; semisintering condition 1275°C for 1.Oh in air ; sintering condition 1250°C for 0.5h in air ; magnetic and physical properties are Jm=0.398 T, Jr=0.360 T, HcJ=103.6 kA/m, HcB=101.8 kA/m, (BH)max=19.9 kJ/m3, Tc=357°C, HA=1012 kA/m, KA=2.01x105J/m3
