大気中反応焼成によるSr-Zn-W型フェライト粉末の磁気特性ならびにボンド磁石の作製(ハード磁性材料)

概要

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An experiment was carried out to improve the magnetic properties of Sr-Zn-W-type hexagonal ferrite powders, and bonded magnets were prepared from these powders. It was found that W-type hexagonal ferrite is easily producible in the air by replacing the Fe^<2+> part with Zn^<2+>. The preparation conditions for a typical sample were as follows ; chemical composition : SrO・1.5ZnO・0.5FeO・8Fe_2O_3 with added 0.3 wt% SiO_2, 0.7 wt% CaO, 1.0 wt% SrCO_3 ; reaction sintering condition : 1300℃×4.0 h in air ; annealing condition : 1050℃×5 min in air. The magnetic properties of Sr-Zn-W-type hexagonal ferrite powder are σ_s=92.9×10^<-6> Wb・m/kg, H_<oJ>=187.8 kA/m. The magnetic properties of hybrid (mixed 80% M-type ferrite powder and 20% W-type ferrite powder) bonded magnets are B_r=295 mT, (BH)_<max>=16.6kJ/m^3, H_<oJ>=177kA/m.
社団法人日本磁気学会の論文
2005-04-01