Magnetic Properties of Sr-Zn-W-Type Ferrite Powders Prepared by Reaction Sintering in Air and Production of Bonded Magnets

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  • 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
  • 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
  • タイキ チュウ ハンノウ ショウセイ ニ ヨル Sr Zn Wガタ フェライト フンマツ ノ ジキ トクセイ ナラビニ ボンド ジシャク ノ サクセイ

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Abstract

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 Fe2+ part with Zn2+. The preparation conditions for a typical sample were as follows; chemical composition: SrO·1.5ZnO·0.5FeO·8Fe2O3 with added 0.3 wt% SiO2, 0.7 wt% CaO, 1.0 wt% SrCO3; reaction sintering condition: 1300°C × 4.0 h in air; annealing condition: 1050°C × 5 min in air. The magnetic properties of Sr-Zn-W-type hexagonal ferrite powder are σs=92.9 × 10-6Wb·m/kg, HcJ=187.8 kA/m. The magnetic properties of hybrid (mixed 80% M-type ferrite powder and 20% W-type ferrite powder) bonded magnets are Br=295 mT, (BH)max=16.6 kJ/m3, HcJ=177 kA/m.

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