Development of High Fe Concentration Sm<sub>2</sub>Co<sub>17</sub> Magnets with (<i>BH</i>)<sub>max</sub> of 280 kJ/m<sup>3</sup>

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  • 280 kJ/m<sup>3</sup>高鉄濃度サマリウムコバルト磁石の開発・実用化
  • 受賞記念講演 平成27年度技術進歩賞 280kJ/m³高鉄濃度サマリウムコバルト磁石の開発・実用化
  • ジュショウ キネン コウエン ヘイセイ 27ネンド ギジュツ シンポショウ 280kJ/m ³ コウテツ ノウド サマリウムコバルト ジシャク ノ カイハツ ・ ジツヨウカ

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<p>We have developed Sm2Co17 sintered magnets whose Fe concentration is much higher than conventional Sm2Co17 sintered magnets. The pre-aging treatment leads to fine cell structure and improvement in squareness of demagnetization curves. As a result the (BH)max of pre-aged magnets shows higher than that of no-pre-aged magnet. The inter-mediate heat treatment (IHT) induces the grain growth. We found that squareness of demagnetization curve has clearly improved by the IHT at adequate temperature. These results indicate that reducing the fraction of grain boundaries by increasing the grain size affects the behavior of domain-wall motion. Sm2Co17 sintered magnets fabricated adopting pre-aging treatment and IHT show (BH)max of 282 kJ/m3.</p>

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