Nd‐Fe‐B系焼結磁石の熱処理と保磁力

  • 秋屋 貴博
    東北大学未来科学技術共同研究センター
  • 加藤 宏朗
    東北大学未来科学技術共同研究センター 山形大学大学院理工学研究科数物学分野
  • 宇根 康裕
    インターメタリックス株式会社
  • 佐川 眞人
    インターメタリックス株式会社

書誌事項

タイトル別名
  • Effects of Annealing on the Coercivity in Sintered Nd-Fe-B Magnets

抄録

  In order to understand the coercivity enhancement mechanism by annealing in sintered Nd-Fe-B magnets, we performed systematic annealing experiments. It was found that an addition of 0.13% of Cu not only enhance the coercivity but also ease the required cooling condition after annealing to obtain high coercivity. Using single successive annealing technique, we observed a 0.3 MA/m jump in coercivity at annealing temperature Ta=640℃ for Cu-free Nd-Fe-B magnets and at Ta=440-460℃ for Cu containing ones. We also observed sharp reduction of 0.15 MA/m in coercivity for Cu doped sintered Nd-Fe-B magnets at Ta=600℃. Furthermore, we confirmed a reversible behavior of coercivity at the annealing temperature range which is lower than the optimal annealing temperature. This implies that some kinds of reversible structural natures depending on the temperature are closely related to the coercivity of sintered Nd-Fe-B magnets.<br>

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