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High frequency and high field magnetic resonance in panoscopic- assembled rare earth magnets

Research Project

Project/Area Number 20900111
Allocation TypeSingle-year Grants
Research InstitutionYamagata University

Principal Investigator

KATO Hiroaki  山形大学, 大学院理工学研究科, 教授 (40177465)

Co-Investigator(Renkei-kenkyūsha) KOIKE Kunihiro  山形大学, 大学院理工学研究科, 助教 (40241723)
Project Period (FY) 2008
Project Status Completed (Fiscal Year 2008)
Keywords希土類永久磁石 / ネオジム磁石 / 界面ナノ構造 / 保磁力 / 結晶場 / 強磁場 / Nd-Fe-B / DSC / 焼結磁石
Outline of Final Research Achievements

Nd-Fe-B系焼結磁石について, 最大140kOeの磁場を印加し, 種々の温度T_aで熱処理を行なった結果, 以下のことが明らかになった.
1. Dy無添加試料では, Cuを微量添加した場合にT_a=500℃付近で, CuとAlの両方を添加した試料ではT_a=550℃付近のとき, 磁場中熱処理による保磁力の顕著な上昇が見られた.
2. DSCの測定から, Cu添加の試料では500℃以上でNd-Cu液相が, CuおよびAlを添加した試料ではAl-Cu液相が粒界に存在することを示唆した.
3. Dy部分置換試料の実験から, 保磁力が熱処理時に加えた磁場の大きさに対して直線的に増加すること, およびその増加率が, Dy置換量とともに急激に増大することを見出した.

Report

(2 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (4 results)

All 2009 2008

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (1 results) Book (1 results)

  • [Journal Article] Enhancement of coercivity in Al and Cu added Nd-Fe-B sintered magnets by high field annealing2009

    • Author(s)
      Takahiro Akiya, Hiroaki Kato, Masato Sagawa and Keiichi Koyam
    • Journal Title

      IOP Conf. Series : Materials Science and Engineering 1

      Pages: 12034-12034

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coercivity enhancement induced by high-magnetic-field annealing in sintered Nd-Fe-B magnets2008

    • Author(s)
      H. Kato, T. Akiya, K. Koike, K. Koyama, and M. Sagawa
    • Journal Title

      Proceedings of 20th International Workshop on Rare Earth Permanent Magnet & Their Applications, Edited by D. Niarchos

      Pages: 111-113

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] Coercivity enhancement induced by high-magnetic-field annealing in sintered Nd-Fe-B magnets2008

    • Author(s)
      Hiroaki Kato
    • Organizer
      20th International Workshop on Rare Earth Permanent Magnet & Their Applications
    • Place of Presentation
      Crete, Greece
    • Year and Date
      2008-09-09
    • Related Report
      2008 Annual Research Report
  • [Book] 第3章第1節 : 「希土類磁石Sm-Co, Nd-Fe-B」2008

    • Author(s)
      加藤宏朗、杉本諭
    • Total Pages
      16
    • Publisher
      エヌ・ティー・エス、「希土類の材料技術ハンドブック」(足立吟也鑑修)
    • Related Report
      2008 Annual Research Report

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Published: 2010-06-11   Modified: 2016-11-18  

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