金属蒸気を収着した希土類焼結磁石粉末の磁気特性

• 町田 憲一

  大阪大学先端科学技術共同研究センター

• 堀川 高志

  大阪大学先端科学技術共同研究センター

• 伊東 正浩

  大阪大学先端科学技術共同研究センター

書誌事項

タイトル別名

• Magnetic Properties of the Nd-Fe-B Sintered Magnet Powders Recovered by Metal Vapor Sorption
• キンゾク ジョウキ オ シュウチャク シタ キドルイ ショウケツ ジシャク フンマツ ノ ジキ トクセイ

抄録

Fine ground powders of Nd-Fe-B sintered magnets (particle size = 46-125 μm in diameter) were coated and alloyed with Zn, Mg or Yb metal by sorbing them. For the sorption of Zn or Mg metal vapor, any effective recovery of magnetic properties of the ground powders was not observed. On the contrary, a significant recovery of the decreased magnetic properties of the ground powders was observed when the Yb metal was used as a sorbing material. The sorbing temperature and time for Yb metal vapor were optimized and after heating at 800°C for 90 min and annealing subsequently at 610°C for 60 min, the remanence (B_r), coercivity (H_cJ) and maximum energy product ((BH)_max) values were increased to be 0.98T, 712kA/m and 173kJ/m³, respectively. From the microstructural characterizations of resulting samples, it was found that the sorbed Yb metal uniformly covered the surface and diffused to the grain boundary of fine powders forming a (Nd, Yb)Fe₂ Phase. The Yb metal repairs the surface defects produced by grinding and oxidation. In addition, the surface of ground powders becomes smooth through the Yb metal sorption, so that the H_k/H_c value was improved.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 51 (3), 149-156, 2004

  一般社団法人 粉体粉末冶金協会

キーワード

• rare earth magnets
• Nd<SUB>2</SUB>Fe<SUB>14</SUB>B sintered magnets
• metal vapor sorption
• magnetic properties
• recovery

詳細情報

• CRID: 1390001206307232768
• NII論文ID: 10012716130
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.51.149
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 6905823
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6905823
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可