Effective recycling for Nd-Fe-B sintered magnet scraps

Takashi Horikawa, Kouji Miura, Masahiro Itoh, Ken Ichi Machida

研究成果: Conference article査読

13 被引用数 (Scopus)


Rare earth sintered magnet scrap powders (Nd2Fe14B sludge) were melted and solidified with Si or Ti to produce Fe-based intermetallic compounds and coproducts of rare-earth-oxide slugs. After separating them, oxygen content measurements and energy dispersive X-ray analysis (EDX) observations demonstrated that about 60% of the rare earth components in the raw scrap powders were efficiently collected as rare-earth-oxide slugs during the melting process. The former compounds were ground into fine powders and some of them were heated at 100-250 °C for 1-12 h in air. The epoxy resin composites with 80-83 wt% of these powders showed good microwave absorption properties at GHz range. For Fe-Si (18.5 at% Si) and heat-treated (250 °C, 3 h) Laves phase Fe2Ti intermetallic compound, the minimum reflection loss (RL) values of -38.8 and -39.4 dB were observed at 3.3 and 12.3 GHz, respectively.

ジャーナルJournal of Alloys and Compounds
出版ステータスPublished - 2006 2月 9
イベントProceedings of the Rare Earths'04 in Nara, Japan -
継続期間: 2004 11月 72004 11月 12

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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