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Nd-fe-b magnet with modified grain boundary and process for producing the same

外国特許コード F110004643
整理番号 RX03P33WO
掲載日 2011年7月20日
出願国 中華人民共和国
出願番号 200580042529
公報番号 101076870
公報番号 101076870
出願日 平成17年12月14日(2005.12.14)
公報発行日 平成19年11月21日(2007.11.21)
公報発行日 平成23年3月30日(2011.3.30)
優先権データ
  • 特願2004-365088 (2004.12.16) JP
発明の名称 (英語) Nd-fe-b magnet with modified grain boundary and process for producing the same
発明の概要(英語)

In the conventional process, a coercitivity increase is realized by effecting selective presence of, for example, Dy metal in crystal grain boundary zones of sintered magnet. However, as this process employs a physical film forming technique using a vacuum vessel, such as sputtering, there has been a difficulty in mass productivity in the performing of vast quantities of magnet treatment. Further, from the viewpoint, for example, that an expensive high-purity Dy metal or the like must be employed as a film forming material, there has been a drawback in magnet cost.

There is provided a method of modifying the grain boundary of Nd-Fe-B magnet, characterized in that a fluoride, oxide or chloride of metal element M (M: Pr, DY, Tb or Ho) is subjected to reduction treatment so that there is effected diffusion infiltration of the metal element M from the surface of Nd-Fe-B sintered magnet having an Nd rich crystal grain boundary phase surrounding the circumferential part of Nd2Fe14B main crystal into the grain boundary phase.

  • 出願人(英語)
  • JAPAN SCIENCE & TECH AGENCY
  • 発明者(英語)
  • MACHIDA KENICHI,SUZUKI SHUNJI
国際特許分類(IPC)
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