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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 F110004917
整理番号 RX03P33WO
掲載日 2011年7月25日
出願国 大韓民国
出願番号 20077009967
公報番号 20070074593
公報番号 100863809
出願日 平成19年5月1日(2007.5.1)
公報発行日 平成19年7月12日(2007.7.12)
公報発行日 平成20年10月16日(2008.10.16)
国際出願番号 JP2005022963
国際公開番号 WO2006064848
国際出願日 平成19年5月1日(2007.5.1)
国際公開日 平成18年6月22日(2006.6.22)
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 Nd2 Fe14B main crystal into the grain boundary phase.
特許請求の範囲(英語) [claim1]

[I] M Nd Nd 2 Fe 14 B primary Crystal surrounded by metallic elements (However, the M's Pr, Dy, Tb, or Ho) fluoride, oxide, or chloride reduction process rich Nd with Crystal grain boundary phase ― Fe ― B system sintered magnet body surface forces the grain boundary phase wherein M metals diffusion osmosis is to Nd to feature ― Fe ― grain reforming how to B-magnet.

Nd of claim 1 to feature reduction process using a chemical reducing agent [2]-Fe-B magnet grain boundary modification method.

[3] wherein 2 way contact, a Nd Ca metal Mg metal, or hydride of them in a chemical reducing agent is to feature ― Fe ― magnets B boundary modification method.

[4] wherein 3 methods, used as a chemical reducing agent metal Ca or Mg metal, melting point depressant M metal fluoride, oxide, or salt IG k 卩 Nd characteristics to the reduction process in liquid phase ― Fe ― magnets B boundary modification method.

Nd of claim 1 to feature magnetic and cathode, metal or alloy or graphite by insoluble anode and then have molten salt electrolysis reduction processing, [5] M metal fluorides or oxides, or chloride, Li metal or Ba metal, salts and heating to melt-Fe-B magnets grain reforming how.

[6] wherein 5 for contact, the Nd instead of insoluble anode, soluble anode and Z M metal alloys used to feature ― Fe ― magnets B boundary modification method.

[7] claim 1 wherein modification methods, reduced oxygen concentration low oxygen volume of 1% or less-features to Nd-Fe ― grain reforming how to B-magnet.

Methods [8] claim 1, after reduction continues aging process that characterized

ND-Fe-B magnet production methods.

To remove the surface layer obtained by [9] claim 1 wherein the magnet Nd-

Fe-B magnet production methods.

Features to cut more than one magnet magnet obtained by [10] claim 1

ND-Fe-B magnet production methods.

Grain boundary modified by modification of [II] claim 1 Nd-Fe-B magnets.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • OSAKA UNIVERSITY
  • 発明者(英語)
  • MACHIDA KENICHI
  • SUZUKI SHUNJI
国際特許分類(IPC)
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