Development of Dy-Free Nd-Fe-B anisotropic bonded magnet and application to the small motors

Chisato Mishima, Kenji Noguchi, Masao Yamazaki, Hiroshi Matsuoka, Hironari Mitarai, Yoshinobu Honkura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The authors have successfully developed a low-cost anisotropic Nd-Fe-B magnet powder with a high coercivity value of 1591 kAm -1 without any dysprosium additives by diffusion processing of Nd-Cu-Al element into anisotropic magnet powder produced by the d-HDDR (dynamic-hydrogenation, disproportionation, desorption and recombination) method. This enhancement mechanism is to isolate the magnetic coupling between the grains of Nd 2Fe 14B phase by a Nd rich grain boundary phase with Cu. By surface coating this anisotropic magnet powder, the long-term aging loss behavior under air at 150°C is less than 5% after 1000 h. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number1
Publication statusPublished - 2012 Jan
Externally publishedYes


  • Anisotropic bonded magnet
  • D-HDDR(dynamic-hydrogenation
  • Desorption and recombination)
  • Diffusion process
  • Disproportionation
  • Dysprosium-free
  • Neodymium-iron-boron
  • Small motor

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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