Coercivity enhancement of HDDR-processed NdFeB permanent magnet with the rapid hot-press consolidation process

N. Nozawa, H. Sepehri-Amin, T. Ohkubo, K. Hono, T. Nishiuchi, S. Hirosawa

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

High coercivity, fully dense anisotropic permanent magnets of submicron grain sizes were produced by rapid hot-press consolidation of hydrogenationdisproportionationdesorptionrecombination (HDDR) processed NdFeCoB powders. In the hot-press process, the coercivity of the consolidated material showed a sharp minimum prior to full densification. Thereafter, it reached a value 25% higher than that of the initial powder. Scanning electron microscopy and transmission electron microscopy observations revealed that the variation in HcJ was caused by a redistribution of Nd along the grain boundaries during hot pressing and that the high coercivity was attributable to the formation of thin, continuous Nd-rich phase along the grain boundaries.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number1
DOIs
Publication statusPublished - 2011 Jan
Externally publishedYes

Keywords

  • Coercivity
  • Densification
  • Grain boundary
  • Hydrogenationdisproportionationdesorptionrecombination
  • Nd-rich phase
  • NdFeB
  • Permanent magnet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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