Optimization of the post-sintering annealing condition for the high Cu content Nd-Fe-B sintered magnet

Tae Hoon Kim, Seong Rae Lee, Jin Woo Kim, Young Do Kim, Hyo Jun Kim, Min Woo Lee, Tae Suk Jang

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We investigated the changes in microstructure and magnetic properties of Nd-Fe-B magnets as a function of Cu content (Cu addition in the range of 0.2-0.5 at.%). We have focused on the phase-transformation temperature of the Nd-rich phases in dependence of the Cu content. The coercivity of the magnets decreased (from 28.7 kOe to 27.1 kOe) on increasing Cu content under identical post-sintering annealing (PSA) conditions. The Cu-enriched C-Nd 2O3 triple junction phase (TJP) and grain boundary phase (GBP) were observed in the 0.2 at.% Cu-containing magnet. However, in the 0.5 at.% Cu-containing magnet, the Cu-enriched TJP and GBP appeared in the form of the h-Nd2O3 phase that could be transformed into the C-Nd2O3 phase by a modified 1st-PSA temperature. The coercivity of the 0.5 at.% Cu-containing magnet was noticeably enhanced (from 27.1 kOe to 29.4 kOe).

Original languageEnglish
Article number17A770
JournalJournal of Applied Physics
Volume115
Issue number17
DOIs
Publication statusPublished - 2014 May 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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