Optimization of the post-sintering annealing condition for the high Cu content Nd-Fe-B sintered magnet
- Authors
- Kim, Tae-Hoon; Lee, Seong-Rae; Kim, Jin Woo; Do Kim, Young; Kim, Hyo-Jun; Lee, Min-Woo; Jang, Tae-Suk
- Issue Date
- 7-5월-2014
- Publisher
- AMER INST PHYSICS
- Citation
- JOURNAL OF APPLIED PHYSICS, v.115, no.17
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED PHYSICS
- Volume
- 115
- Number
- 17
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98536
- DOI
- 10.1063/1.4869157
- ISSN
- 0021-8979
- 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-Nd2O3 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). (C) 2014 AIP Publishing LLC.
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