Magnetic and microstructural characteristics of DyF3/DyHx dip-coated Nd-Fe-B sintered magnets
- Authors
- Bae, Kyoung-Hoon; Kim, Tae-Hoon; Lee, Seong-Rae; Kim, Hyo-Jun; Lee, Min-Woo; Jang, Tae-Suk
- Issue Date
- 5-11월-2014
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Rare-earth alloys and compounds; Powder metallurgy; Magnetization; Microstructure
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.612, pp.183 - 188
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 612
- Start Page
- 183
- End Page
- 188
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/96794
- DOI
- 10.1016/j.jallcom.2014.05.166
- ISSN
- 0925-8388
- Abstract
- We investigated the microstructural and magnetic property changes of DyF3/DyHx dip-coated Nd-Fe-B sintered magnets, as a function of the DyF3/DyHx mixing ratio. As the fraction of DyHx in a DyF3/DyHx mixed solution was increased (0 -> 50 -> 100%), there was a coincident gradual increase in coercivity (14.9 -> 15.4 -> 16.5 kOe). Similarly, the diffusion depth of Dy from the magnet surface also increased with an increasing fraction of DyHx. In the diffused region, we observed well-developed core-shell microstructures in the DyHx dip-coated magnet, but this was not seen in the case of the DyF3 dip-coated magnet. Diffusion of Dy to the main phase was via lattice diffusion predominantly, rather than through grain boundary diffusion in the DyF3 dip-coated magnet, but the opposite was observed in the DyHx dip-coated magnet, which is believed to be due to the different influences of F- and H+ ions. Therefore, the use of DyHx solution is considered more suitable for developing a core-shell microstructure by encouraging grain boundary diffusion, and creating a Dy-saving effect in the dip-coating process. (C) 2014 Elsevier B.V. All rights reserved.
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