Zobrazit v EDS

Effect of pre-treatment on magnetic properties of Nd-Fe-B permanent magnet during grain boundary diffusion process.

Uloženo v:
Podrobná bibliografie
Název: Effect of pre-treatment on magnetic properties of Nd-Fe-B permanent magnet during grain boundary diffusion process.
Autoři: Joo, Hyun Bin1,2 (AUTHOR), Choi, Seong Min1 (AUTHOR), Jeong, Se Rin1 (AUTHOR), Oh, Soong Ju2 (AUTHOR), Park, Seung-Yeon1 (AUTHOR) ssica418@kitech.re.kr, Lim, Kyoung-Mook1 (AUTHOR) mook@kitech.re.kr
Zdroj: Powder Metallurgy. Aug2025, Vol. 68 Issue 4, p383-389. 7p.
Témata: *KIRKENDALL effect, *PERMANENT magnets, *MAGNETIC properties, *MAGNETS, *DYSPROSIUM
Abstrakt: In this study, a pre-treatment process was introduced into the grain boundary diffusion process (GBDP) to improve the diffusion efficiency of the source materials into permanent magnets during GBDP using metal ribbon-type sources. Dysprosium (Dy)-based alloy ribbons manufactured by the melt-spin method were used as source materials for the GBDP of the permanent magnets. The microstructure and magnetic properties of the Nd-Fe-B permanent magnets were analyzed to understand the effects of the pre-treatment process. After the pre-treatment process, the diffusion depth of Dy into magnet slightly increased and the Dy content in the heavy rare earth (HRE)-shell also increased. The core-shell structure with a clearly formed HRE shell was observed at a depth of 300 μm from the magnet surface in both pretreated and unpretreated magnets. However, a slight decrease in coercivity was observed in the pre-treated specimens, which was attributed to the formation of rare-earth (RE) oxide. The oxidation control is needed to apply pre-treatment to GBDP using ribbon type metal sources. [ABSTRACT FROM AUTHOR]
Databáze: Academic Search Index
Popis
Abstrakt:In this study, a pre-treatment process was introduced into the grain boundary diffusion process (GBDP) to improve the diffusion efficiency of the source materials into permanent magnets during GBDP using metal ribbon-type sources. Dysprosium (Dy)-based alloy ribbons manufactured by the melt-spin method were used as source materials for the GBDP of the permanent magnets. The microstructure and magnetic properties of the Nd-Fe-B permanent magnets were analyzed to understand the effects of the pre-treatment process. After the pre-treatment process, the diffusion depth of Dy into magnet slightly increased and the Dy content in the heavy rare earth (HRE)-shell also increased. The core-shell structure with a clearly formed HRE shell was observed at a depth of 300 μm from the magnet surface in both pretreated and unpretreated magnets. However, a slight decrease in coercivity was observed in the pre-treated specimens, which was attributed to the formation of rare-earth (RE) oxide. The oxidation control is needed to apply pre-treatment to GBDP using ribbon type metal sources. [ABSTRACT FROM AUTHOR]
ISSN:00325899
DOI:10.1177/00325899251345414