Achieving 2.8 T coercivity in Nd-Fe-B sintered magnets subjected to DyCu and PrCu grain boundary diffusion process

There has been a concern about the over-consumption of scarce and expensive heavy rare-earth elements (HREs), such as Dy and Tb, in achieving high coercivity in Nd-Fe-B magnets. This work reports an approach to achieve a high coercivity of 2.8 T by sequentially diffusing Dy 70 Cu 30 and Pr 68 Cu 32...

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Bibliographic Details
Published in2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) pp. 1 - 2
Main Authors Wang, Zexuan, Sasaki, Taisuke, Une, Yasuhiro, Ohkubo, Tadakatsu, Hono, Kazuhiro
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2023
Subjects
Anisotropic magnetoresistance
Coercive force
Coercivity
Diffusion processes
Grain boundaries
Grain boundary diffusion
Metals
Microstructure
Nd-Fe-B magnet
Perpendicular magnetic anisotropy
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Summary:There has been a concern about the over-consumption of scarce and expensive heavy rare-earth elements (HREs), such as Dy and Tb, in achieving high coercivity in Nd-Fe-B magnets. This work reports an approach to achieve a high coercivity of 2.8 T by sequentially diffusing Dy 70 Cu 30 and Pr 68 Cu 32 eutectic alloys in fine-grained sintered magnets fabricated by a press-less process. The coercivity of 2.8 T was achieved for its low Dy content of only 0.9 wt.%. The Pr 68 Cu 32 diffusion facilitated the infiltration of Dy towards the center of the magnets, resulting in uniform Dy-rich shell formation in the whole sample. Such a unique shell structure increased the anisotropy field of the shell to realize the 2.8 T coercivity.
DOI:10.1109/INTERMAGShortPapers58606.2023.10228264