Effect of different grain boundary diffusion alloys on magnetic properties of Dy-free sintered NdFeB magnet

Tang, Wei; Wang, Jing; Pan, Chaochao; Kang, Min-Chul; Zhou, Lin; Kramer, Matthew J.; Cui, Jun; Anderson, Iver E.

doi:10.1109/tmag.2024.3399130

Effect of different grain boundary diffusion alloys on magnetic properties of Dy-free sintered NdFeB magnet

Journal Article · Thu May 09 00:00:00 EDT 2024 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/tmag.2024.3399130· OSTI ID:2367346

^[1]; Wang, Jing ^[1]; ^[1]; Kang, Min-Chul ^[1]; Zhou, Lin ^[2]; ^[1]; ^[1]; Anderson, Iver E. ^[1]

Ames Laboratory (AMES), Ames, IA (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State University, Ames, IA (United States)

Dy-free sintered magnets were fabricated by blending Neo powder with different grain boundary diffusion alloy powders. Cu, CeAl and CeAlCu have a negative effect on H _cj of magnets, while PrAlCu and AlCuGa have a positive effect. The PrAlCu-added magnet achieves the best magnetic properties among all magnets with the additions of different diffusion alloys. With increasing PrAlCu from 0-10 wt.%, H cj of the magnets gradually increases from the original 14.5 kOe to 19.2 kOe. The magnet with 7.5 wt.% PrAlCu obtains a H _cj of 18 kOe and (BH) _max of 39.1 MGOe. It is found that Pr and Cu in PrAlCu alloy is mainly distributed at grain boundary and triple junctions, leading to a reduced coupling among grains, thus an enhanced H _cj. Here, the grain boundary engineering by adding an appropriate alloy is an effective method to improve H _cj of Dy-free NdFeB magnets.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2367346

Report Number(s):: IS-J--11,333

Journal Information:: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 9 Vol. 60; ISSN 0018-9464

Publisher:: Institute of Electrical and Electronics Engineers. Magnetics GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Grain boundary engineering
Magnetic properties
Microstructure
Sintered NdFeB magnets
diffusion alloy

Effect of different grain boundary diffusion alloys on magnetic properties of Dy-free sintered NdFeB magnet

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