Development of Dy-free Nd-Fe-B-based sintered magnet through grain boundary engineering using Pr-Cu alloys

Journal Article · 02 June 2023 · IEEE Transactions on Magnetics

DOI: https://doi.org/10.1109/tmag.2023.3282430 · OSTI ID:1986177

Tang, Wei  ^[1]; Ouyang, Gaoyuan  ^[1]; Wang, Jing ^[1]; Dasari, Harika ^[2]; Kramer, Matthew J. ^[3]; Anderson, Iver E. ^[3]; Cui, Jun ^[3]

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1. Ames Laboratory (AMES), Ames, IA (United States)
2. Iowa State Univ., Ames, IA (United States)
3. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

For this study, Dy-free sintered magnets were fabricated by mixing Nd-Fe-B powder with various amounts of Pr-Cu powder followed by the common procedures for making Nd-Fe-B based sintered magnets. With the Pr-Cu addition increasing from 0 to 10 wt.%, the obtained magnets’ H_cj increases from the original 14.5 kOe to 18.6 kOe. The highest (BH)_max achieved was 35.0 MGOe with 7.5 wt.% PrCu. The distribution of the Pr and Cu elements was primarily at grain boundary and triple junctions, leading to a reduced coupling among grains, thus an enhanced H_cj.

• 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: 1986177
• Report Number(s): IS-J-11,072
• Journal Information: IEEE Transactions on Magnetics, Vol. 59, Issue 11; ISSN 0018-9464
• Publisher: Institute of Electrical and Electronics Engineers. Magnetics GroupCopyright Statement
• Country of Publication: United States
• Language: English