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Tuning magnetic properties, thermal stabilityandmicrostructure of NdFeB magnets with diffusing Pr-Znfilms
Citation
Li, J. J., Huang, X. Y., Zeng, L. L., Ouyang, B., Yu, X. Q., Yang, M. N., Rawat, R. S., & Zhong, Z. C. (2020). Tuning magnetic properties, thermal stability and microstructure of NdFeB magnets with diffusing Pr-Zn films. Journal of Materials Science & Technology, 41, 81-87. https://doi.org/10.1016/j.jmst.2019.09.024
Author
Li, Jiajie
•
Huang, Xiangyun
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Zeng, Liangliang
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Ouyang, Bo
•
Yu, Xiaoqiang
•
Yang, Munan
•
Zhong, Zhenchen
•
Yang, Bin
•
Abstract
Grain boundary diffusion process (GBDP) serves as a promising approach in improving magnetic properties and thermal stability of NdFeB permanent magnets. Herein, non-heavy rare earth Pr-Zn films deposited on the magnet surface using DC-magnetron sputtering system are reported. The thermal stability and coercivity enhancement mechanism of Pr-Zn GBDP magnets were investigated. Results show that the coercivity of Pr-Zn GBDP magnet increases from 963.96 kA m−1 to 1317.14 kA m−1 without any remanence reduction. Notably, the demagnetization curve of Pr-Zn GBDP magnet still remains a high squareness ratio. The temperature coefficient of coercivity and anti-demagnetization ability of Pr-Zn GBDP magnet under high temperatures are improved after GBDP treatment. The well-optimized rare earth-rich (RE-rich) grain boundary phases and high effective anisotropy field of (Nd,RE)2Fe14B magnetic hardening layers surrounding main grains are the key factors to impact the magnetic properties and thermal stability of NdFeB permanent magnets via GBDP treatment.
Date Issued
2020
Publisher
Elsevier
Journal
Journal of Materials Science & Technology
Grant ID
20151BAB216005
3401223391
201703000006
51561009
KJLD14043
Funding Agency
National Natural Science Foundation of China
Higher School Science and Technology Landing Project of Jiangxi Province
Youth Science Foundation Project of Jiangxi Province
Doctoral Start up Foundation of Jiangxi University of Science and Technology
China Scholarship Council