Grain boundary diffusion of Dy films prepared by magnetron sputtering for sintered Nd-Fe-B magnets

Dy films, deposited on the surface of sintered Nd-Fe-B magnets by magnetron sputtering, were employed for grain boundary diffusion source. High coercivity sintered Nd-Fe-B magnets were successfully prepared. Effects of sputtering power and grain boundary diffusion processes (GBDP) on the microstruct...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2018-04, Vol.51 (18), p.185001
Main Authors: Chen, W, Luo, J M, Guan, Y W, Huang, Y L, Chen, M, Hou, Y H
Format: Article
Language:English
Subjects:
coercivity
Dy films
magnetron sputtering
RE-rich phases
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Summary:Dy films, deposited on the surface of sintered Nd-Fe-B magnets by magnetron sputtering, were employed for grain boundary diffusion source. High coercivity sintered Nd-Fe-B magnets were successfully prepared. Effects of sputtering power and grain boundary diffusion processes (GBDP) on the microstructure and magnetic properties were investigated in detail. The dense and uniform Dy films were beneficial to prepare high coercivity magnets by GBDP. The maximum coercivity value of 1189 kA m−1 could be shown, which was an amplification of 22.3%, compared with that of as-prepared Nd-Fe-B magnet. Furthermore, the improved remanence and maximum energy product were also achieved through tuning grain boundary diffusion processes. Our results demonstrated that the formation of (Nd, Dy)2Fe14B shell surrounding Nd2Fe14B grains and fine, uniform and continuous intergranular RE-rich phases jointly contribute to the improved coercivity.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aab912