Microstructure evolution and coercivity enhancment of sintered Nd–Fe–B magnets by grain boundary diffusion with Cu aided TbF3 | Zendy

Xi Gao | Zendy; Jun Li | Zendy; Wei Zhao | Zendy; Ying Liu | Zendy; Renquan Wang | Zendy; Lele Liao | Zendy

Open Access

Microstructure evolution and coercivity enhancment of sintered Nd–Fe–B magnets by grain boundary diffusion with Cu aided TbF₃

Author(s) -

Xi Gao,

Jun Li,

Wei Zhao,

Ying Liu,

Renquan Wang,

Lele Liao

Publication year - 2019

Publication title -

materials research express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.383

H-Index - 35

ISSN - 2053-1591

DOI - 10.1088/2053-1591/ab56f4

Subject(s) - coercivity , grain boundary , grain boundary diffusion coefficient , materials science , microstructure , diffusion , magnet , metallurgy , grain size , analytical chemistry (journal) , nuclear magnetic resonance , condensed matter physics , thermodynamics , chemistry , physics , chromatography , quantum mechanics

Compared with the TbF 3 grain boundary diffusion (GBD) magnet, in this study, Cu aided TbF 3 GBD was applied to Nd-Fe-B magnets to further improve the coercivity. It is found that the coercivity increased sharply from 17.42 kOe to 25.43 kOe when the diffusion source is the mix powders of Cu and TbF 3 , higher than 21.25 kOe with single TbF 3 as the diffusion source. The wettability of the grain boundary phases were improved owing to the accumulation of Cu in grain boundary. The grains were uniformly enveloped by grain boundary phase with the help of Cu addition. The microstructure analysis indicated that the diffusion depth of Tb increased significantly due to the modified grain boundaries which offered better tunnels for the diffusion of Tb.

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