Effect of different grain boundary diffusion alloys on magnetic properties of Dy-free sintered NdFeB magnet
IEEE Transactions on Magnetics(2024)
摘要
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
. The grain boundary engineering by adding an appropriate alloy is an effective method to improve H
cj
of Dy-free NdFeB magnets.
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关键词
Grain boundary engineering,Magnetic properties,Microstructure,diffusion alloy,Sintered NdFeB magnets
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