Effect of Different Grain Boundary Diffusion Alloys on Magnetic Properties of Dy-Free Sintered NdFeB Magnet
2024 IEEE International Magnetic Conference - Short papers (INTERMAG Short papers)(2024)
摘要
Dy-free sintered magnets were fabricated by blending Neo powder with different grain boundary diffusion (GBD) alloy powders. Cu, CeAl, and CeAlCu have a negative effect on
$\mathrm{H}_{\text{cj}}$
of magnets, while PrAlCu and AlCuGa have a positive effect. PrAlCu alloy achieves the best magnetic properties among all of the GBD alloys. With increasing PrAlCu from 0–10 wt.%,
$\mathrm{H}_{\text{cj}}$
of the magnets gradually increases from the original 14.5 kOe to 19.2 kOe. The magnet with 7.5 wt.% PrAlCu obtains a
$\mathrm{H}_{\text{cj}}$
of 18
$\text{kOe}$
and
$(\text{BH})_{\max}$
of 39.1MGOe. It is found that Pr and Cu in PrAlCu alloy are mainly distributed at the grain boundary and triple junctions, leading to a reduced coupling among grains, thus an enhanced
$\mathrm{H}_{\text{cj}}$
. The grain boundary engineering by adding an appropriate alloy is an effective method to improve
$\mathrm{H}_{\text{cj}}$
of Dy-free magnets.
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关键词
Grain boundary engineering,Magnetic properties,Microstructure,diffusion alloy,Sintered NdFeB magnets
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