Coercivity enhancement of sintered Nd-Fe-B magnets by diffusing TbHx and Tb86Al7Co7 alloy-Reference-Cited by-同舟云学术

Coercivity enhancement of sintered Nd-Fe-B magnets by diffusing TbHx and Tb86Al7Co7 alloy

Published:2023-10-01 Issue:10 Volume:13 Page:
ISSN:2158-3226
Container-title:AIP Advances
language:en
Short-container-title:

Author:

Liang Liwei¹^ORCID,Wang Haifeng²,Liu Renhui¹^ORCID,Ma Pengfei²

Affiliation:

1. Jiang Xi University of Science and Technology 1 , No. 86 Hongqi Road, Zhanggong District, Ganzhou 341000, China

2. Ganjiang Innovation of Academy, Chinese Academy of Science 2 , No. 1 Kexueyuan Road, Ganxian District, Ganzhou 341000, China

Abstract

TbHx and Tb86Al7Co7 alloys were used as diffusion sources to enhance the coercivity of Nd-Fe-B magnets. The coercivity enhancement and microstructure of the magnets were examined after diffusion, and the results showed that the coercivity increased from the original 1525.1 to 2382.4 kA/m and 2274.9 kA/m in Tb86Al7Co7 and TbHx diffused magnets, respectively. This improvement in coercivity was attributed to the formation of a Tb-rich shell and a new NdTb-AlCo-grain-boundary phase. The Tb86Al7Co7 alloy had a higher diffusion efficiency and diffused deeper than the TbHx alloy due to the low melting point of the NdTb-AlCo-grain-boundary phase. The coercivity temperature coefficient of the magnets improved, increasing from the original −0.55%/K to −0.42%/K and −0.44%/K in Tb86Al7Co7 and TbHx diffused magnets, respectively. The Tb86Al7Co7 diffused magnet exhibited better thermal stability than the TbHx diffused magnet, which suggests that Nd-Fe-B magnets could potentially be used at considerably higher temperatures than they are now.

Publisher

AIP Publishing

Subject

General Physics and Astronomy

Link

https://pubs.aip.org/aip/adv/article-pdf/doi/10.1063/5.0147992/18165894/105314_1_5.0147992.pdf

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