Micron-scale 1:5H-based precipitated phase with the lamellar structure of sintered Sm2Co17-based magnets and its potential application

doi:10.1016/j.jmst.2022.12.046

J. Mater. Sci. Technol. ›› 2023, Vol. 153: 159-165.DOI: 10.1016/j.jmst.2022.12.046

• Research Article • Previous Articles Next Articles

Micron-scale 1:5H-based precipitated phase with the lamellar structure of sintered Sm₂Co₁₇-based magnets and its potential application

Nengjun Yu^a,*, Yingchang Li^a, Zesong Ren^a, Minxiang Pan^a, Hangfu Yang^a, Qiong Wu^a, Hongliang Ge^a, Minggang Zhu^b,*, Wei Li^b

^aCollege of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China;
^bDivision of Functional Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2022-10-01 Revised:2022-12-08 Accepted:2022-12-18 Published:2023-08-01 Online:2023-02-26
Contact: *E-mail addresses: nengjunyu@cjlu.edu.cn (N. Yu), mgzhu@sina.com (M. Zhu).

Abstract

Abstract: The excellent thermal stability of magnetic properties of Sm₂Co₁₇-based magnets is their most important feature. However, this stability is reduced when the maximum energy product of Sm₂Co₁₇-based magnets is improved, which is mainly determined by the Fe/Cu distribution of the 2:17R cell and 1:5H cell boundary phases. During the demagnetization process, the Cu-rich 1:5H cell boundary phase with a width of 2-15 nm obstructs the motion of the domain walls, yielding coercivity. Herein, we report a micron-scale Cu/Zr-rich and Fe-lean 1:5H-based precipitated phase with a lamellar structure, probably induced by Sm₂O₃ doping. This structure enables the separate regulation of Fe and Cu distribution for Sm₂Co₁₇-based magnets with Fe-rich 2:17R cell phases and Cu-rich 1:5H cell boundary phases, considerably optimizing the thermal stability of magnetic properties. This discovery can be further developed to produce Sm₂Co₁₇-based magnets with high performance and excellent thermal stability of magnetic properties.

Key words: Sm₂Co₁₇-type magnets, Thermal stability of magnetic properties, 1:5H-based precipitated phase, Element distribution

Nengjun Yu, Yingchang Li, Zesong Ren, Minxiang Pan, Hangfu Yang, Qiong Wu, Hongliang Ge, Minggang Zhu, Wei Li. Micron-scale 1:5H-based precipitated phase with the lamellar structure of sintered Sm₂Co₁₇-based magnets and its potential application[J]. J. Mater. Sci. Technol., 2023, 153: 159-165.

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Micron-scale 1:5H-based precipitated phase with the lamellar structure of sintered Sm₂Co₁₇-based magnets and its potential application

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