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High-performance anisotropic SmCo-based magnet with novel micro structure

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A novel microstructure of magnetically anisotropic SmCo-based magnet with high-performance is re-ported.The magnet consists of SmCo7-H(TbCu7-hexagonal type),Sm2Co17-H(Th2Ni17-hexagonal type)and SmCo3-R(SmCo3-rhombohedral type)phases.The maximum magnetic energy product of the magnet is 231.69 kJ/m3,and the intrinsic coercivity is 1005.47 kA/m.An outstanding intrinsic coercivity temperature coefficient(β)of-0.125％/K between 298 and 773 K is obtained,which is very close to theβof commercial high-temperature Sm2Co17-based sintered magnets.The initial magnetization curve in-dicates that the coercivity mechanism is controlled by a domain wall pinning mechanism.The SmCo3-R lamellar phase may be a potential pinning center or self-pinning center.The microstructure of the magnet is different from that of any previous SmCo-based magnets.These findings provide a new idea for preparing high-performance SmCo-based permanent magnets.

Rare earthsPermanent magnetComposite magnetMelt-spinningMicrostructure

Yingchang Li、Zicao Xing、Nengjun Yu、Zesong Ren、Minxiang Pan、Qiong Wu、Hongliang Ge、Minggang Zhu、Wei Li

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College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China

Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing 100081,China

National Key R&D Program of ChinaYoung Elite Scientists Sponsorship Program by CASTKey R&D Program of Zhejiang ProvinceKey R&D Program of Zhejiang ProvinceKey R&D Program of Zhejiang Province

2021YFB35016002022QNRC0012021C011912021C011902023C01077

2024

10.1016/j.jre.2023.08.006

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(8)
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