首页|Coercivity mechanism of high-performance anisotropic heterostructure SmCo5 magnets

Coercivity mechanism of high-performance anisotropic heterostructure SmCo5 magnets

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Due to its large magnetocrystalline anisotropy field and high Curie temperature,SmCo-based magnets are irreplaceable in high-temperature applications.The hot-deformed SmCo-based magnets are espe-cially attractive for their excellent corrosion resistance,making them more suitable for harsh environ-ments.However,it is still challenging for hot-deformed SmCo-based magnets to obtain high magnetization and high coercivity simultaneously.Therefore,it is necessary to analyze the relationship between its microstructure and magnetic properties and explore its magnetic hardening mechanism to guide the further improvement of magnetic properties.In this paper,the anisotropic heterostructure SmC05 magnet was prepared by combining large height-reduction and introducing a nano-grained Sm-rich phase.Strong c-axis texture,(BH)m of 16.1 MGOe,and Hci of 9.6 kOe were obtained via the heter-ostructure with SmCo5 micron-grain and Sm-rich nano-scale precipitates.The magnetic domain obser-vation and technical magnetization analysis demonstrate that the coercivity mechanism is dominated by nucleation.The results also show that the smooth and Sm-rich precipitated grain boundary provides weak pinning effects.It provides a reference for the development of high-performance nanocrystalline SmCo5 magnets.

Permanent magnetHeterostructureRare earthsCoercivity mechanismHot-deformed SmCo magnet

Yuan Teng、Yuqing Li、Weiqiang Liu、Xiaochang Xu、Zhanjia Wang、Jianjun Yang、Dongtao Zhang、Hongguo Zhang、Qingmei Lu、Qiong Wu、Weixing Xia、Ming Yue

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Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing 100124,China

Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing,100124,China

School of Mechanical and Electrical Engineering,Henan Institute of Science and Technology,Xinxiang,453000,China

School of Mechanical Engineering,Anyang Institute of Technology,Anyang,455000,China

Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

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2024

10.1016/j.jre.2023.10.021

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(10)