High-performance anisotropic SmCo-based magnet with novel microstructure  

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

机构地区：[1]College of Materials and Chemistry,China jiliang University,Hangzhou 310018,China [2]Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Rare Earths》2024年第8期1539-1545,I0005,共8页稀土学报（英文版）

基　　金：supported by the National Key R&D Program of China(2021YFB3501600);the Young Elite Scientists Sponsorship Program by CAST(2022QNRC001);the Key R&D Program of Zhejiang Province(2021C01191,2021C01190,2023C01077)。

摘　　要：A novel micro structure of magnetically anisotropic Sm Co-based magnet with high-performance is reported.The magnet consists of SmCo_(7)-H(TbCu_(7)-hexagonal type),Sm_(2)Co_(17)-H(Th_(2)Ni_(17)-hexagonal type)and SmCo_(3)-R(SmCo_(3)-rhombohedral type)phases.The maximum magnetic energy product of the magnet is 231.69 kj/m^(3),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 Sm_(2)Co_(17)-based sintered magnets.The initial magnetization curve indicates that the coercivity mechanism is controlled by a domain wall pinning mechanism.The SmCo_(3)-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.

关 键 词：Rare earths Permanent magnet Composite magnet MELT-SPINNING MICROSTRUCTURE 

分 类 号：TM273[一般工业技术—材料科学与工程]