Study on Elemental Distribution and Magnetic Properties of RE-Fe-B Sintered Magnets with High Ce Content AITranslate

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Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]

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To develop commercially valuable RE-Fe-B magnets with high Ce content and improve the utilization of high abundance rare earth Ce,the magnetic properties and microstructure of RE-Fe-B magnets with different substitution amounts of Ce were investigated.The experimental results show that the dual main phase magnet with a Ce/(Ce+Nd)mass fraction of 40%still maintains excellent magnetic properties,with a remanence B_rreaching 1.31 T,and a maximum energy product(BH)_maxreaching 310.56 kJ/m³.In single and dual main phase magnets with a Ce substitution of 40%,differences appear in the displacement beha-vior of Nd and Ce elements.In single and dual main phase magnets,Nd element tends to enter the main phase grains,while Ce element tends to aggregate in the grain boundary phase or the surface layers of the main phase grains.In addition,the Ce-poor main phase and(Nd_0.6Ce_0.4)_30.5(Fe,M)_balB_0.97main phase close to the nominal component are formed in the dual main phase magnet.The magnetization behavior of single and dual main phase magnets was analyzed by observing magnetic domain switching,and the enhancement mechanism of coercivity in the dual main phase magnets was studied.The high anisotropy field of the Ce-poor main phase imposes the pinning effect on the magnetic moment of the Ce-rich main phase.The study of the diffusion behavior of Nd and Ce elements provides a basis for the preparation of commercial RE-Fe-B magnets with high Ce content and superior magnetic properties.