Enhancing coercivity and thermal stability of(Nd,Y)-Fe-B sintered magnets through lamellar structure design  

作　　者：Xiao-Dong Fan Yu-Hao Li Shuai Cao Guang-Fei Ding Shuai Guo Bo Zheng Ren-Jie Chen A.Ru Yan 

机构地区：[1]CISRI&NIMTE Joint Innovation Center for Rare Earth Permanent Magnets,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China [2]School of Materials Science and Chemical Engineering,Ningbo University,Ningbo,315211,China [3]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Rare Metals》2024年第12期6571-6582,共12页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.52201235);the Natural Science Foundation of Ningbo City(No.2022J308);the Science and Technology Program of Zhejiang Province(No.2024C01145);Ningbo Young Science and Technology Innovation Leading Talents(No.2023QL040);Kunpeng Plan of Zhejiang Province;Ningbo Top Talent Program;the"Pioneer"and"Leading Goose"R&D Program of Zhejiang(No.2022C01020)。

摘　　要：The incorporation of the high-abundance rareearth element Y in(Nd,Y)-Fe-B sintered magnets offers an opportunity to reduce the cost of permanent magnetic materials,while promoting the balanced usage of rare-earth resources.However,the performance of(Nd,Y)-Fe-B magnets prepared using the conventional dual-main-phase(DMP)method undergoes significant degradation due to the strong diffusion ability of Y.To suppress the excessive diffusion of Y,this study presents a macroscopic lamellar magnet preparation scheme.Consequently,the micromagnetic simulations revealed that the multilayer magnets exhibited superior intrinsic performance compared to DMP magnets.Subsequently,the multilayer magnets were prepared by alternately stacking the 0%Y(0Y)and 30%Y(30Y)magnetic powders.The observed magnetic properties demonstrated that the coercvity of the three-layer magnet was~0.23 T higher than that of the DMP magnet,leading to improved coercivity stability at high temperatures.Furthermore,the microstructural observations and elemental analyses indicated the presence of a~200-μm-thick interface layer at the contact site between the 0Y and 30Y magnetic layers.Thus,the proposed approach effectively suppressed the excessive diffusion of Y in(Nd,Y)-Fe-B magnets,thereby enhancing the magnetic performance of the sintered magnets.

关 键 词：Nd-Y-Fe-B magnets COERCIVITY Thermal stability Lamellar structure design 

分 类 号：TM2[一般工业技术—材料科学与工程]