α-Fe含量对NdFe10.5Mo1.5N/Xwt% α-Fe复相永磁合金-中国材料进展

文章信息/Info

Title:: The Influence of α-Fe Content on the Microstructure and Magnetic Properties of NdFe10.5Mo1.5N/Xwt% α-Fe Multiphase Permanent Magnet Alloy

Author(s):: YIN Haolun; ZHU Zijian; MI Hongyao; FENG Yunli; College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China

Keywords:: NdFe10.5Mo1.5N/Xwt% α-Fe alloy; microstructure; exchange coupling; magnetic property; saturation magnetization

摘要:: 从微观结构和磁性能两个方面研究了α-Fe含量对NdFe10.5Mo1.5N/Xwt% α-Fe复相永磁合金的影响。合金铸锭均由αFe(Mo)相、1∶12相和富Nd相组成，随着α-Fe含量增加，α-Fe(Mo)相含量逐渐增加，1∶12相含量减少。合金薄带晶粒尺寸随着αFe含量的增加而逐渐减小，富Nd相消失，α-Fe(Mo)相含量减少，1∶12相含量增多。薄带球磨后，合金粉末晶粒尺寸随着α-Fe含量的增多逐渐减小，α-Fe(Mo)相含量增多，1∶12相含量减少。合金粉末氮化后由αFe(Mo)相和1∶12相组成，晶粒尺寸随着α-Fe含量增多而细化，促进了软硬磁相间的交换耦合，提高了合金粉末的磁性能。当X=6时，合金粉末氮化晶粒尺寸最小，软硬磁两相之间交换耦合作用增强，磁性能也达到了最佳，剩磁为47.1 A·m2·kg-1，饱和磁化强度为94.8 A·m2·kg-1，矫顽力为0.33 T，最大磁能积为93.13 kJ·m-3。

Abstract:: The effect of α-Fe content on the microstructure and magnetic properties of NdFe10.5Mo1.5N/Xwt% α-Fe multiphase permanent magnetic alloy is studied. The alloy ingots are composed of α-Fe(Mo) phase, 1∶12 phase and Nd-rich phase. With the increase of α-Fe content, α-Fe(Mo) phase content gradually increases and 1∶12 phase content decreases. The grain size of the alloy ribbons gradually decreases with the increase of α-Fe content, the Nd-rich phase disappears, the α-Fe(Mo) phase content decreases and the 1∶12 phase content increases. After ball milling, the grain size of the alloy powder gradually decreases with the increase of α-Fe content, the α-Fe(Mo) phase content increases and the 1∶12 phase content decreases. After nitriding, the alloy powder is composed of α-Fe(Mo) phase and 1∶12 phase, and the grain size is refined with the increase of α-Fe content, which promotes the exchange coupling between soft and hard magnetic phases and improves the magnetic properties of the alloy powder. When X=6, the nitrided grain size of the alloy powder is the smallest, the exchange coupling between the soft and hard magnetic phases is enhanced and the magnetic properties are also the best. The remanence is 47.1 A·m2·kg-1, the saturation magnetization is 94.8 A·m2·kg-1, the coercivity is 0.33 T, and the maximum magnetic energy product is 93.13 kJ·m-3.