Achievement of high performance of sintered R-Fe-B magnets based on misch metal doped with PrNd nanoparticles

作者：Ma, Qiang; Zhu, Jian-Teng; Zhang, Xue-Feng^*; Zhao, Zeng-Ru; Liu, Yan-Li; Wang, Gao-Feng; Li, Yong-Feng; Li, Zhu-Bai

来源：Rare Metals, 2018, 37(3): 237-242.

DOI：10.1007/s12598-017-0887-8

• Permanent magnetic materials
• Nanoparticles
• Misch metal
• Dual-alloy
• Coercivity

The magnetic properties and microstructure of sintered R-Fe-B (R, rare earth) magnets with nominal composition of ((PrNd)(1-x) MM (x) )(30)FebalB1 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.7; MM, misch metal) prepared using dual-alloy method were investigated. For x = 0.3, the maximum energy product ((BH)(max)) of the sintered magnet is higher than 318.4 kJ center dot m(-3), but intrinsic coercivity (H (cj)) is lower than 351.8 kA center dot m(-1). The La and Ce contents are obviously different in some matrix-phase grains, which proves that the multi-hard magnetic phases (La, Ce-rich and La, Ce-lean) exist in the magnets. The coercivity is improved by the method of doping PrNd nanoparticles without sacrificing other magnetic properties. An enhancement in coercivity from 517.2 to 872.9 kA center dot m(-1) is achieved by doping 5 wt% PrNd nanoparticles. Meanwhile, it could exhibit better magnetic properties (remanence B (r) = 1.332 T, intrinsic coercivity H (cj) = 872.9 kA center dot m(-1), maximum energy product (BH)(max) = 318.6 kJ center dot m(-3)) and make the distribution of the intergranular phase become more homogeneous.

• 出版日期2018-3
• 单位内蒙古科技大学