Optimized Microstructure and Improved Magnetic Properties of Pr-Dy-Al-Ga Diffused Sintered Nd-Fe-B Magnets

被引：25
作者：
Qu, Pengpeng [1 ,2 ]
Li, Feifei [1 ,2 ]
Rehman, Sajjad Ur [1 ,2 ]
He, Lei [1 ,2 ]
Yu, Xiaoqiang [1 ,2 ]
Huang, Qingfang [1 ,3 ]
Yang, Munan [1 ,2 ,4 ]
Li, Jiajie [1 ,2 ,4 ]
机构：
[1] Jiangxi Univ Sci & Technol, Inst Rare Earth Magnet Mat & Devices IREMMD, Jiangxi Key Lab Rare Earth Magnet Mat & Devices, Ganzhou 341000, Peoples R China
[2] Jiangxi Univ Sci & Technol, Coll Rare Earths, Ganzhou 341000, Peoples R China
[3] Fujian Rare Earth Funct Mat Key Lab, Longyan 364000, Peoples R China
[4] Natl Rare Earth Funct Mat Innovat Ctr, Ganzhou 341000, Peoples R China
来源：
MATERIALS | 2021年 / 14卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Nd-Fe-B magnets; grain boundary diffusion process; magnetic properties; thermal stability; recoil loops; GRAIN-BOUNDARY DIFFUSION; HIGH-COERCIVITY; THERMAL-STABILITY; ENHANCEMENT; CU;
D O I：
10.3390/ma14102583
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The grain boundary diffusion process (GBDP) has become an important technique in improving the coercivity and thermal stability of Dy-free sintered Nd-Fe-B magnets. The influence of Dy70Al10Ga20 and (Pr75Dy25)(70)Al10Ga20 alloys by the GBDP on sintered Nd-Fe-B magnets are investigated in this paper. After diffusing Dy70Al10Ga20 and (Pr75Dy25)(70)Al10Ga20 alloys, the coercivity (H-cj) of the magnets increased from 13.58 kOe to 20.10 kOe and 18.11 kOe, respectively. Meanwhile, the remanence of the magnets decreased slightly. The thermal stability of the diffused magnets was improved by the GBDP. The microstructure shows continuous Rare-earth-rich (RE-rich) grain boundary phases and (Dy, Pr/Nd)(2)Fe14B core-shell structures which contribute to improving the coercivity. Moreover, the Dy concentration on the surface of the (Pr75Dy25)(70)Al10Ga20 diffused magnets decreased with the Pr substitution for the Dy element. The openness of the recoil loops for the (Pr75Dy25)(70)Al10Ga20 diffused magnets is smaller than that of the original magnets and Dy70Al10Ga20 diffused magnets. The results show that the (Pr75Dy25)(70)Al10Ga20 alloys can effectively optimize the microstructure and improve the magnetic properties and thermal stability of the sintered Nd-Fe-B magnets.
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页数：12
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