Enormous improvement of the coercivity of Ga and Cu co-doping Nd-Fe-B sintered magnet by post-sinter annealing
Huang, Qingfang 1Jiang, Qingzheng 1Shi, Yao 2Rehman, Sajjad Ur 1Wei, Xing 3Li, Zhixiang 1Shi, Dawei 2Xu, Deqin 3Zhong, Zhenchen1
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作者信息
1. Jiangxi Univ Sci & Technol
2. Xiamen Tungsten Co Ltd
3. Fujian Key Lab Rare Earth Funct Mat
折叠
Abstract
Post-sinter annealing is essential to improve the microstructures and magnetic properties in NdFeB-based sintered permanent magnetic materials. In this paper, investigated systemically are the effects of post-sinter annealing on the microstructures and magnetic performance of Ga and Cu co-doping Nd2Fe14B based sintered magnets. It is found out that the intrinsic coercive force of the magnets increased from 9.17 kOe to 18.67 kOe after two stage post-sinter annealing (PSA), which shows an extraordinary increment of 103.5%. The remanence, with a decreasing percentage of 1.95%, slightly decreases from 13.87 kGs to 13.60 kGs. The substantial increase of intrinsic coercivity is mainly attributed to the improvement of clean and thin continuous grain boundary layers, the smoothness of hard magnetic matrix phase and the appearance of the RE6(Fe, M)(14) antiferromagnetic phase during annealing. The reduction of the remanence is caused by the deteriorated orientation degree and reduced volume fraction of hard magnetic main phases after post sinter annealing. (C) 2021 Elsevier B.V. All rights reserved.
Key words
Magnetic properties/Nd-Fe-B magnet/Microstructure/Post-sinter annealing/Coercivity/NUCLEATION CONTROLLED MAGNETS/GRAIN-BOUNDARY PHASE/FREE RARE-EARTH/PERMANENT-MAGNETS/MAGNETIZATION REVERSAL/MICROSTRUCTURE/PERFORMANCE/AL/PR/ENHANCEMENT
NSTL
Elsevier