Design of High-Remanence Nd-Fe-B Hot-Pressed Magnets by Manipulating Coercivity of Hydrogenation-Disproportionation-Desorption-Recombination Treated Anisotropic Precursors

被引:3
作者
Yoo, Jae-Gyeong [1 ,2 ]
Kim, Tae-Hoon [1 ]
Cha, Hee-Ryoung [1 ]
Kim, Yang-Do [2 ]
Lee, Jung-Goo [1 ]
机构
[1] Korea Inst Mat Sci, Dept Magnet Mat, Chang Won 51508, South Korea
[2] Pusan Natl Univ, Dept Mat Sci & Engn, Busan 46241, South Korea
关键词
Nd-Fe-B permanent magnets; HDDR powders; magnetic alignment process; hot-press process; MELT-SPUN; MICROSTRUCTURE; ENHANCEMENT; ALIGNMENT; POWDERS;
D O I
10.3390/ma16247599
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
We propose a method of manipulating the coercivity of anisotropic hydrogenation-disproportionation-desorption-recombination (HDDR) powders to fabricate high-remanence and fine-grained Nd-Fe-B magnets using only hot-pressing without a subsequent hot-deformation process. By reducing the Nd content of anisotropic HDDR precursors such that their coercivity (Hcj) is lowered, the c-axis of each HDDR particle is well-aligned parallel to the direction of the applied magnetic field during the magnetic alignment step. This is because the magnetic repulsive force between adjacent particles, determined by their remanent magnetization, decreases as a result of the low coercivity of each particle. Therefore, after hot-pressing the low-Hcj HDDR powders, a significantly higher remanence (11.2 kG) is achieved in the bulk than that achieved by hot-pressing the high-Hcj HDDR powders (8.2 kG). It is clearly confirmed by the large-scale electron backscatter diffraction (EBSD) analysis that the alignment of the c-axis of each anisotropic HDDR particle in the bulk is improved when low-Hcj HDDR powders are used to fabricate hot-pressed magnets. This coercivity manipulation of HDDR powders can be a helpful method to expand the use of HDDR powders in fabricating anisotropic Nd-Fe-B bulk magnets.
引用
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页数:11
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