Microstructure modification and coercivity enhancement of Nd-Ce-Fe-B sintered magnets by grain boundary diffusing Nd-Dy-Al alloy

Tang, Minghui; Bao, Xiaoqian; Lu, Kening; Sun, Liling; Mu, Xing; Li, Jiheng; Gao, Xuexu

doi:10.1016/j.jmmm.2017.06.116

Cited by 49 publications

(6 citation statements)

References 17 publications

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“…These last elements are selected for improving the GB wettability, e.g. Al [124], [34], for enhancing the corrosion resistance, e.g. Cu [125] and for forming nonmagnetic RE6Fe13Ga phases at GBs [125], [126], [127].…”

Section: Grain Boundary Diffusion Process (Gbdp)mentioning

confidence: 99%

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Delette

2023

Journal of Magnetism and Magnetic Materials

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Section: Grain Boundary Diffusion Process (Gbdp)mentioning

confidence: 99%

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Delette

2023

Journal of Magnetism and Magnetic Materials

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“…The maximum energy product can still reach 43.3 MGOe when the Ce content in the magnet accounts for 30% of the total RE content [15]. Since then, Ce-substituted magnets have attracted renewed interest of researchers and become a new star in industry and academia [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Nowadays dual-main-phase Ce-substituted magnets have been industrialized for several years.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that, for DMP magnets, the inhomogeneity of composition in the microstructure is not allowed to be disrupted during the annealing process. The second is grain boundary diffusing process [21][22][23][24][25][26][27][28]. By this process, the coercivity of the Ce-substituted magnets could be significantly increased by several kOe.…”

Section: Introductionmentioning

confidence: 99%

A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

Shen

Wang

et al. 2023

Phys. Scr.

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In order to give full play to the potential of Nd-Ce-Fe-B magnets and increase the coercivity of magnets with a fixed average composition, the influence of the cooperation effect of anisotropy field and magnetostatic field on their coercivity was studied. We modeled thirteen composition distributions and calculated their coercivity by micromagnetic simulations. The results show that neither the most inhomogeneous composition distribution nor the most homogeneous composition leads to the maximum coercivity. This is due to the variation in a critical field Hcritwhich quantifies the cooperation effect of anisotropy field and magnetostatic field. This work sheds new insights into further enhancing the coercivity of Nd-Ce-Fe-B magnets by subtly adjusting composition distribution, which changes the anisotropy field distribution and the magnetostatic field distribution.

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“…The 'grain boundary diffusion process' (GBDP) is one feasible approach to enhance the coercivity and to minimize the remanence loss of the SMP RE 2 Fe 14 B magnets [17], which has been applied in industry for several years. The diffusion sources are usually RE-containing alloys or compounds [18][19][20][21][22][23][24][25][26][27]. When processed at temperatures in the vicinity of the melting point of the intergranular RE-rich phase, the extra RE atoms diffuse into the 2:14:1 phase grain, reducing the defect density close to the grain surface and forming continuous RE-rich grain boundary (GB) phase.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, only a small fraction of Dy enters the whole magnet, the remanence loss can be minimized simultaneously [18,22,23]. Recently, the GBDP has been applied to the SMP Nd-Ce-Fe-B magnets using Nd-Dy-Al alloy [27], which also results in similar coercivity enhancement.…”

Section: Introductionmentioning

confidence: 99%

Magnetic performance change of multi-main-phase Nd–Ce–Fe–B magnets by diffusing (Nd, Pr)H_x

Zhang

Peng

et al. 2018

J. Phys. D: Appl. Phys.

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The grain boundary diffusion process (GBDP) is effective to enhance coercivity of the singlemain-phase (SMP) RE 2 Fe 14 B (rare earth (RE)) magnets through forming magnetic hardening shells surrounding the hard grain cores. Here, the GBDP was applied to the multi-main-phase (MMP) (Nd, Pr) 22.3 Ce 8.24 Fe bal M 1.0 B 1.0 (wt.%) magnets prepared by sintering the mixture of Ce-free and Ce-containing 2:14:1 powders, which have shown superior magnetic properties, especially coercivity, to the SMP ones at the same average composition. The remanence of the (Nd, Pr)H x diffused magnets increases gradually with the increase of diffusion temperature from 480 to 880 °C, the coercivity, however, slightly decreases. The highest (BH) max of 350.1 kJ m −3 is achieved when diffusing at 680 °C, which is 9.2% higher than 320.7 kJ m −3 for the as-prepared magnet. The remanence increment is due to the diffusion of Nd/Pr into the 2:14:1 phase grains, enlarging the intrinsic saturation magnetic polarization. The slight coercivity reduction is due to the gradual homogenization of RE distribution within the 2:14:1 grains of the undiffused parts, i.e. approaching the 'close to equilibrium (or SMP)' state, which offsets the positive contributions from the enrichment of Nd/Pr in the Ce-rich 2:14:1 phase and the formation of continuous RE-rich intergranular phase. These findings suggest that the GBDP effect on coercivity of the MMP Nd-Ce-Fe-B magnets is distinctly different from the SMP ones, and that the chemical heterogeneity should be carefully controlled to improve the magnetic properties of such high cost-performance permanent magnets.

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Microstructure modification and coercivity enhancement of Nd-Ce-Fe-B sintered magnets by grain boundary diffusing Nd-Dy-Al alloy

Cited by 49 publications

References 17 publications

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

Magnetic performance change of multi-main-phase Nd–Ce–Fe–B magnets by diffusing (Nd, Pr)H_x

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Microstructure modification and coercivity enhancement of Nd-Ce-Fe-B sintered magnets by grain boundary diffusing Nd-Dy-Al alloy

Cited by 49 publications

References 17 publications

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

Magnetic performance change of multi-main-phase Nd–Ce–Fe–B magnets by diffusing (Nd, Pr)Hx

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Magnetic performance change of multi-main-phase Nd–Ce–Fe–B magnets by diffusing (Nd, Pr)H_x