Attaining high magnetic performance in as-sintered multi-main-phase Nd-La-Ce-Fe-B magnets: Toward skipping the post-sinter annealing treatment

Bai, Guohua; Yan, Mi; Liu, Yongsheng; Peng, Boyu

doi:10.1016/j.actamat.2019.03.005

Cited by 78 publications

(24 citation statements)

References 47 publications

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“…At present, the GBD process can be employed to enhance not only the magnetic properties, but also other service performance such as corrosion resistance. Since the permanent magnets with less critical RE elements emerge rapidly in recent years, such as multi-main phase (MMP) magnets [54,74] and (La,Ce,Y)-Fe-B magnets [75,76], the non-RE diffusion sources are competitive to treat these cost-effective magnets. With the industrialization of GBD, various coating approaches for diffusion sources have been employed, including adhesive coating, electrodeposition, and vapor deposition.…”

Section: Summary and Future Prospectmentioning

confidence: 99%

Grain Boundary Diffusion Sources and Their Coating Methods for Nd-Fe-B Permanent Magnets

Cao

et al. 2021

Metals

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Nd-Fe-B magnets containing no heavy rare earth (HRE) elements exhibit insufficient coercivity to withstand the demagnetization field at elevated temperatures. The grain boundary diffusion (GBD) process provides the best route to fabricate high-coercive Nd-Fe-B magnets with low consumption of expensive HRE resources. Here we give a special review on the grain boundary diffusion sources and their coating methods. Up to now, various types of grain boundary sources have been developed, starting from the earliest Tb or Dy metal. The HRE-M eutectic alloys were firstly proposed for reducing the cost of the diffusion source. After that, the diffusion sources based on light rare earth and even non rare earth elements have also been proposed, leading to new understanding of GBD. Now, the diffusion sources including inorganic compounds, metals, and alloys have been employed in the industry. At the same time, to coat the diffusion source on the magnets before diffusion treatment, various methods have been developed. Different from the previous review articles for GBD, this review gives an introduction of typical types of diffusion sources and their fabrication approaches. The effects of diffusion source on the microstructure and magnetic properties are summarized briefly. In particular, the principles and applicability of different coating approaches were discussed in detail. It is believed that this review can provide a technical guidance for the industry for designing the diffusion process and products meeting specific requirements.

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Section: Summary and Future Prospectmentioning

confidence: 99%

Grain Boundary Diffusion Sources and Their Coating Methods for Nd-Fe-B Permanent Magnets

Cao

et al. 2021

Metals

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“…This change of microstructure weakens the magnetic enhancing effect, leading to the deterioration of the magnetic properties of MMP magnets. 36,37…”

Section: Introductionmentioning

confidence: 99%

Tb–Cu grain boundary diffusion effects on single- and multi-main-phase Nd–Fe–B based magnets

Liu

et al. 2023

J. Mater. Chem. C

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“…Therefore, under the condition of maintaining excellent comprehensive magnetic properties, reducing the use of the rare earth metal Sm is very important to alleviate the pressure on resources and to maintain the sustainable development of resources. The dual main phase alloy method, which has been applied to Nd-Fe-B sintered magnets, [6][7][8][9][10][11][12][13][14][15] can not only make rational and comprehensive use of rare earth resources and reduce the production cost of magnets but also obtain excellent comprehensive magnetic properties. In order to optimize the composition design and heat treatment process of dual main phase magnets, CeCo 5 -SmCo 5 , it is necessary to construct the phase diagram of the CeCo 5 -SmCo 5 pseudobinary system.…”

Section: Introductionmentioning

confidence: 99%

Phase Relationship of the CeCo5-SmCo5 Pseudobinary System

Tian

Yang

et al. 2022

JOM

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The phase relationships of the CeCo 5 -SmCo 5 pseudobinary system have been studied by means of x-ray powder diffraction (XRD), differential thermal analysis (DTA), thermogravimetric measurements (TGM), and scanning electron microscopy equipped with energy dispersive x-ray spectroscopy (SEM-EDS). The XRD results show that continuous solid solutions were formed in this CeCo 5 -SmCo 5 pseudobinary system, and all the (Ce, Sm)Co 5 solid solutions belong to a hexagonal structure with space group P6/mmm. With the increase of Sm content x, the lattice parameter, a, and the cell volume, V, of (Ce 1Àx Sm x )Co 5 solid solutions increase linearly, but its lattice parameter, c, decreases linearly. The DTA measurements show that the temperature of the peritectic reaction L + (Ce, Sm) 2 Co 17 fi (Ce, Sm)Co 5 , the liquid phase transition temperature of the reaction L fi L + (Ce, Sm) 2 Co 17 , and the Curie temperature of the (Ce 1Àx Sm x )Co 5 alloys increase almost linearly as x increases from 0 to 1.0. Based on the XRD results and DTA data, the tentative vertical section of the CeCo 5 -SmCo 5 pseudobinary phase diagram has been constructed.

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Attaining high magnetic performance in as-sintered multi-main-phase Nd-La-Ce-Fe-B magnets: Toward skipping the post-sinter annealing treatment

Cited by 78 publications

References 47 publications

Grain Boundary Diffusion Sources and Their Coating Methods for Nd-Fe-B Permanent Magnets

Grain Boundary Diffusion Sources and Their Coating Methods for Nd-Fe-B Permanent Magnets

Tb–Cu grain boundary diffusion effects on single- and multi-main-phase Nd–Fe–B based magnets

Phase Relationship of the CeCo5-SmCo5 Pseudobinary System

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