Coercivity enhancement by Zn addition in hot deformed NdFeB magnets

Liu, Ying; Kim, Y.B.; Yoon, T.S.; Suhr, Dong Soo; Kim, T.K.; Kim, C.O.

doi:10.1016/s0304-8853(01)01285-9

Cited by 20 publications

(2 citation statements)

References 7 publications

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“…Theoretically, small amounts of Zn may be tolerable in the recycled material, as Zn evaporates during the sintering of recycled NdFeB magnets before the densification temperature is reached. The beneficial effects on Zn addition have been found by adding Zn via single-stage hot working [ 45 ], which is an entirely different procedure with mechanisms that cannot be compared to a possible Zn integration via sintering. However, larger amounts can damage the equipment or cause pores and fractures in the magnets due to the high vapor pressure.…”

Section: Discussionmentioning

confidence: 99%

Processability and Separability of Commercial Anti-Corrosion Coatings Produced by In Situ Hydrogen-Processing of Magnetic Scrap (HPMS) Recycling of NdFeB

Grau,

Fleissner,

Kobe

et al. 2024

Materials

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The recycling of NdFeB magnets is necessary to ensure a reliable and ethical supply of rare earth elements as critical raw materials. This has been recognized internationally, prompting the implementation of large-scale legislative measured aimed at its resolution; for example, an ambitious recycling quote has been established in the Critical Raw Materials Act Successful recycling in sufficient quantities is challenged by product designs that do not allow the extraction and recycling of these high-performance permanent magnets without excessive effort and cost. This is particularly true for smaller motors using NdFeB magnets. Therefore, methods of recycling such arrangements with little or no dismantling are being researched. They are tested for the hydrogen-processing of magnetic scrap (HPMS) method, a short-loop mechanical recycling process. As contamination of the recycled material with residues of anti-corrosion coatings, adhesives, etc., may lead to downcycling, the separability of such residues from bulk magnets and magnet powder is explored. It is found that the hydrogen permeability, expansion volume, and the chosen coating affect the viable preparation and separation methods as recyclability-relevant design features.

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Section: Discussionmentioning

confidence: 99%

Processability and Separability of Commercial Anti-Corrosion Coatings Produced by In Situ Hydrogen-Processing of Magnetic Scrap (HPMS) Recycling of NdFeB

Grau,

Fleissner,

Kobe

et al. 2024

Materials

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“…Single stage hot deformation (SSHD) process is one of the methods which simplifies the traditional hot-pressing and die-upsetting process as one step hot press and replaces the sample die with copper tube. In previous work [5][6][7], we have done intensive research on the magnetic properties of the materials affected by raw materials, the fabrication process, etc. This study will focus on the microstructure of the single stage hot deformed Nd-Fe-B magnets in order to understand the origin of anisotropy in SSHD magnets.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of single stage hot deformed anisotropic Nd–Fe–B magnets

Hao

Liu

Zhu

et al. 2007

Phys. Status Solidi (c)

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Single stage hot deformation (SSHD) process is an effective method to fabricate anisotropic magnet. In this study, the influences of particle size and hot press temperature on microstructure were discussed, respectively. Anisotropic magnetic properties are affected by SSHD process conditions through the changing the microstructure of the magnets. SEM investigation shows that, good magnetic properties related with suitable geometric shapes of the grains and their better alignment. Good alignment could be obtained when the particle size of raw material MQPA powders is between 45~100 µm and the SSHD magnet is made at 700 °C. When the deformation temperature is below the melting temperature of Nd rich phase, the platelet-shaped Nd 2 Fe 14 B grains could not be formed.

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Recent Development of Hot-Pressed-/Deformed Nd–Fe–B Permanent Magnets

Dong

Zhao

et al. 2019

Springer Proceedings in Physics

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Coercivity enhancement by Zn addition in hot deformed NdFeB magnets

Cited by 20 publications

References 7 publications

Processability and Separability of Commercial Anti-Corrosion Coatings Produced by In Situ Hydrogen-Processing of Magnetic Scrap (HPMS) Recycling of NdFeB

Processability and Separability of Commercial Anti-Corrosion Coatings Produced by In Situ Hydrogen-Processing of Magnetic Scrap (HPMS) Recycling of NdFeB

Microstructure of single stage hot deformed anisotropic Nd–Fe–B magnets

Recent Development of Hot-Pressed-/Deformed Nd–Fe–B Permanent Magnets

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