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Direct recycling of hot‐deformed Nd–Fe–B magnet scrap by field‐assisted sintering technology

Keszler, Monica ; Grosswendt, Felix ; Assmann, Anna-Caroline ; Krengel, Martin ; Maccari, Fernando ; Gutfleisch, Oliver ; Sebold, Doris ; Guillon, Olivier ; Weber, Sebastian ; Bram, Martin (2024)
Direct recycling of hot‐deformed Nd–Fe–B magnet scrap by field‐assisted sintering technology.
In: Advanced Energy and Sustainability Research, 5 (1)
doi: 10.1002/aesr.202300184
Article, Bibliographie

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Abstract

Recycling of Nd–Fe–B magnets is an ongoing challenge regarding circular economy. State‐of‐the‐art magnet production methods, such as hot deformation, have limitations with respect to direct recycling of magnet scrap particles that differ from pristine melt‐spun Nd–Fe–B powder. Recent work has shown that a combination of presintering by field‐assisted sintering technology/spark plasma sintering (FAST/SPS) and hot deformation by flash spark plasma sintering (flash SPS) has the potential to directly produce Nd–Fe–B magnets from 100% scrap material. Both processes have the capability to adjust and monitor process parameters closely, resulting in recycled magnets with properties similar to commercial magnets but made directly from crushed and recycled Nd–Fe–B powder that partially or completely replaces pristine melt‐spun Nd–Fe–B powder. Herein, a systematic study is done inserting recycled magnet particles into a flash SPS deformed magnet, considering the effects of different weight percentages of scrap material of varied particle size fractions. In some cases, coercivity HcJ of >1400 kAm⁻¹ and remanence Br of 1.1 T can be achieved with 20 wt% scrap material. The relationship between particle size fraction, oxygen uptake, and percentage of recyclate in a final magnet are all explored and discussed with respect to magnets made from pristine material.

Item Type: Article
Erschienen: 2024
Creators: Keszler, Monica ; Grosswendt, Felix ; Assmann, Anna-Caroline ; Krengel, Martin ; Maccari, Fernando ; Gutfleisch, Oliver ; Sebold, Doris ; Guillon, Olivier ; Weber, Sebastian ; Bram, Martin
Type of entry: Bibliographie
Title: Direct recycling of hot‐deformed Nd–Fe–B magnet scrap by field‐assisted sintering technology
Language: English
Date: January 2024
Place of Publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Energy and Sustainability Research
Volume of the journal: 5
Issue Number: 1
Collation: 14 Seiten
DOI: 10.1002/aesr.202300184
Corresponding Links:
Abstract:

Recycling of Nd–Fe–B magnets is an ongoing challenge regarding circular economy. State‐of‐the‐art magnet production methods, such as hot deformation, have limitations with respect to direct recycling of magnet scrap particles that differ from pristine melt‐spun Nd–Fe–B powder. Recent work has shown that a combination of presintering by field‐assisted sintering technology/spark plasma sintering (FAST/SPS) and hot deformation by flash spark plasma sintering (flash SPS) has the potential to directly produce Nd–Fe–B magnets from 100% scrap material. Both processes have the capability to adjust and monitor process parameters closely, resulting in recycled magnets with properties similar to commercial magnets but made directly from crushed and recycled Nd–Fe–B powder that partially or completely replaces pristine melt‐spun Nd–Fe–B powder. Herein, a systematic study is done inserting recycled magnet particles into a flash SPS deformed magnet, considering the effects of different weight percentages of scrap material of varied particle size fractions. In some cases, coercivity HcJ of >1400 kAm⁻¹ and remanence Br of 1.1 T can be achieved with 20 wt% scrap material. The relationship between particle size fraction, oxygen uptake, and percentage of recyclate in a final magnet are all explored and discussed with respect to magnets made from pristine material.

Uncontrolled Keywords: circular economy, field assisted sintering, functional materials, permanent magnets, rare earth elements, recycling
Identification Number: Artikel-ID: 2300184
Classification DDC: 300 Social sciences > 333.7 Natural resources, energy and environment
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 29 May 2024 06:14
Last Modified: 29 May 2024 09:01
PPN: 518707342
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