Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Bulk Materials: Soft and Hard Permanent Magnets
MA 30.2: Talk
Wednesday, March 19, 2025, 16:30–16:45, H18
Strategies for Nd-Fe-B Magnet Recycling in a Circular Economy — •Aybike Paksoy1, Amrita Khan1, Abdullatif Durgun1, Mario Schönfeldt1,2, Mahmudul Hasan2, Iliya Radulov2, Jürgen Gassmann2, Imants Dirba1, and Oliver Gutfleisch1 — 1TU Darmstadt, Department of Materials and Geosciences, Functional Materials, Peter-Grünberg-Str. 16, 64287 Darmstadt, Germany — 2Fraunhofer IWKS, Fraunhofer Research Institution for Materials Recycling and Resource Strategies, Aschaffenburger Str. 121, 63457 Hanau, Germany
Nd-Fe-B magnets have the highest energy product (BH)max at room temperature, making them the preferred material for various applications. However, their reliance on critical rare earth elements raises significant environmental, economic, and geopolitical challenges, particularly due to China's dominance as the primary global supplier. Both industry and academia are increasingly focusing on recycling end-of-life Nd-Fe-B permanent magnets.For an environmentally friendly product, it is necessary to reduce the criticality and increase the sustainability of rare earth permanent magnets [1]. We compare three advanced recycling routes to produce sustainable Nd-Fe-B magnets without sacrificing their performance. Scrap magnet material is processed via the hydrogen-assisted magnet-to-magnet route as well as the nanocrystalline hot pressing route and spark plasma sintering. The resultant magnetic properties and microstructure are systematically studied comparing the advantages and disadvantages of each process. [1] M. Schönfeldt et al., J. Alloys and Compounds (2023)
Keywords: Nd-Fe-B; Permanent magnet; Recycling; Criticality; Rare earth