Investigating the properties of recycled NdFeB magnets
Normandie University, ENSICAEN, UNICAEN, CNRS, CRISMAT, Caen, France
2 Université Grenoble Alpes, CNRS, Institut Néel, Grenoble, France
3 Valeo Powertrain Systems, Créteil, France
Accepted: 19 August 2022
Published online: 7 September 2022
We report investigations on the processing by Spark Plasma Sintering (SPS) of RE2Fe14B (RE = Nd, Pr…) powders obtained by hydrogen decrepitation of decommissioned magnets and the magnetic properties of the consolidated magnets. First experiments have been carried out with a commercial powder to make clear the mechanisms occurring during the powder densification. The magnetic properties of the sintered bulks were measured to determine the SPS cycle resulting in the best saturation and remanent magnetization (Ms and Mr, respectively), coercive field (Hc) and stored magnetic energy (BHmax product). The optimized cycle was subsequently applied to a recycled powder. The properties of the magnets obtained after processing the recycled powder are compared to those made with the commercial one.
© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.