Conference Presentation (Other)

FZJ-2024-05886

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Utilizing Field Assisted Sintering for the Recycling of Hot-Deformed Nd-Fe-B Scrap

Bram, M. (Corresponding author)FZJ* ; Keszler, M.FZJ* ; Grosswendt, F. ; Assmann, A.-C. ; Krengel, M. ; Maccari, F. ; Gutfleisch, O. ; Sebold, D.FZJ* ; Guillon, O.FZJ* ; Weber, S.

2024

Abstract: With growing interest in electric vehicles and renewable energy, recycling of Nd-Fe-B magnets will continue to become ongoing challenge for the goal of a circular economy. Due to the microstructure necessary for hot-deformed Nd-Fe-B permanent magnets, state-of-the-art magnet production methods have limitations with regards to the direct recycling of scrap magnet particles with anisotropic microstructure. Recent work has shown that a combination of pre-sintering by Field Assisted Sintering Technology/Spark Plasma Sintering (FAST/SPS) and hot deformation by Flash Spark Plasma Sintering (Flash SPS) has can potentially produce Nd-Fe-B magnets directly from 100% scrap material. A systematic study was done to consolidate a combination of recycled magnet particles and melt-spun powder into a Flash SPS deformed magnet, using a range of weight percentages of scrap material and scrap particle size fractions. In some cases, HcJ of >1400 kAm-1 and Br of 1.1 T could be achieved with 20 wt.% scrap material. The relationship between oxygen uptake, particle size fraction, and percentage of recyclate in a final magnet are all explored and discussed in comparison to magnets produced with pristine material.

---

Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IMD-2)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2024

---