Metal Injection Moulding of NdFeB Based on Recycled Powders

Philipp Imgrund, Oxana Weber, Thomas Schlauf, Karsten Pischang, Lydia Pickering, Allan Walton, Joamin Gonzalez-Gutierrez, Christian Kukla, Carlo Burkhardt

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in Konferenzband

1 Zitat (Scopus)


Over the last ten years several groups have been carrying out research into metal injection moulding (MIM) of neodymium-iron-boron (NdFeB) powders to produce isotropic or anisotropic rare earth magnets with higher complexity than in the conventional press and sintering approaches. However, difficult processability due to the high affinity of the powder to oxygen and carbon pickup remains problematic in terms of obtaining sufficient remanence and coercivity. In this paper, a new approach to MIM of NdFeB magnets is presented. It is based on the use of powder obtained from recycling of used rare earth magnets by the hydrogen decrepitation (HD) process. Different types of binder systems have been used for producing mouldable MIM feedstock. Influence of debinding and sintering conditions on interstitial contents and magnetic properties of sintered MIM parts are presented and discussed. Magnets with a remanence of 570 mT, a coercivity of 970 kA/m and an energy product of 57 kJ/m³ could be produced without additional heat treatment.
TitelWorld PM2016 Congress & Exhibition
Redakteure/-innenFrank Petzoldt
ErscheinungsortHamburg, Germany
Herausgeber (Verlag)European Powder Metallurgy Association
PublikationsstatusVeröffentlicht - 9 Okt. 2016
VeranstaltungPowder Metallurgy World Congress and Exhibition - Congress Centrum Hamburg, Hamburg, Deutschland
Dauer: 9 Okt. 201613 Okt. 2016


KonferenzPowder Metallurgy World Congress and Exhibition
KurztitelWorld PM 2016

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