Formation and Stability of Hydrides During Hydrogenation of Ndfeb Magnets

Abstract

Demand for magnetsMagnets has increased in the last decades due to their usage in the energy sector. One of the most common magnetsMagnets used for applications such as electronic devices, wind turbines, etc. is Nd2Fe14B (NdFeB). NeodymiumNeodymium (Nd) is one of the critical elements listed by the EU, hence the efficient use and proper recyclingRecycling of Nd-containing materials become of great interest. Hydrogen is commonly used during magnetMagnets production and some hydrogen-assisted recyclingRecycling approaches were also reported. This study reports an analysis of formed hydridesHydrides during hydrogenationHydrogenation of NdFeB magnetsMagnets at up to 400 °C. In addition to experimental results, thermochemical modelingThermochemical modeling was performed by using FactSageFactSage databases to discuss the effect of temperature and pressure on hydrogenationHydrogenation. The study showed that the stability of phases changes with the temperature and pressure which affects the hydrogen content of phases after hydrogenationHydrogenation. © The Minerals, Metals & Materials Society 2025.