Permanent magnetic materials play an increasingly important role for technologies in the fields of energy generation, mobility, as well as in automation and entertainment industry. The production of permanent magnets has taken a strong upturn in the last decade, and the demand for magnets has increased dramatically due to the increasing automation, as well as the change from combustion engines to electromobility.
Due to their high magnetic energy density, the neodymium-iron-boron (Nd-Fe-B) alloys are among the most important permanent magnet materials. However, this alloy is permanent-magnetic only if it has a specific microstructure (e.g. as small as possible grain-size and magnetic texture). The conventional Nd-Fe-B magnets production nowadays takes place via a powder metallurgical route through sintering, which is a complex manufacturing process and associated with high costs in the value added.
In the project “New top-down synthesis methods” of the LOEWE RESPONSE project at the TU Darmstadt, a forming process route was developed and patented by the departments PtU, PhM and FM starting from Nd-Fe-B castings. The goal of this process route is a cheap and efficient production of Nd-Fe-B permanent magnets compared to the classical powder route by means of a continuous forming process. The previous results have demonstrated the high potential of this process route by achieving significant magnetic hardening (increase in remanence and coercivity).
The proposed research project is funded by by TU Darmstadt and ENTEGA NATURpur Institut GmbH.