Forschungszentrum Jülich GmbH
With the mining of rare earth elements constricted to a few geographic regions, finding ways to recycle Nd-Fe-B magnets has been of great interest. Nd-Fe-B magnets are key to many modern technologies, including in green energy and e-mobility. Direct recycling of hot-deformed Nd-Fe-B magnets would avoid the use of high energy for remelting or environmentally unfriendly acids for leaching. Recent work has shown the possibility of directly recycling hot-deformed Nd-Fe-B magnets via Field Assisted Sintering Technology/Spark Plasma Sintering (FAST/SPS) and hot deformation by Flash Spark Plasma Sintering (Flash SPS). In some cases, HcJ of >1400 kAm-1 and Br of 1.1 T could be achieved with 20 wt.% scrap material. Further methods of using field-assisted technology to deform Nd-Fe-B has been explored in this work, with the goal of further optimizing performance in a 100% recycled magnet to be used as a demonstrator part in a motor.
Abstract
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