Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 32: Bulk Materials: Soft and Hard Permanent Magnets
MA 32.4: Talk
Thursday, September 8, 2022, 15:45–16:00, H43
Influence of filler morphology, arrangement and filling fraction on the magnetic properties of polymer-bonded magnets produced by laser powder bed fusion — •Kilian Schäfer1, Tobias Braun1, Stefan Riegg1, Jens Musekamp2, and Oliver Gutfleisch1 — 11Functional Materials, Institute of Materials Science, , Technical University Darmstadt, Darmstadt — 22Institute for Materials Technology (MPA-IfW), Technical University Darmstadt, Grafenstraße 2, D-64283 Darmstadt
Bonded permanent magnets are key components in many energy conversion, sensor and actuator devices. These applications need high magnetic performance, customizability, and freedom of shape. With additive manufacturing processes, for example laser powder bed fusion (LPBF), it is possible to produce bonded magnets with tailored stray field distribution.
Up to now, most studies use spherical powders as magnetic fillers due to their good flowability. Here, the behavior of large SmFeN platelets with a high aspect ratio as filler material and its influence on the arrangement and the resulting magnetic properties were examined. To study the distribution and orientation of the magnetic filler in 3D, computed tomography measurements were conducted and analyzed with the open-source software ImageJ. It is shown that the plateletshaped particles align themselves perpendicular towards the buildup direction during the process. In addition, the effect of filling fraction on the magnetic properties of the composites is investigated.