SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.34: Poster

Thursday, September 30, 2021, 13:30–16:30, P

Qualification of rapidly quenched permanent magnet powders applied in additive manufacturing — •Tobias Braun¹, Lukas Schäfer¹, Stefan Riegg¹, Iliya Radulov¹, Imants Dirba¹, Esmaeil Adabifiroozjaei², Konstantin P. Skokov¹, Leopoldo Molina-Luna², and Oliver Gutfleisch¹ — ¹Funktionale Materialien, Material- und Geowissenschaften, Technische Universität Darmstadt, Germany — ²Advanced Electron Microscopy, Material- und Geowissenschaften, Technische Universität Darmstadt, Germany

Additive manufacturing (AM) of permanent magnets has been an important research field in recent years due to its potential for near net shape processing of complex geometries with tailored stray field distribution and therefore better use of mostly resource-critical materials. One of the most applied materials in production of fully dense metallic magnets by LPBF is the rare-earth lean Nd-Fe-B based, atomized commercial material MQP-S by Magnequench. The powder qualifies due to spherical shape and size for the use in LPBF. The exchange-coupling mechanism induced by the two-phase nanostructure results in significant coercive fields and enhanced remanences, both however can be strongly reduced during the LPBF process.

The influence of the AM process on the magnetic properties is studied in detail by advanced magnetic and transmission electron microscopic characterization methods supported by temperature dependent x-ray diffraction and differential thermal analysis. Based on this, we review reported results on printed materials allowing a critical view on the powder material choice in AM.