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Schäfer, K.; Fim, R.G.T; Maccari, F.; Braun, T.; Riegg, S.; Skokov, K.P.; Koch, D.; Bruder, E.; Radulov, I.; Ahrens, C.H.; Wendhausen, P.A.P.; Gutfleisch, O.
Journal of magnetism and magnetic materials, 10/2023, Letnik: 583Journal Article
Display omitted •Anisotropic Nd-Fe-B bonded magnets were obtained via Laser Powder Bed Fusion.•Mechanical orientation of elongated anisotropic magnetic particles was explored.•As-printed bonded magnets exhibited a mean alignment degree of < cos θ> = 0.73.•Alignment degree can be tailored as a function of the size of the magnetic particles. Nd-Fe-B bonded magnets are an important class of permanent magnets, employed in many technological sectors. Additive Manufacturing (AM) enables the fabrication of net-shape bonded magnets with complex geometries, allowing to tailor their magnetic stray field specifically for a given application. A crucial challenge is the production of magnetically anisotropic components. Approaches presented in the literature up to now required a post-printing procedure or the complex integration of a magnetic field source into the AM process. Here, we present a technique to fabricate anisotropic bonded magnets via Laser Powder Bed Fusion (LPBF) by utilizing the mechanical alignment of anisotropic particles in a single step, without the need for a magnetic field source. Anisotropic bonded magnets were fabricated using a mixture of anisotropic Nd-Fe-B powder (MQA-38–14) and polyamide-12 (PA12). This magnetic powder consists of ellipsoidal particles, where the easy magnetization axis is distributed perpendicular to their longest side, and the mean aspect ratio of 3:1 can be exploited to generate magnetic texture. Depending on the particle size used as feedstock, the degree of alignment (<cosθ>) can be tailored to a maximum of <cosθ> = 0.78. The fabricated anisotropic bonded magnets exhibited a maximum remanence of Jr = 377 mT and an energy product of (BH)max = 28.6 kJ/m3, respectively.
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