Additive-manufactured anisotropic magnets for harsh environments
Journal article, 2023

We describe the fabrication of SrFe12O19-based filaments, using polyphenylene sulphide (PPS) as the binder for the magnetic particles, and the subsequent printing of this filament with a 3D printer. PPS is an ideal polymer for applications in harsh environments, making it applicable for the automotive industry, where it is widely used with injection moulding. However, 3D printing this polymer introduces a major challenge. Because PPS is more difficult to extrude than polyamide, the filling factor in this study was set to 70 wt. %, which is lower than when used in injection moulding (close to 90 wt. %). The filament with a diameter of 2.75 mm was printed into a disk-shaped magnet with a diameter of 10 mm and a height of 4 mm using a HAGE 3D printer that uses a belt system for the filament extrusion. The magnets were printed onto a glass surface and onto a bulk Nd-Fe-B permanent magnet with an external magnetic field, parallel to the printer’s z-axis. Printing in the presence of a magnetic field was found to increase the magnet’s remanent magnetization by 61%, compared to an isotropic print. Without an external magnetic field we achieved a remanence of 23.9 emu/g for the 70 wt.% filling fraction, while when printing in a magnetic field, the value of the remanence improved to 39.7 emu/g because of the improved magnetic texture.

Author

Benjamin Podmiljšak

Jozef Stefan Institute

Spomenka Kobe

Jozef Stefan Institute

Tomaž Tomše

Jozef Stefan Institute

Marko Bek

University of Ljubljana

Tomaž Kotnik

National Institute of Chemistry

Lidija Slemenik Perse

University of Ljubljana

Ema Žagar

National Institute of Chemistry

Boris Saje

Kolektor Group

Kristina Žužek

Jozef Stefan Institute

Sašo Šturm

Jozef Stefan Institute

Journal of Magnetism and Magnetic Materials

0304-8853 (ISSN)

Vol. 586 171165

Subject Categories

Materials Engineering

DOI

10.1016/j.jmmm.2023.171165

More information

Latest update

4/10/2024