Additive-manufactured anisotropic magnets for harsh environments

Podmiljšak, Benjamin (author), Kobe, Spomenka (author), Tomše, Tomaž (author), Bek, Marko (author), Kotnik, Tomaž (author), Slemenik Perše, Lidija (author), Žagar, Ema (author), Saje, Boris (author), Žužek Rožman, Kristina (author), Šturm, Sašo (author)

We describe the fabrication of SrFe$_{12}$O$_{19}$-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.

• Language: English
• Keywords: SrFe$_{12}$O$_{19}$-based filaments, magnetic particles, polymers, polyphenylene sulphide, 3D printing, magnetic field
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 9 str.
• Numbering: Vol. 586, art. 171165
• PID: 20.500.12556/RUL-153050
• UDC: 537
• ISSN on article: 0304-8853
• DOI: 10.1016/j.jmmm.2023.171165
• COBISS.SI-ID: 162298115
• Publication date in RUL: 15.12.2023

Record is a part of a journal

• Title: Journal of magnetism and magnetic materials
• Shortened title: J. magn. magn. mater.
• Publisher: Elsevier
• ISSN: 0304-8853
• COBISS.SI-ID: 25758720

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: L2-1829
• Name: Razvoj večkomponentnih trajnih magnetov kompleksnih oblik z uporabo napredne tehnologije 3D tiskanja

• Funder: Other - Other funder or multiple funders
• Funding programme: Kolektor d.o.o.