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Designing the microstructure of 3D printed Nd-Fe-B bonded magnets : doctoral dissertation = Načrtovanje mikrostrukture 3D printanih plastomagnetov Nd-Fe-B : doktorska disertacija
Hajra, Granit
This doctoral dissertation investigates the development of 3D printed polymer bonded magnets using a TPU-PA12 matrix bonded with Nd-Fe-B particles, aiming to achieve enhanced mechanical and magnetic ...properties for industrial applications. In the first phase, two composite formulations were examined: one containing atomized spherical powder (ASP) and the other incorporating melt-spun flakes (MSF). These particles were mixed with the TPU-PA12 matrix and then processed into filaments for 3D printing. Microstructural and performance analyses revealed that MSF offered better magnetic performance, while ASP exhibited higher porosity due to its internal structure. To overcome the limitations of single-particle systems, the second phase introduced a hybrid formulation combining both ASP and MSF particles. The hybrid approach improved particle distribution and interfacial adhesion and reduced porosity, resulting in better overall mechanical and magnetic behavior. Additionally, the influence of key 3D printing parameters—such as nozzle temperature, bed temperature, feed rate, and layer thickness—was systematically studied to optimize structural integrity and performance. This study offers valuable insights into the synergistic interaction between particle morphology, polymer matrix compatibility, and processing parameters. It provides a promising pathway for designing high-performance magnetic composites tailored for automotive, electronics, and renewable energy applications, thus contributing to advancements in additive manufacturing of functional polymer-bonded magnets.
Type of material - dissertation
; adult, serious
Publication and manufacture - Maribor : [G. Hajra], 2025
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