20.500.12556/DKUM-92949 Designing the microstructure of 3D printed Nd-Fe-B bonded magnets doctoral disertation Načrtovanje mikrostrukture 3D printanih plastomagnetov Nd-Fe-B doktorska disertacija 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. Ta doktorska disertacija raziskuje razvoj 3D-natisnjenih polimerno vezanih magnetov na osnovi TPU-PA12 matrice in Nd-Fe-B delcev z namenom doseganja izboljšanih mehanskih in magnetnih lastnosti za industrijske aplikacije. V prvi fazi sta bili analizirani dve formulaciji: ena z atomiziranim sferičnim prahom (ASP) in druga s talilno predenimi kosmiči (MSF). Oba tipa delcev sta bila integrirana v TPU-PA12 matrico, izdelani filamenti pa so bili uporabljeni za 3D-tiskanje vzorcev. Rezultati so pokazali razlike v mikrostrukturi, gostoti, koercitivnosti in upogibni trdnosti, kjer so MSF delci prispevali k boljši magnetni zmogljivosti, medtem ko je ASP pokazal večjo poroznost. V drugi fazi je bila razvita hibridna formulacija z združitvijo ASP in MSF delcev, da bi se izkoristile njune komplementarne prednosti. Analiza je pokazala izboljšano porazdelitev delcev, večjo vezavno moč in zmanjšano poroznost, kar se je odražalo v izboljšanih mehanskih in magnetnih lastnostih. Poleg tega je bil podrobno preučen vpliv parametrov 3D-tiskanja na končne lastnosti vzorcev. Disertacija prispeva k poglobljenemu razumevanju sinergij med morfologijo delcev, matrico in obdelovalnimi parametri ter ponuja obetavne smernice za načrtovanje visokozmogljivih magnetnih kompozitov za uporabo v avtomobilski industriji, elektroniki in obnovljivih virih energije. magneti vezani s polimeri hibridni magneti Nd-Fe-B matrica TPU-PA12 taljeno predeni kosmiči (MSF) atomiziran sferični prah (ASP) napredna proizvodnja vezanih magnetov aditivna proizvodnja (3D-tiskanje) optimizacija procesnih parametrov zasnova mikrostrukture magnetne in mehanske lastnosti polymer bonded magnets Nd-Fe-B hybrid magnets TPU-PA12 matrix Melt-Spun Flakes (MSF) Atomized Spherical Powder (ASP) advanced manufacturing of bonded magnets additive manufacturing (3D printing) process parameter optimization microstructure design magnetic and mechanical properties. true true false [G. Hajra] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2025-05-28 10:39:04 2025-11-25 12:53:13 2025-12-05 03:07:08 0000-00-00 00:00:00 2025 0 Maribor 0 Maribor XVI, 129 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 [004.942+519.6]:66.132-77(043.3) 260057859 DOK_Hajra_Granit_2025.pdf DOK_Hajra_Granit_2025.pdf 1 FB7A379B65640B489A5196B25E5C5C6C 1f7ba50269f9f3c16bff5c98933eb524b5515bd9c553b17219e51207037df707 9efc2b74-c9e4-11f0-8fc7-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=200878 Fakulteta za strojništvo 0 0 0