Schäfer, Kilian (2024)
Laser powder bed fusion of hard magnetic composites.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00027587
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Laser powder bed fusion of hard magnetic composites | ||||
Language: | English | ||||
Referees: | Gutfleisch, Prof. Dr. Oliver ; Kupnik, Prof. Dr. Mario | ||||
Date: | 24 July 2024 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | 157 Seiten in verschiedenen Zählungen | ||||
Date of oral examination: | 11 June 2024 | ||||
DOI: | 10.26083/tuprints-00027587 | ||||
Abstract: | Hard magnetic materials are crucial in advancing human welfare by supporting carbon-neutral technologies and medical devices. While existing manufacturing techniques are well adapted to producing large, simple-shaped magnets, there is a growing need for a more resource-efficient process to produce intricate small magnetic components. Additive manufacturing emerges as a promising solution capable of fabricating hard magnetic components with complex shapes that generate magnetic stray fields tailored for particular applications, in a resource-efficient manner. The adaptability of additive manufacturing technologies to create anisotropic and locally adjusted material properties holds significant potential for magnetic materials. This work investigates composites formed through laser powder bed fusion, combining hard magnetic powders with polyamide-based polymers and flexible thermoplastic polyurethanes. The influence of the magnetic powder filler fraction, morphology and particle size on the resulting magnetic performance is evaluated. It is demonstrated that anisotropic magnetic properties, which are an important step to increase magnetic performance, can be achieved if elongated powder particles with a relation between crystallography and particle morphology are used. Moreover, the research demonstrates the achievement of localized mechanical properties in hard magnetic composites by utilizing distinct laser processing parameters in different regions during the laser powder bed fusion process. This localised control makes it possible to produce magnetically controllable actuators whose properties can be precisely adapted for applications. The energy efficiency of magnetic actuation can be improved and flexible and adjustable requirements for component geometry and local stiffness, which are needed in biomedical applications, can be met. The findings of this work offer a guideline for tailoring the performance of hard magnetic composites using laser powder bed fusion. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-275875 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Functional Materials |
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Date Deposited: | 24 Jul 2024 12:26 | ||||
Last Modified: | 26 Jul 2024 09:45 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/27587 | ||||
PPN: | 520118219 | ||||
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