Maccari, Fernando (2022)
Investigations on ThMn12-type and Mn-Al compounds as permanent magnet candidates.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00021140
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
Permanent magnets (PM) are key components on the emerging and growing technologies related to renewable energies and electromobility, besides the vast use in data storage, sensors, robotics and automatization and many other consumer technologies. The combination of this scenario highlights the observed increase in the high-performance magnets demand that will grow in the following years. However, even though these key components are considered the main solution of such developments, they are also in the center of concerns and uncertainty. The rare earth (RE) elements used to obtain the high magnetic properties are very sensitive to market and price fluctuations, besides the risks regarding supply because of geopolitical or sustainable development issues. In this context, finding suitable compounds that show promising magnetic properties, while overcoming these issues, is of a great importance. In this dissertation, two types of prospective materials for permanent magnetic applications were investigated: the RE-lean ThMn12-type and the RE-free Mn-Al compounds. A correlation between microstructure and extrinsic magnetic properties was investigated to understand the discrepancy in relation to the intrinsic properties. With this aim, multi scale characterization techniques, allied with different types of simulations, were used to give a better understanding of the overall aspects of phase formation, phase stability and to build the knowledge on the relation structure-processing-microstructure-magnetic properties. Through this evaluation and identification of microstructural weak links, insights about the coercivity mechanism could be drawn, which can be used to further create strategies to develop the permanent magnet candidates investigated in this work. The unfolding of such study is important to improve and create alternative magnets that can possibly reduce the dependency on critical raw materials, enabling possibilities for a more sustainable development of different technologies and applications.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2022 | ||||
Autor(en): | Maccari, Fernando | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Investigations on ThMn12-type and Mn-Al compounds as permanent magnet candidates | ||||
Sprache: | Englisch | ||||
Referenten: | Gutfleisch, Prof. Dr. Oliver ; Durst, Prof. Dr. Karsten | ||||
Publikationsjahr: | 2022 | ||||
Ort: | Darmstadt | ||||
Kollation: | xxiii, 146 Seiten | ||||
Datum der mündlichen Prüfung: | 11 März 2022 | ||||
DOI: | 10.26083/tuprints-00021140 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/21140 | ||||
Kurzbeschreibung (Abstract): | Permanent magnets (PM) are key components on the emerging and growing technologies related to renewable energies and electromobility, besides the vast use in data storage, sensors, robotics and automatization and many other consumer technologies. The combination of this scenario highlights the observed increase in the high-performance magnets demand that will grow in the following years. However, even though these key components are considered the main solution of such developments, they are also in the center of concerns and uncertainty. The rare earth (RE) elements used to obtain the high magnetic properties are very sensitive to market and price fluctuations, besides the risks regarding supply because of geopolitical or sustainable development issues. In this context, finding suitable compounds that show promising magnetic properties, while overcoming these issues, is of a great importance. In this dissertation, two types of prospective materials for permanent magnetic applications were investigated: the RE-lean ThMn12-type and the RE-free Mn-Al compounds. A correlation between microstructure and extrinsic magnetic properties was investigated to understand the discrepancy in relation to the intrinsic properties. With this aim, multi scale characterization techniques, allied with different types of simulations, were used to give a better understanding of the overall aspects of phase formation, phase stability and to build the knowledge on the relation structure-processing-microstructure-magnetic properties. Through this evaluation and identification of microstructural weak links, insights about the coercivity mechanism could be drawn, which can be used to further create strategies to develop the permanent magnet candidates investigated in this work. The unfolding of such study is important to improve and create alternative magnets that can possibly reduce the dependency on critical raw materials, enabling possibilities for a more sustainable development of different technologies and applications. |
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Alternatives oder übersetztes Abstract: |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-211407 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
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Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
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Hinterlegungsdatum: | 19 Apr 2022 13:41 | ||||
Letzte Änderung: | 08 Aug 2022 07:48 | ||||
PPN: | 494282681 | ||||
Referenten: | Gutfleisch, Prof. Dr. Oliver ; Durst, Prof. Dr. Karsten | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 11 März 2022 | ||||
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