Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 7: Bulk Magnetic Materials and Magnetic Particles/Clusters
MA 7.4: Talk
Monday, March 18, 2024, 10:15–10:30, EB 407
Nano-composites for high performance Nd-Fe-B permanent magnets — Lukas Schäfer1, Imants Dirba1, Fernando Maccari1, Konstantin Skokov1, Esmaeil Adabifiroozjaei2, Leopoldo Molina-Luna2, and •Oliver Gutfleisch1 — 1Functional Materials, Materials Science, TU Darmstadt, Darmstadt, Germany — 2Advanced Electron Microscopy, Materials Science, TU Darmstadt, Darmstadt, Germany
Permanent magnets (PM) based on Nd-Fe-B are important for modern electric motor and generator applications crucial to energy conversion. Especially due to the clean energy transition, which results in a higher demand for electric cars and wind turbines, the need for high performance PM is expected to drastically increase in the coming years. In order to improve the magnetic performance and, at the same time, reduce the content of critical rare earth, the design of nano-composite microstructures consisting of the hard magnetic and soft magnetic phases is a promising approach. Textured "exchange-spring magnets" could, in theory, surpass the theoretical limit of today s commercial Nd-Fe-B magnets, yet despite three decades of research, bulk, textured nanocomposites with enhanced performance have not been realized yet. In this talk, a novel top-down approach based on the formation of a metastable phase in the Nd-Fe-B system by rapid solidification is presented. Microstructural and magnetic investigations will demonstrate the unique thermal decomposition of this phase into the hard magnetic Nd2Fe14B phase and soft magnetic nano-precipitates of α-Fe, leading to an enhancement of the remanence.
Keywords: nano-composite; exchange-spring-magnet; remanence enhancement; metastabile phase; Nd-Fe-B