SKM 2023 – wissenschaftliches Programm

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SYGM: Symposium Green Magnets for Efficient Energy Conversion

SYGM 1: Green Magnets for Efficient Energy Conversion

SYGM 1.2: Hauptvortrag

Montag, 27. März 2023, 15:30–16:00, HSZ 01

High performance permanent magnets; elements criticality, new demands, and extrinsic magnetic properties — •Hossein Sepehri-Amin, Xin Tang, Tadakatsu Ohkubo, and Kazuhiro Hono — National Institute for Materials Science, Tsukuba, Japan

Permanent magnets are widely used in the green energy conversions and they play an important role toward realization of carbon neutrality. In order to maintain sustainable production of permanent magnets in a long term, efforts are required to eliminate the permanent magnets* reliance on critical elements such as Dy and to diverge rare-earth usage while maintaining sufficiently large coercivity and energy product in the magnets. we will first present our research efforts on development of high coercivity Dy-free Nd-Fe-B magnets for applications in traction motor of hybrid/electric vehicles and generator of wind turbines. We will demonstrate how grain boundary/interface engineering in the hot-deformed Nd-Fe-B magnets has led to a large coercivity of 2.5 T, remanent magnetization of 1.32 T and excellent thermal stability of coercivity. In the second part of the talk, the potential of Fe-rich SmFe12-based magnets and the current challenges to realize these materials as new permanent magnets will be discussed. we will show our recent success in realizing a sufficiently large coercivity of 1.0 T in rare-earth lean SmFe12-based anisotropic sintered magnets assisted by machine learning. Based on detailed microstructure characterizations, modeled thin films, and micromagnetic simulations, we will discuss the optimum microstructure which can lead to a larger coercivity and remanent magnetization in the SmFe12-based magnets.