Presentation Information
[P1-4]Coercivity Enhancement and Synergistic Suppression of CeFe2 Phase in Ce Magnets with High Ce Content
*Minggang Zhu1,2, Xiaolong Song2, Qisong Sun2, Yikun Fang2, Wei Li2 (1. AT&M North Technology Co.,Ltd (China), 2. Central Iron and Steel Research Institute (China))
Keywords:
Ce magnet,Coercivity,High Ce Content,CeFe2
Earlier, we developed dual-main-phase sintered Ce magnet successfully, which solved the problem of the application of Ce element in magnets to a large extent. Nowadays, Ce magnets have already formed an industry in China, standing firmly within the permanent magnet sector, and have consistently been a hot pursuit among researchers. Our recent studies have successfully developed quasi-trivalent Ce magnets free from CeFe2 through valence state regulation of Ce. However, the traditional cerium magnets produced in factories still suffer from the presence of the CeFe2 phase, which deteriorates the magnetic properties. To expand the application areas of Ce magnets with high Ce content, it is crucial to improve their performance and to mitigate of CeFe2 phase. In this work, we propose a strategy for the efficient utilization of heavy rare earth Tb to enhance the coercivity while synergistic suppressing of CeFe2 phase in Ce magnets with high Ce-content. The design of diffusion-source alloy compositions is based on first-principles calculations, where diffusion behavior of Tb elements in Ce magnets with high Ce content is improved by the mechanism of synergistic action of Pr elements. The synergistic diffusion of Pr and Tb elements in the experiment contributes to the improvement of coercivity and suppress the CeFe2 phase in the Ce magnet. The microstructure, phase composition, magnetization reversal, and magnetic domain evolution processes reveal the mechanism of performance enhancement. The strategy of efficient coercivity enhancement and suppression of the CeFe2 phase will provide new support for expanding the application areas of Ce magnets with high Ce content.
