Preparation of High-performance Bulk Permanent Magnets by Doping Tb-Fe-B in Nd-Fe-B Magnets
In response to the demand for large equipment components in new energy,the preparation of large permanent magnet materials with high remanence and high coercivity has become the focus of current research and development.Unlike grain boundary diffusion technology(GBDP),the multi-main-phase(Nd,Tb)-Fe-B sintered magnet prepared by the dual-al-loy process(Nd-Fe-B magnet doped with Tb19Fe75B6)not only achieves high remanence and high coercivity but also has con-trollable shape,demonstrating higher practical value.Microstructure analysis confirmed that doping with Tb19Fe75B6 opti-mizeed the grain boundary of the magnet and formed a(Nd,Tb)2Fe14B shell layer on the surface of Nd2Fe14B grain,combined with the presence of Tb2Fe14B phase,the coercivity is significantly improved.The simultaneous realization of high remanence and high coercivity of multi-main-phase(Nd,Tb)-Fe-B magnets is mainly attributed to the interface coupling effect triggered by the coexistence of Tb2Fe14B single crystal and Nd2Fe14B single crystal in the microstructure.The results provide a reliable and effective way to prepare high-performance bulk permanent magnet materials.
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