SmFeN稀土永磁材料的研究进展

Research Progress of SmFeN Rare-Earth Permanent Magnet

SmFeN永磁材料具有高矫顽力、高饱和磁化强度及高居里温度,在航空航天、电动汽车、风力发电及人工智能等新兴领域具有重要的应用价值,再次受到科研人员的重视。本文介绍了SmFeN磁体的晶体结构和氮化机理,综述了采用熔体快淬法、机械合金化、还原扩散法及氢化歧化法后续氮化处理制备SmFeN磁粉的研究进展。此外,重点介绍了块体SmFeN磁体制备的研究进展以及合金元素对SmFeN磁体磁性能的影响。基于目前的研究进展,阐明了SmFeN永磁材料所面临的关键科学问题,并对SmFeN磁体的发展前景做出了展望。

SmFeN rare-earth permanent magnet is a good candidate for high-performance magnets because of their high saturation magnetization and large uniaxial anisotropy. It has important application values in emerging fields such as aerospace, electric vehicles, wind power and artificial intelligence. In this review, the crystal structure and nitrogen mechanism of SmFeN permanent magnet were summarized. Preparation of SmFeN magnetic powders by melt rapid quenching, mechanical alloying, reduction diffusion and hydrogenation disproportionation desorptionre combination followed by nitride treatment were summarized. The preparation research progress of bulk SmFeN permanent magnet and effects of alloying elements on the magnetic properties of SmFeN permanent magnets were reviewed. The confronting problems to prepare high-performance SmFeN permanent magnets were shown, and future development trend was described.