Effect of ball milling process on coercivity of nanocrystalline SmCo5 magnets
Effect of ball milling process on coercivity of nanocrystalline SmCo5 magnets
复制标题
球磨工艺对纳米晶SmCo5磁体矫顽力的影响
DOI：
10.1016/j.jmmm.2017.09.012
复制
发表时间：
2018
影响因子：
2.7
通讯作者：
Zhang TL
中科院分区：
文献类型：
--
作者：
Fang Lei;Zhang Tianli;Wang Hui;Jiang Chengbao;Liu Jinghua;Zhang TL
本文系统研究了球磨工艺对纳米晶SmCo 5永磁体剩磁和矫顽力的影响。采用高能球磨和放电等离子烧结法制备了SmCo 5纳米晶磁体。并对它们的剩磁和矫顽力的巨大差异进行了深入的分析。采用表面活性剂油胺（OY）湿磨法制备的各向异性SmCo 5磁体具有较高的剩磁，但矫顽力远低于干磨法制备的各向同性磁体。进一步的分析表明，铣削过程引起的晶粒尺寸和形状的变化是影响晶粒度的关键因素。干磨法制备的非晶粉末在烧结过程中晶化，磁体晶粒细小均匀;湿磨法制备的各向异性纳米片具有良好的取向性，但由于晶粒较大且不均匀，磁体的矫顽力较低。
In this paper, the effect of ball milling process on remanence and coercivity of nanocrystalline SmCo5magnets was systematically investigated. Nanocrystalline SmCo5magnets were prepared by high energy ball milling and spark plasma sintering. And their vast difference of remanence and coercivity were analyzed thoroughly. The anisotropic SmCo5magnets prepared by wet-milling with surfactant (oleylamine, OY) have high remanence, but the coercivity is much lower than the isotropic magnets prepared by dry-milling. Further analysis indicates the milling process induced changes on the size and shape of grains are the key factors influencing the coercivity. The amorphous powders prepared by dry-milling were crystallized during sintering and the magnets have small and homogeneous grains, while the anisotropic nanoflakes prepared by wet-milling could be well oriented but the magnets have lower coercivity due to the larger and inhomogeneous grains.