摘要
为了开发具有商业价值的高Ce含量RE-Fe-B磁体,提高高丰度稀土Ce的利用率,对不同Ce替代量RE-Fe-B磁体的磁性能和微观结构进行了研究。实验结果表明,Ce/(Ce+Nd)质量分数达到40%的双主相磁体仍保持着优良的磁性能,剩磁Br达到1.31 T,最大磁能积(BH)_(max)达到310.56 kJ/m^(3)。在Ce替代量为40%的单、双主相磁体中,Nd和Ce元素的置换行为存在差异,单、双主相磁体中Nd元素均偏向于进入主相晶粒,Ce元素则趋于聚集在晶界相或主相晶粒表层,且在双主相磁体中形成贫Ce主相和接近名义成分的(Nd_(0.6)Ce_(0.4))_(30.5)(Fe,M)_(bal)B_(0.97)主相。通过观察磁畴翻转分析了单、双主相磁体的磁化行为,研究了双主相磁体矫顽力增强机制:贫Ce主相的高各向异性场对富Ce主相的磁矩起到了钉扎作用。Nd和Ce元素扩散行为的研究为制备高Ce含量、高磁性能的商业化RE-Fe-B磁体提供了依据。
To develop commercially valuable RE-Fe-B magnets with high Ce content and improve the utilization of high abundance rare earth Ce,the magnetic properties and microstructure of RE-Fe-B magnets with different substitution amounts of Ce were investigated.The experimental results show that the dual main phase magnet with a Ce/(Ce+Nd)mass fraction of 40%still maintains excellent magnetic properties,with a remanence B_(r)reaching 1.31 T,and a maximum energy product(BH)_(max)reaching 310.56 kJ/m^(3).In single and dual main phase magnets with a Ce substitution of 40%,differences appear in the displacement beha-vior of Nd and Ce elements.In single and dual main phase magnets,Nd element tends to enter the main phase grains,while Ce element tends to aggregate in the grain boundary phase or the surface layers of the main phase grains.In addition,the Ce-poor main phase and(Nd_(0.6)Ce_(0.4))_(30.5)(Fe,M)_(bal)B_(0.97)main phase close to the nominal component are formed in the dual main phase magnet.The magnetization behavior of single and dual main phase magnets was analyzed by observing magnetic domain switching,and the enhancement mechanism of coercivity in the dual main phase magnets was studied.The high anisotropy field of the Ce-poor main phase imposes the pinning effect on the magnetic moment of the Ce-rich main phase.The study of the diffusion behavior of Nd and Ce elements provides a basis for the preparation of commercial RE-Fe-B magnets with high Ce content and superior magnetic properties.
作者
李志
刘飞
LI Zhi;LIU Fei(School of Science,Inner Mongolia University of Science&Technology,Baotou 014010,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2024年第1期38-43,共6页
Rare Metals and Cemented Carbides
