添加Dy在快淬NdFeB永磁体中的作用  

Role of Dy addition in rapid-quenched NdFeB permanent magnets

作　　者：张然[1] 刘颖[1] 高升吉[1] 谢治[2] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610064 [2]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《物理学报》2008年第1期526-530,共5页Acta Physica Sinica

基　　金：国家高技术研究发展(863)计划项目(批准号:2004AA32G084);教育部新世纪优秀人才计划项目(批准号:NCET-04-0873);四川省重大科技攻关项目(批准号:03GG009-006);四川省杰出青年科技基金(批准号:03ZQ026-006)资助的课题~~

摘　　要：在之前研究Nb元素的添加对快淬(Nd,Dy)11.5Fe82.4-mNbmB6.1永磁体磁性能、温度特性及显微组织影响的基础上,进一步研究了Dy元素在Nd11.5-nDynFe81.4Nb1B6.1(n=0,0.5,1,1.5,2)永磁体中的作用.结果表明:少量Dy元素的添加可以在不显著影响剩磁(Br)的情况下较大幅度提高磁体的内禀矫顽力(Hci),降低磁通不可逆损失(hirr).Dy在NdFeB磁体中的作用是使晶粒细小化、均匀化、规则化,提高交换耦合钉扎场(Hp),减小材料内部的散磁场,显著降低磁通不可逆损失,改善NdFeB磁体在高温下的使用性能.Dy原子进入了主相晶体结构,造成晶格畸变,使得Fe原子配位峰形状发生变化,同时对Nd原子局域结构也会产生一定影响.Following the previous study on the effect of Nb addition in rapid-quenched （Nd,Dy）11.5Fe82.4-mNhmB6.1 permanent magnets on the magnetic properties, temperature characteristics and microstructure, the role of Dy addition in rapid-quenched Nd11.5-nDynFe81.4Nb1B6.1（n=0,0.5,1,1.5,2） permanent magnets has been investigated. It was found that Hci increases with increasing Dy content and the irreversible loss of magnetic flux decreases. Dy addition results in smaller grains and more homogeneous and regular grain structure. It is considered that Dy addition may enhance exchange coupling pining field and reduce the internal stray magnetic field. As a result, the irreversible loss of magnetic flux decreases notably and the magnetic properties at higher temperature are improved. Dy atoms on entering the main lattice of Nd11.5-nDynFe81.4Nb1B6.1 alloy cause crystal lattice distorsion and affect the local structure of Fe atoms; however, Dy atoms have little influence of the local structure of Nd atoms.

关 键 词：NDFEB 磁性能 温度特性 显微组织 X RAY absorption FINE structure 

分 类 号：TM273[一般工业技术—材料科学与工程]