La取代对烧结NdFeB磁体微观结构和性能的影响  

Effects of La substitution on the microstructures and properties of sintered NdFeB magnets

作　　者：周晓庆 刘盛业 吕向科 张民 丁勇 

机构地区：[1]宁波韵升高科磁业有限公司,浙江宁波315040

出　　处：《磁性材料及器件》2013年第6期17-20,69,共5页Journal of Magnetic Materials and Devices

基　　金：国家863计划资助项目(2011AA03A401)

摘　　要：采用片铸工艺和粉末冶金工艺制备烧结（Nd,Pr）29.9-x Lax（Fe,TM）bal B0.98（x=0,1,2,4,6）磁体,研究了La取代量对磁体微观结构、磁性能和力学性能的影响。结果表明,La主要进入晶界富稀土（RE）相中,由于氧的富集程度不同,形成了两种不同形态和分布的含La富RE相;与不含La的烧结NdFeB磁体相比,La取代量为1~2wt%的磁体具有良好的综合性能,其晶粒尺寸均匀细小;当La的取代量增加到4wt%以上时,磁体显微组织很不均匀,其密度、磁性能及抗弯强度显著降低。Sintered（Nd,Pr）29.9-x Lax（Fe,TM）bal B0.98（x=0,1,2,4,6） magnets were prepared by powder metallurgy process combining vacuum strip-casting, and effect of La substitution on their microstructure, magnetic properties and bending strength has been investigated. The results show that La mainly enters intergranular RE-rich phase. With different content of oxygen, the RE-rich phase containing La forms two different shapes and distribution characteristics.Compared with magnet without La, magnet with 1~2wt% La substitution for Nd has fine grain and homogeneous microstructure, and resultantly, exhibits satisfactory comprehensive properties. When x≥4 the microstructures of the magnets become nonuniform, and its density, magnetic properties and bending strength reduce significantly.

关 键 词：烧结NDFEB La取代 微观结构 磁性能 抗弯强度 

分 类 号：TM273[一般工业技术—材料科学与工程]