添加Zr的(Nd,Pr)_(10.5)Fe_(81.5-x)Zr_xCo_2B_6合金显微结构与磁性能  

Microstructure and Magnetic Properties of Rapid Quenching (Nd,Pr)_(10.5)Fe_(81.5-x)Zr_xCo_2B_6 Alloys by Zr Substitution

作　　者：查五生[1] 刘颖[1] 高升吉[1] 涂铭旌[1] 

机构地区：[1]四川大学

出　　处：《稀有金属材料与工程》2005年第5期717-720,共4页Rare Metal Materials and Engineering

基　　金：国家"863"计划资助项目(2001AA324030)

摘　　要：研究了添加Zr元素对快淬(Nd，Pr)10．5Fe81．5-xZrxCo286=0，0．5，1．0，1．5，2．0，2．5)合金显微组织结构和磁性能的影响，用AFM观察了合金条带自由表面的显微结构。结果表明：添加Zr元素能显著细化合金的晶粒，从(Nd，Pr)10.5Fe81.5Co2B6合金的～150nm减小到(Nd，Pr)10.5Fe80Zr1.5Co2B6合金的～50nm：1％是Zr最佳添加量，低于1％晶粒不够细化，合金的各项磁性能指标均很低，超过1％，富集在晶界处的富Zr晶间相加厚，晶粒间的交换作用和剩磁增强效应减弱，磁体的剩磁研和最大磁能积(BH)m降低。(Nd，Pr)10.5Fe80.5Zr1Co2B6粘结磁体磁性能最佳：Br=0．675T，Hci=616kA·m^-1，(BH)m=77kJ·m^-3。The effects of substitution of Fe by Zr on the microstructure and magnetic properties of (Nd,Pr)10.5Fe81.5- ZrxCo2B6 alloys x which were prepared by overquenching and post annealing method were investigated. The free surface microstructures of crystallized ribbons were observed by means of atom force microscopy (AFM). The addition of Zr dopant will significantly reduce the average grain size of ribbons, from ~150 nm of Zr-free (Nd,Pr)10.5Fe81.5Co2B6 alloy to ~60 nm of (Nd,Pr)10.5Fe80.5Zr1Co2B6 and ~50 nm of (Nd,Pr)10.5Fe80Zr1.5Co2B6. But the changes of alloy magnetic properties are not similar to that of grain size. The value of 1at% of Zr substitution is optimal. The binded magnets (with 3.25wt% epoxy) of (Nd,Pr)10.5Fe80.5Zr1Co2B6 has the best combination of properties, i.e. Br=0.675 T, Hci=616 kA·m-1, (BH)max=77 kJ·m-3, and Hk/Hci=39.9%. Below 1at%, the coarser grains result in a lower magnetic property. On the other hand, exceed addition of Zr (above 1at%) will lead the layer of Zr-rich intergranular phase to thicken, which courses the coupling exchange of adjacent grains to weaken, and the magnetic properties of alloy to degrade.

关 键 词：纳米复合永磁材料 Zr元素 快淬 显微结构 磁性能 

分 类 号：TG139[一般工业技术—材料科学与工程]