纳米晶复合Nd_(9.5)Fe_(76)Co_5Zr_(3-x)Nb_xB_(6.5)(x=0～3.0)粘结磁体的磁性能和温度系数的研究  

Study on the magnetic properties and temperature coefficients of nanocomposite Nd_(9.5)Fe_(76)Co_5Zr_(3-x)Nb_xB_(6.5)(x=0-3.0) magnets

作　　者：杨丽萍[1] 谭晓华[1] 徐晖[1] 徐兴国[1] 

机构地区：[1]上海大学微结构重点实验室,上海200072

出　　处：《功能材料》2012年第9期1102-1105,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51091099;51171101)

摘　　要：采用熔体快淬法及真空退火工艺制备了Nd9.5Fe76Co5Zr3-xNbxB6.5(x=0～3.0)粘结磁体,研究了其磁性能及温度系数。结果表明,随着Nb含量的增加,合金剩磁逐渐提高,磁能积和矫顽力呈现先增大后减小的趋势。Zr元素与Nb元素复合添加,能够有效地改善矫顽力温度系数β。经最佳条件退火处理后制备的Nd9.5Fe76Co5Zr1.5Nb1.5B6.5的粘结磁体,具有最优的综合磁性能:Br=0.717T,Hcj=773kA/m,(BH)max=82kJ/m3,α20～150℃=-0.111%/℃,β20～150℃=-0.356%/℃。Nanocomposite Nd_（9.5）Fe_（76）Co_5Zr_（3-x）Nb_xB_（6.5）（x=0～3.0） bonded magnets were prepared by melt-spun and vacuum annealing processes. The magnetic properties and temperature coefficients of the magnets were investi- gated. It could be found that the intrinsic coercivity and maximum energy product increased first, then de- creased, while the remanence increased with the increase of Nb addition for the Nd_（9.5）Fe_（76）Co_5Zr_（3-x）Nb_xB_（6.5）（x=0～3.0）magnets. The addition of Zr and Nb could improve obviously the temperature coefficient of coercivity. The optimal magnetic properties of bonded magnets were obtained for the nanocomposite Nd9.5Fe76 Co5 Zr1. 5 Nb1. 5 B6.5 magnet, that is Br = 0. 717T, Hcj = 773kA/m, （BH）max = 82kJ/ma, ae20-150℃ = - 0. 111%/℃, β20-150℃ = -0. 356 %//℃.

关 键 词：纳米晶复合永磁材料 磁性能 温度系数 交换耦合作用 

分 类 号：TM273[一般工业技术—材料科学与工程]