快淬Nd_9Fe_(85-x)Mn_xB_6(x=0、0.5、1)磁性能研究  

Reasearch on the magnetic properties of melt-spun Nd_9Fe_(85-x)Mn_xB_6(x0、0.5、1)

作　　者：谢国治[1] 田宗军[1] 余智[1] 顾本喜[1] 鹿牧[1] 都有为[1] 

机构地区：[1]南京大学物理系

出　　处：《功能材料》2002年第6期615-617,共3页Journal of Functional Materials

基　　金：国家重点基础研究项目资助 (973)项目 (G1 9990 6450 8)

摘　　要：应用DTA、XRD、M ssbauer谱和VSM对快淬Nd9Fe85-xMnxB6(x =0、0 .5、1)纳米复合材料磁性能进行了研究。发现少量Mn的掺杂能够显著促进快淬样品的晶化并提高快淬样品的永磁性能 ,在合适的热处理条件下 ,得到的最佳矫顽力和剩磁比分别从 3 3 9.5kA/m和 0 .70提高到 3 98.1kA/m和0 .72 ,最大磁能积 (BH) max从 83 .6kJ/m3 提高到 87.5kJ/m3 ,而剩磁没有明显的下降。TMA显示Mn掺杂降低Nd2 Fe14 B相的居里温度并提高α Fe相的居里温度。认为永磁性能的提高是由于Mn进入两相的晶格。The magnetic properties of Nd 9Fe 85- x Mn x B 6( x =0,0.5,1) exchange coupling magnets and influence of Manganese addition were investigated by DTA, XRD, VSM and Mssbauer spectroscopy. It was found that Manganese addition can promote crystallization and enhance both coercivity and remanence ratio. The optimum coercivity and remanence ratio increases from 339.5kA/m and 0.70 to 398.1kA/m and 0.72, ( BH ) max from 83.6kJ/m 3 to 87.5kJ/m 3, respectively. TMA shows Mn doping decreases the Curie temperature of the Nd 2Fe 14 B phase and raises that of α Fe phase. The volume fractions of α Fe and Nd 2Fe 14 B phase measured by Mssbauer spectroscopy were slightly different from Mn addition content. It was presumed that the enhancements in hard magnetic properties may be attributed to Mn enter the crystal structure of phases.

关 键 词：纳米复合材料 矫顽力 交换耦合 熔体快淬 永磁材料 

分 类 号：TM273[一般工业技术—材料科学与工程]