Nd_2Fe_(14)B/Fe_3B基纳米复合磁体的热磁行为  

Thermomagnetic Behaviors of Nd_2Fe_(14 )B/Fe_3B based Nanocomposite Magnets

作　　者：高有辉[1] 祝景汉[1] 杨忠轸 EonByung Park 

机构地区：[1]钢铁研究总院北京100081 [2]韩国工业科学技术研究院电磁材料室浦项韩国

出　　处：《金属功能材料》2001年第4期21-25,共5页Metallic Functional Materials

摘　　要：研究了快淬方法制备的Nd4 Fe80 B16和Nd4 Fe76Co3 Hf0 5Ga0 5二种合金的磁性和热行为。发现添加Hf和Ga能有效地降低Nd2 Fe14 B/Fe3 B复合磁体的晶化速度。矫顽力 (iHc)随后时效处理的不同仅有轻微的变化 ,这表明iHc 对晶粒尺度和交换耦合是磁不敏感参量。实验所观察的Mr 和Hc 随晶粒的增大变化不大 ,这与在临界晶粒尺寸 (dc)附近所做的数字计算理论不一致。本文对在各向同性纳米复合材料中的剩磁和矫顽力与晶粒尺寸的关系进行了分析。Two different compositions of melt spun magnetic alloys,Nd 4Fe 80 B 16 and Nd 4Fe 76 Co 3Hf 0 5 Ga 0 5 were studied in terms of magnetic properties and thermal behaviors. It was found that the addition of Hf and Ga effectively slow down the crystallization rate of the nanocomposite Nd 2Fe 14 B/Fe 3B magnet Coercivity( i H c) changes only slightly upon varying the post annealing conditions confirming that i H c is not a sensitive magnetic quantity as a function of grain size and exchange coupled interaction The experimentally observed behaviors of M r and H c do not vary monotonically with increasing grain size which is not in agreement with the numerically calculated result near the critical grain size(d c) The plot of the grain size dependence for the remanence and coercivity in isotropic nanocomposite magnets has been revised in this study The maximum energy product,(BH) max =15 34MGOe,and a reduced remanence,M r /M s=0 84 were obtained,respectively

关 键 词：纳米晶材料 纳米复合 交换耦合 热磁行为 永磁材料 

分 类 号：TM271.3[一般工业技术—材料科学与工程] TB383[电气工程—电工理论与新技术]