Fe_3B添加量对Nd-Fe-B快淬薄带结构与磁性能的影响  

The effects of additive amount of Fe_3B on the structure and magnetic properties of Nd-Fe-B melt-spun ribbons

作　　者：张冠英[1] 孙继兵[2] 

机构地区：[1]河北工业大学电气工程学院,天津300130 [2]河北工业大学材料科学与工程学院,天津300130

出　　处：《河北工业大学学报》2012年第1期53-56,共4页Journal of Hebei University of Technology

基　　金：天津市应用基础研究计划重点基金(09JCZDJC22800)

摘　　要：通过在Nd2Fe14B合金中按Fe3B原子比同时添加Fe与B,研究了Nd15Fe77B8、Nd9Fe81B10、Nd4.5Fe77.0B18.53种合金薄带的结构与磁性能.试验发现,40 m/s的快淬速度使三种合金薄带中形成了较多的非晶相,而且随着合金中Fe3B添加量的增加,薄带的非晶形成能力增强、-Fe与Fe23B6含量增加、Nd2Fe14B含量减少,磁性能单调降低.经680℃保温10 min退火处理后,3种薄带中的非晶相明显减少,Fe3B相消失,-Fe与Fe23B6含量随Fe3B添加量的增加而增加.其中,薄带中Nd2Fe14B晶粒约50~100 nm,而-Fe晶粒一般小于50 nm.Nd15Fe77B8退火薄带更多地表现为单硬磁相特征;Nd9Fe81B10退火薄带中形成了-Fe/Nd2Fe14B/Fe23B6三相交换耦合微结构,剩磁比达到了0.612,并获得最大的剩磁58.3A m2/kg;而Nd4.5Fe77.0B18.5薄带中Fe23B6与-Fe含量太高,矫顽力太低而使剩磁增强效应不明显.Fe and B were added into the Nd2Fe14B matrix alloy simultaneously according to the atomic ratio of Fe3B.The structure and magnetic properties of Nd15Fe77B8,Nd9Fe81B10 and Nd4.5Fe77.0B18.5 ribbons were investigated.It was found that the melt-spinning speed of 40 m/s induced formation of high content of amorphous phase in the three types of ribbons.With increasing the additive amount of Fe3B in the parent alloys,the glass-forming ability of ribbons was enhanced and the content of-Fe and Fe23B6 was increased and the content of Nd2Fe14B was decreased,which results in decreasing monotonously the magnetic properties.After the ribbons were annealed at 680 ℃ for 10 min,the content of amorphous phase decreased obviously and the Fe3B phase was disappear.However,the content of-Fe and Fe23B6 was increased with increasing the additive amount of Fe3B in the parent alloys.Moreover,the grain size of Nd2Fe14B phase is among the range of 50 ~ 100 nm and the grain size of-Fe is normally less than 50 nm.The magnetic behavior of annealed Nd15Fe77B8 ribbons mainly behaved the characteristics of a single hard magnetic phase.A special three-phase exchange coupling microstructure of-Fe/Nd2Fe14B/Fe23B6 was formed and the maximum remanence ratio of 0.612 and maximum remanence of 58.3 Am2/kg were obtained in the annealed Nd9Fe81B10 ribbons.In the annealed Nd4.5Fe77.0B18.5 ribbons,however,the remanence enhancement effect was unobvious due to their low coercivity and high content of Fe23B6 and-Fe.

关 键 词：磁性材料 熔体快淬 交换耦合 结构 磁性能 

分 类 号：TM274[一般工业技术—材料科学与工程]