速凝铸造工艺制造高性能烧结Nd-Fe-B磁体  

Sintered Nd-Fe-B Magnet Produced by the Strip Casting Technology

作　　者：裴文利[1] 连法增[1] 周桂琴[1] 付猛[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2003年第1期64-67,共4页Journal of Northeastern University(Natural Science)

基　　金：国家'十五'重点攻关项目(2002BA315A 6 5).

摘　　要：研究了用速凝铸造工艺制造高性能烧结Nd Fe B磁体·同传统的铸锭工艺相比,速凝铸造工艺细化柱状晶,阻止α Fe枝晶相的产生,改善了铸态合金的微观结构·柱状晶宽度基本在5～25μm之间,尺寸较均匀;在制粉过程中容易得到粒度分布较好的磁粉;富Nd相分布较好,所以在较低烧结温度下可得到较高密度的磁体;由于具有细小均匀的微结构,利用速凝铸带工艺烧结出的磁体具有更高的Br,Hci和(BH)max·High performance NdFeB magnet produced by the strip casting (SC) was investigated. Compared with traditional ingot casting technology, the SC processing refines and homogenizes the columnar structures and suppresses the formation of αFe dendrites so that greatly improves the microstructure in the ascasted alloy. It was found that the Ndrich phase distributes uniformly along the grain boundaries of fine columnar matrix phase in the speed cooled strip. The columnar grains are about 5～25?μm in mean width. Using the cast strips for powder production, the fine powder with a good particle size distribution can be obtained easily. Due to the optimum distribution of Ndrich phase, the magnets made from the cast strip shows high density even at a lower sintering temperature. The magnets made by SC technology showed a higher Br,Hci and (BH)max than that made by traditional ingot technology.

关 键 词：高性能烧结Nd-Fe-B磁体 速凝铸造工艺 晶粒尺寸 α-Fe相 粒度分布 制造工艺 磁粉 磁性能 

分 类 号：TF125.8[冶金工程—粉末冶金] TM27[冶金工程—冶金物理化学]