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 NdFeB 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 αFe dendrites so that greatly improves the microstructure in the ascasted alloy. It was found that the Ndrich 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 Ndrich 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.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
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).