回火处理对烧结钕铁硼永磁材料组织和磁性能的影响  

Effect of tempering on microstructure and magnetic properties of sintered Nd-Fe-B magnets

作　　者：谭春林[1] 白书欣[2] 张虹[2] 高艳丽[2] 张家春[2] 蔡珣[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]国防科技大学航天与材料工程学院,长沙410073

出　　处：《中国有色金属学报》2002年第z1期64-66,共3页The Chinese Journal of Nonferrous Metals

基　　金：湖南省自然科学基金资助项目 ( 0 0JJY2 0 42 )

摘　　要：探讨了回火处理对烧结Nd Fe B系合金显微组织和磁性能的影响。研究表明 :回火处理后 ,磁体的显微组织得到明显的改善 ,主相体积分数增加 ,晶界变得清晰 ,晶粒尺寸趋向均匀 ;颗粒状富Nd相减少 ,富Nd相沿晶界均匀分布 ,成分趋于共晶富Nd相的成分 ;磁体的剩磁、矫顽力和最大磁能积都得到提高 ,最大磁能积普遍提高 2 0～ 30kJ/m3。The effect of tempering process on the microstructure and magnetic properties of sintered Nd Fe B magnets were studied. It is showed that, after tempering, the microstructure of magnets is improved. An increase in the volume fraction of matrix phase was observed. The grain boundary gets clearer and the grain size becomes more consistent. The content of gathered clot of Nd rich phase reduces, whose composition changes to eutectic one. Magnetic properties are improved, and the value of (BH) max is enhanced by 20～30?kJ/m 3.

关 键 词：回火 显微组织 富Nd相 ND-FE-B 

分 类 号：TM271[一般工业技术—材料科学与工程]