摘要
采用XRD等方法研究了单辊急冷法制备的低钕含量的快淬Nd9(FeCoZrAl) 85 B6 非晶态合金在不同热处理工艺下的相组成、晶粒尺寸大小及其磁性能变化规律。热处理工艺对Nd2 Fe1 4 B相和α Fe相析出、晶粒尺寸大小和合金的磁性能具有明显影响。当热处理温度较低时 ,Nd2 Fe1 4 B相析出不充分 ,并出现不均匀长大 ,其晶粒尺寸反而较大 ;当热处理温度过高时 ,Nd2 Fe1 4 B相虽然析出充分 ,但其晶粒尺寸也明显长大 ;只有当热处理温度适中 ( 685℃ /3 0min) ,既可保证Nd2 Fe1 4 B相析出充分 ,又不至于明显长大 ,才能使Nd2 Fe1 4 B相和α Fe相、Nd2 Fe1 4 B相和Nd2 Fe1 4 B相晶粒间的磁耦合效应达到最佳 ,从而增大剩磁 ,使该合金的磁性能也达到最佳 ,制得的粘结磁体性能 :剩磁Br=65 5mT ,内禀矫顽力jHc=64 4 3kA·m- 1 ,矫顽力bHc=3 79 0kA·m- 1 ,最大磁能积 (BH) m=65 68kJ·m- 3。
The phase component, the grain size and the magnetic properties of rapidly quenching Nd 9 (FeCoZrAl) 85 B 6 amorphous alloy at different heat treatment were investigated. The heat treatment process influences obviously the crystallizing of Nd 2Fe 14 B and α Fe phase, the grain size and the magnetic properties of the alloy. When the heat treatment temperature is lower, the crystallizing of amorphous phase is insufficient, the grains grow unhomogeneously, so the grain size of Nd 2Fe 14 B phase is much larger. When the heat treatment temperature is much higher, although the amorphous phase is fully crystallized, the grains grow quickly and its size is much larger, too. When the amorphous alloy is heat treated at 685 ℃ with 30 min, the amorphous phase is fully crystallized and the growth of Nd 2Fe 14 B grains is not remarkable. Thus the grain size is very small, and the magnetic coupling effect reaches a maximum value between the Nd 2Fe 14 B grains and between the Nd 2Fe 14 B grain and α Fe grain, so the alloy can obtain good magnetic properties, and the magnetic properties of epoxy resin bonded magnet from the alloy are B r=655 mT, jH c= 639 2 kA·m -1 , b H c=381 6 kA·m -1 , (BH) m=65 68 kJ·m -3 .
出处
《中国稀土学报》
CAS
CSCD
北大核心
2000年第2期112-115,共4页
Journal of the Chinese Society of Rare Earths
基金
国家高性能核燃料
材料重点实验室资助
关键词
稀土
钕
热处理
磁性能
非晶态合金
永磁材料
rare earths
neodymium
amorphous alloy, heat treatment
magnetic properties
