高矫顽力的低钕Nd₉(FeCoZrAl)₈₅B₆ 纳米晶合金的制备

来源期刊：中国有色金属学报1999年第2期

论文作者：刘颖 陈悦 涂铭旌 王永强 赵文金 李聪 彭倩 李卫军

文章页码：259 - 262

关键词：Nd₂Fe₁₄B/α-Fe纳米晶 矫顽力 热处理 磁 性

Key words：Nd₂Fe₁₄B/α-Fe nanocomposite ; rapidly quenching speed ; heat treatment ; magnetic properties

摘    要：采用单辊快淬工艺制备了一种低钕含量Nd₉(FeCoZrAl)₈₅B₆纳米晶合金，研究了快淬工艺与热处理工艺对该合金纳米晶的形成及磁性的影响。结果表明快淬速度和热处理温度都明显地影响低钕含量Nd₉(FeCoZrAl)₈₅B₆纳米晶的形成及其磁性（内禀矫顽力_jH_c，矫顽力_bH_c，剩磁B_r和最大磁能积 (BH)_m)。快淬速度23m/s制备的非晶态合金，在685℃处理30min，可获得最佳的磁性，其粘结磁体的密度为6.01g/cm³时，B_r=655mT，_jH_c=639.2 kA/m， _bH_c=381.6 kA/m， (BH)_m=65.68kJ/m³。

Abstract: A Nd₉(FeCoZrAl)₈₅B₆ nano-structured alloy has been prepared by melt spinning onto a copper roll, and the effect of the circumferential speed and the heat treatment process on its crystallizing and magnetic properties has been studied. The results showed that the speed and the heat treatment process influence obviously the crystallizing of Nd₂Fe₁₄B and α-Fe phase, the grain size and the magnetic properties of the alloy. Firstly, the magnetic properties increase with increasing the rapidly quenching speed, and then decrease. When the heat treatment temperature is raised, the magnetic properties increase, but the magnetic properties decrease with continuing to raise heat treatment temperature.The reasons are that the difference of the cr ystallizing and the grain size of Nd₂Fe₁₄B phase α-Fe results in the difference of the magnetic coupling effect between the Nd₂Fe₁₄B grains and the Nd₂Fe₁₄B grain and α-Fe grain. Thus, the nano-crystalline alloy has different magnetic properties. The alloy possesses optimum magnetic properties, and the magnetic properties of its epoxy resin bonded magnet are B_r= 655 mT, _jH _c=639.2kA/m, _bH_c=381.6kA/m, (BH)_m=65.68 kJ/m³.