摘要
采用熔体快淬工艺制备了未添加Zr和添加Zr的两种复相纳米NdFeB磁粉。研究了Zr元素添加、晶化、磁化及研磨工艺对NdFeB磁粉微观组织结构及磁性能的影响。研究结果表明,Zr元素的添加可以有效抑制α-Fe晶粒的长大,从而达到细化晶粒、增强硬磁相和软磁相之间的交换耦合作用,提高磁粉磁性能的作用。含Zr钕铁硼磁粉最佳磁性能达Br=0.79 T,Hci=801 kA/m,(BH)max=98 kJ/m3。
Nanocomposite NdFeB powders with and without Zr doping were prepared by crystallizing the amorphous melt-spun ribbons. Effects of Zr doping, crystallization and magnetizing on the magnetic properties and microstructures of the NdFeB powder have been investigated. It is found that the Zr doping can restrain the formation and growth of α-Fe, refine grains, enhance exchange coupling interaction between the hard and the soft magnetic phases, and resultantly improve the magnetic properties. Under the optimal condition, the NdFeB powder has the best magnetic properties of Br=0.79 T, Hci=801 kA/m,(BH)max=98 kJ/m~3.
引文
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