非晶晶化对Nd_2Fe_(14)B/α-Fe纳米复合材料磁性能的影响

Effect of Amorphous Crystallization on Magnetic Properties of Nd_2Fe_(14)B/α-Fe Nanocomposite Material

用熔体快淬+晶化处理(RQC)工艺制备了Nd2Fe14B/α-Fe纳米复合材料,研究晶化热处理温度和时间对Nd7.5Fe86B6.5纳米复合材料磁性能的影响.结果表明:快淬速度为25 m/s时制备的Nd7.5Fe86B6.5合金薄带的最佳热处理工艺为700℃保温10 min;快淬速度为30 m/s时制备的Nd7.5Fe86B6.5合金薄带的最佳热处理工艺为700℃保温15 min,并达到最佳磁性能;在相同晶化温度下,非晶化程度越高的样品,所需的晶化时间越长;晶化热处理时不仅要完全消除磁体内的非晶相,而且要使晶粒的尺寸尽可能的小.

Nd2Fe14 B/α-Fe nanocomposite materials were prepared by the RQC technique. The effect of annealing temperature and time on magnetic property for Nd7.5 Fe86 B6.5 nanocomposite materials prepared by the RQC technique was studied. The result shows that the best annealing condition of alloy ribbons prepared by rapid quenching at 25 m/s is at 700 ℃ for 10 min,while the best annealing condition of alloy ribbons prepared by rapid quenching at 30 m/s is at 700 ℃ for 15 rain. When the annealing temperature remains invariable, the annealing time should be relatively longer for the larger volume fraction of amorphous phase in order to achieve ideal nano grains. Annealing should be well controlled to eliminate completely the amorphous phase in the magnet and to make the average grain size as small as possible.