高能球磨制备Fe-6.5%Si合金微粉的研究

Study on the Preparation of Fe-6.5%Si Alloy Micropowders by High Energy Ball Milling

Fe-6.5%Si(质量分数)合金具有优异的软磁性能,是高频电机铁芯的理想材料。采用高能行星球磨法制备了Fe-6.5%Si合金微粉。利用激光粒度分布仪、扫描电镜以及X射线衍射仪分别观测了球磨过程中粉末粒度、形貌及结构的变化。结果表明,随着球磨时间的延长,颗粒不断细化,但细化速度逐渐减小;Fe-6.5%Si合金在氩气保护下高能球磨过程中成分稳定,球磨产物为具有亚微米结构的过饱和固溶体;当球磨罐中装料量(mp=100g)一定时,理论计算和球磨实验得出最佳球料比为10∶1。

Fe-6.5%Si alloy has excellent soft magnetic properties, and therefore it was a sort of ideal material for iron core of high frequency electromotor. Fe-6.5%Si （mass fraction） alloy micropowders were prepared by high energy planetary ball milling. Size distribution, particle shape and phase structure of the samples with different milling time were investigated by means of laser particle size distribution, SEM and XRD. The results show that particle size of samples decreases, but the refinement rate of the particles decreases with prolonging milling time; Fe-6.5%Si alloy has a stable composition, supersaturated solid solution with the sub-micron structure, during high energy ball milling in argon; if the mass of samples for milling is fixed at 100 grams in every milling vial, the optimum ball-to-powder mass ratio is 10 ： 1 from theoretical derivation and milling experiments.