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

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.