Influence of iron powder purity and particle size on the magnetic properties of phosphated iron soft magnetic composites

This paper investigates the effect of iron powder purity and particle size on the magnetic properties of phosphated iron soft magnetic composites(SMC).The results showed that the phosphating process give rise to a large coverage of the iron powders surface by the iron phosphate coating.The density and permeability of phosphated iron samples shows an increase with increased the iron powder purity or particle size.The sample with higher iron powder purity exhibits lower hysteresis loss.With increase in the particle size,magnetic loss increases significantly at medium and high frequencies,and the higher the frequency the more obvious.