Microstructure features of high performance soft magnetic alloy Fe-3 wt.% Si prepared by metal injection molding

The effects of sintering parameters and microstructure features on magnetic properties of Fe-3 wt.% Si alloy prepared by metal injection molding (MIM) was investigated in this study. The sample with high density, the saturation induction (Bs) of 2.0 T, maximum permeability (mu(max)) of 25 mH/m, coercivity of 22.4 A/m was obtained at 1300 degrees C for 4 h in hydrogen atmosphere, and the properties of which are close to that of high silicon steel. The microstructure, impurities of C and O, distribution of grain boundary angles and magnetic domain of the sintered alloys were analyzed in correlation with the magnetic properties. It is found that a suitable large grain size of about 300 mu m and large grain boundary angles distributed in the range of 30 degrees-60 degrees are beneficial to soft magnetic properties. Moreover, uniform and broad magnetic domains also play an important role in preparation of high performance soft magnetic materials.

Automated summary

Appropriate large grain size and distribution of large grain boundary angles in the range of 30 degrees to 60 degrees are beneficial to soft magnetic properties; uniform and broad magnetic domains also play an important role in the preparation of high-performance soft magnetic materials.