The influence of doping Ti on the microstructure and magnetic performances of Fe-6.5Si soft magnetic composites

A novel Ti-doped Fe-6.5Si soft magnetic composites (SMCs) was prepared in this work. Effects of doping Ti on magnetic performances of Fe-6.5Si SMCs were investigated. The results show that only α-Fe(Si,Ti) phase can be detected in Ti-doped Fe-6.5Si particles and SMCs. After doping Ti the saturation magnetization of Fe-6.5Si powders significantly reduces and the coercivity first decreases then increases with increasing the Ti content. Ti additions can increase the electrical resistivity of Fe-6.5Si alloy. Introduction of Ti decreases the total core loss of Fe-6.5Si SMCs, among which hysteresis loss makes a greater contribution than eddy current loss. The magnetic permeability of Ti-doped Fe-6.5Si SMCs increases first then drops with the Ti content ranging from 0 to 2.0 wt %. Compared with Ti-free Fe-6.5Si SMCs, Fe-6.5Si SMCs doped with 0.5 wt % Ti shows lower core loss and higher effective permeability.