Improving the Soft Magnetic Properties of Fe-Co-B-Zr-Nb Alloy by Tuning the Fe/Co Ratio

Amorphous (FeSUBx/SUBCoSUB1-x/SUB)SUB85/SUBBSUB5/SUBZrSUBy/SUBNbSUB10-y/SUB (x = 0.6, 0.7, 0.8, or 0.9 and y = 7 or 8 at.%) ribbons were fabricated by the melt-spinning technique, and their thermal and magnetic properties were investigated. The results showed that all alloys had a fully amorphous structure, and the substitution of Zr for Nb resulted in high thermal stability and high saturation flux density (BSUBs/SUB) with fairly low coercivity (HSUBc/SUB 21 A/m). Moreover, by varying the Fe/Co ratio, the optimum ratio with the highest BSUBs/SUB and low HSUBc/SUB was determined. As the Fe/Co ratio changed from 6:4 to 9:1, HSUBc/SUB decreased from approximately 20 to 9 A/m, and BSUBs/SUB also decreased gradually. A saturation flux density of 1.33 T was achieved with a coercivity of 9 A/m after optimization.