Effect of annealing process on magnetic properties of Fe80Co3Si3B10P1C3 amorphous alloy magnetic cores

The effects of normal annealing (NA) and magnetic field annealing (FA) on the magnetic characteristics of Fe80Co3Si3B10P1C3 amorphous ribbon wound cores are systematically studied to explore the difference in core losses by changing the holding time and heat treatment temperature. It is found that the optimal holding time of 40 min of NA could get the minimum loss (Pcm) and coercivity (Hc) of 0.63 W/kg (50 Hz, 1.4 T) and 10.81 A/m, respectively. Further investigations are made to explain how Fe80Co3Si3B10P1C3 core loss and DC magnetic characteristics were affected by FA. The Pcm and Hc decrease to 0.41 W/kg (50 Hz, 1.4 T) and 8.44 A/m, respectively, with increasing magnetic field intensity by applying a transverse magnetic field annealing (TFA) within a specific range, while longitudinal magnetic field annealing (LFA) shows the opposite effect. The LFA core exhibits a higher magnetic flux density with B3500A/m = 1.71 T, 1.5% higher than the TFA core and 5.8% higher than the as-quenched (AQ) core.