Effect of adding Fe11Ni6 alloy and annealing temperature on magnetic properties of Fe32Si4.4B4CrC1.4 powder cores

This paper mainly studied magnetic properties of amorphous magnetic powder core (Fe32Si4.4B4CrC1.4) by addition of micron scale magnetic particles Fe11Ni6. The insulating layer uses the inorganic-organic coating (orthophosphoric acid and epoxy resin), in order to improve the magnetic properties of the magnetic powder core. By controlling different annealing temperatures on (100-x) wt% Fe32Si4.4B4CrC1.4 + x wt% Fe11Ni6 (x = 0, 5, 10, 15, 20) composite magnetic powder core, it was compared with magnetic properties of composite soft magnetic cores under other identical experimental conditions. The results showed that under the same annealing temperature (400 degrees C) and along with the increase of the content of Fe11Ni6 composite magnetic powder core permeability increases. When H-m = 300 A/m (the H-m is the maximum magnetic field strength), the permeability (mu) of 80 wt% Fe32Si4.4B4CrC1.4 + 20 wt% Fe11Ni6 alloy powder is about 14.2. Under the same experimental conditions, the quality factor (Q) value of 90 wt% Fe32Si4.4B4CrC1.4 + 10 wt% Fe11Ni6 can be as high as 240 in the range of 100 kHz to 1000 kHz. The increase of Q value is of great significance for reducing eddy current loss of magnetic core. The magnetic loss (P-cv) of 95 wt% Fe32Si4.4B4CrC1.4 + 5 wt% Fe11Ni6 decreases at the annealing temperature of 450 degrees C and increases significantly when the annealing temperature continues to increase. The optimum annealing temperature obtained in this experiment also provides a reference for other FeSiB magnetic cores. The Q value of 95 wt% Fe32Si4.4B4CrC1.4 + 5 wt% Fe11Ni6 reaches about 215 when the annealing temperature is 500 degrees C.