Effect of phosphoric acid concentration on performance of FeSiCr@phosphate/sodium silicate soft magnetic powder cores
FeSiCr@phosphate/sodium silicate soft magnetic powder cores were prepared based on the powder metallurgy process.Experimental methods such as scanning electron microscopy(SEM),X-ray diffraction(XRD)and salt spray with loss separation calculations were used to investigate the effects of different mass fractions of phosphoric acid(0-1.5％)on the soft magnetic properties and corrosion resistance of FeSiCr powder cores.The results show that the density and direct current bias performance of the magnetic powder core can be improved by moderately increasing the phosphoric acid concentration,and the core loss can also be significantly reduced.However,excessive phosphoric acid concentration will deteriorate the uniformity of the insulating layer and increase the resistance to the movement of the domain walls,leading to the increase in the core loss and decrease in the permeability.In addition,the corrosion resistance of the magnetic powder core decreases with the increase of phosphoric acid concentration.When the phosphoric acid addition is 1.0％,the prepared FeSiCr magnetic powder core has the optimum soft magnetic performance with permeability of 38.3(100 kHz)and the total loss of 646.24 mW/cm3(1 MHz and 20 mT).
FeSiCr alloysoft magnetic powder coresinsulated coatingsoft magnetic propertiescorrosion resistance
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