Effect of partcle grading on the properties of amorphous Fe-Cr-Si-B-C soft magnetic powder cores
The atomized powder of amorphous Fe-Cr-Si-B-C was used as raw material,and soft magnetic powder cores were prepared by changing the mixed mass ratio(powder gradation)of coarse powder(-250 to+400 mesh)and fine powder(-600 mesh),respectively.The effective permeability,DC bias performance,and power loss were investigated.Effective permeability is positively correlated with the density of powder core,which can be improved with proper particle grading.When the effective permeability is almost identical to each other,the uniformity of air gap in the magnetic cores can be increased with the proper mass ratio of fine powders.Accordingly,the DC-bias performance can be improved and power loss at high-frequencies(MHz)decreased.The effective permeability was 19.52 at 1 MHz for the sample with the mixing ratio of 40:60(coarse powder:fine powder).Moreover,the percentage of permeability is 83.04%under the DC bias field of 100 Oe.The power loss at 1 MHz/20 mT is 1467.5 mW/cm3.The 40:60 sample shows a 2.4%increase in density and a 5.8%reduction in porosity compared to the sample with raw powders,and the effective permeability at 1 MHz increases by 5.9%.
Fe-Cr-Si-B-C amorphous powderssoft magnetic powder coresparticle gradingDC-bias performance
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