Abstract：In order to study the surface passivation process of soft magnetic metal powder， gas atomized iron-silicon powder was used as raw material to prepare passivation powder under different passivation conditions， and the passivation powder was pressed into magnetic rings. The surface morphology of passivated powder was observed by scanning electron microscopy （SEM）， and the magnetic ring properties were tested. The results show that with the increase of reaction temperature or the decrease of pH value of reaction solution， the density and permeability of the magnetic core decrease， and the insulation resistance and compressive strength increase. Through the comparison of data， the passivation process with high permeability and high insulation resistance is obtained， that is， the mass ratio of Fe-Si powder and aluminum dihydrogen phosphate solution with pH 3.0 is 1∶1， and the reaction is carried out at 50 ℃ for 15 min. The magnetic ring has the best performance， the relative permeability is 36.3， the insulation resistance is 57 mΩ， the density is 7.24 g/cm3， and the compressive strength is 6.0 MPa.
李伟健，李媛媛. 铁硅粉末表面钝化工艺的研究[J]. , 2018, 28(04): 12-16.
LI Wei-jian，LI Yuan-yuan. Study on surface passivation process of iron-silicon powder. , 2018, 28(04): 12-16.
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2018, Vol. 28 
