Effect of Iron Particle Size and Volume Fraction on the Magnetic Properties of Fe/Silicate Glass Soft Magnetic Composites

Fe/Silicate glass soft magnetic composites (SMC) were fabricated by powder metallurgy with 1000 MPa pressure at room temperature, and then annealed at 750 A degrees C for 90 min. A continuous and discontinuous layer of iron oxygen compounds FeO and Fe3O4 exit at the interface. Very fine crystalline phases Na12Ca3Fe2(Si6O18)(2) were formed in silicate glass. Crystallite formation introducing the CTE mismatch between Fe and silicate glass results in thermal stress. Therefore, the magnetic properties decrease. The particle size and volume fraction of iron powder are larger, DC magnetic properties are better, but the core loss is greater. For the Fe/ silicate glass composite, the hysteresis loss plays a leading role in iron.