The spherical FeSiAl powder prepared by aerosolization method was particle size optimized and proportioned,which was coated by organic-inorganic double insulation with high temperature resistant compound phosphate and silicone resin.The effects of powder particle size and proportions on the properties of material density,high frequency power loss,permeability and DC bias were systematically investigated.The results indicated that the density,permeability and power loss of soft magnetic composites decreased with reducing the powder particle size,and the DC bias characteristics improved with reducing the particle size.When the average particle size was 6.28 μm,the effective permeability at 1 MHz was 59.21,the loss at Bm=30 mT and f=1 MHz was 335.57 kW/m3,while the percent permeability at 100 Oe magnetic field was 64.42％.The particle size ratios of two groups of powders with average particle sizes of 18.76 pm and 12.72 pm showed that the density and permeability increased and then decreased with the addition of fine magnetic powders,while the loss at high frequency of Bm=30 mT and f=1 MHz decreased from 624.50 kW/m3 to 575.76 kW/m3.
FeSiAl soft magnetic compositespowder particle sizepower losseffective permeabilityDC-bias characteristics
维普
万方数据
