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摘要
A uniform and continuous silica layer was coated on the surface of Fe-Si-Al powder by using a silica nanoparticle/epoxy resin composite insulation method. The Fe-Si-Al powder cores with different insulation contents were prepared through adjusting the addition amount of the silica nanoparticles. The influence of the silica insulation content on the magnetic properties of the formed powder core was studied in detail. It was found that increasing the silica insulation content decreases the effective permeability and improves the DC-bias performance, while the core loss exhibits different variation tendencies at different frequencies or at different magnetic flux densities. The fact that the addition of the nonferromagnetic silica insulation material with a high resistivity into the powder core, which can dilute the magnetic moment per volume, enhance the demagnetization field, inhibit the magnetization process, increase the hysteresis loss and decrease the eddy-current loss was regarded as the underlying mechanism for the core's magnetic properties varying with the silica insulation content. And the variation of the total loss at different frequencies or at different magnetic flux densities for the cores with different insulation contents was believed to be determined by the competition between the hysteresis loss and the eddy-current loss. Compared with the regular commercial sendust 60μ powder core products, the Fe-Si-Al powder cores fabricated in this work were proved to possess a much higher DC-bias performance. ? 2018, Chongqing Functional Materials Periodical Press Co. Ltd. All right reserved.
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