Effect of the addition of Al2O3 nanoparticles on the magnetic properties of Fe soft magnetic composites

• Fe particles were coated with Al2O3 nanoparticle via heat treatment.
• Coating layers were uniform and dense.
• The properties of SMCs with the Al2O3 addition were excellent over wide frequencies.

We investigated the effect of the addition of Al2O3 nanoparticles on the permeability and core loss of Fe soft magnetic composites coated with silicone. Fourier transform infra-red spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy analysis revealed that the surface layer of the powder particles consisted of a thin insulating Al2O3 layer with uniform surface coverage. The permeability and core loss of the composite with the Al2O3 addition annealed at 650 °C were excellent. The results indicated that the Al2O3 nanoparticle addition increases the permeability stablility with changing frequency and decreases the core loss over a wide range of frequencies.

SEM images of Fe powder with the addition of Al2O3 nanoparticles shows that the surface of the Fe particles adhered well to the Al2O3 particles to form a dense and uniform insulation coating layer.Figure optionsDownload as PowerPoint slide