Effect of Magnetic Field Annealing on Microstructure and Magnetic Properties of FeCuNbSiB Nanocrystalline Magnetic Core with High Inductance
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초록
Transverse magnetic field annealing (TFA) was carried out on Fe73.5Cu1Nb3Si15.5B7 nanocrystalline magnetic core with the aim at decreasing coercivity (Hc) while keeping high inductance (Ls). The magnetic field generated by direct current (DC) was applied on the magnetic core during different selected annealing stages and it was proved that the nanocrystalline magnetic core achieved lowest Hc when applying transverse field during the whole annealing process (TFA1). Although the microstructure and crystallization degree of the nanocrystalline magnetic core exhibited no obvious difference after TFA1 compared to no field annealing, the TFA1 sample showed a more uniform nanostructure with a smaller mean square deviation of grain size distribution. Hc of the nanocrystalline magnetic core annealed under TFA1 decreased along with the increasing magnetic field. As a result, the certain size nanocrystalline magnetic core with low Hc of 0.6 A/m, low core loss (W at 20 kHz) of 1.6 W/kg under flux density of 0.2 T and high Ls of 13.8 μH were obtained after TFA1 with the DC intensity of 140 A. The combination of high Ls with excellent magnetic properties promised this nanocrystalline alloy an outstanding economical application in high frequency transformers.
Abstract
Transverse magnetic field annealing (TFA) was carried out on Fe73.5Cu1Nb3Si15.5B7 nanocrystalline magnetic core with the aim at decreasing coercivity (Hc) while keeping high inductance (Ls). The magnetic field generated by direct current (DC) was applied on the magnetic core during different selected annealing stages and it was proved that the nanocrystalline magnetic core achieved lowest Hc when applying transverse field during the whole annealing process (TFA1). Although the microstructure and crystallization degree of the nanocrystalline magnetic core exhibited no obvious difference after TFA1 compared to no field annealing, the TFA1 sample showed a more uniform nanostructure with a smaller mean square deviation of grain size distribution. Hc of the nanocrystalline magnetic core annealed under TFA1 decreased along with the increasing magnetic field. As a result, the certain size nanocrystalline magnetic core with low Hc of 0.6 A/m, low core loss (W at 20 kHz) of 1.6 W/kg under flux density of 0.2 T and high Ls of 13.8 μH were obtained after TFA1 with the DC intensity of 140 A. The combination of high Ls with excellent magnetic properties promised this nanocrystalline alloy an outstanding economical application in high frequency transformers.
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