Study on the Optimization of Fe Content of FeSiBC Amorphous Powders

In this paper, four types of amorphous spherical powders with different Fe contents were produced by a novel gas–water combined atomization process, and the corresponding magnetic powders cores (MPCs) were fabricated. It was found that as Fe content was increased from 92.66 to 94.55 wt%, both the D₅₀ and enthalpy of crystallization of the powders decreased and then increased, while the coercivity increased and then decreased together with a linearly enhanced saturation magnetization. Among them, Fe_94.55Si_1.05B_4.3C_0.1 amorphous powders have smaller particle size (D₅₀ = 31.67 μm), excellent circularity (0.95), good thermal stability (∆T = 46 K), and highest saturation magnetization (172 emu g⁻¹), thus showing the most excellent overall properties. The core loss and the permeability of the corresponding MPCs for the Fe_94.55Si_1.05B_4.3C_0.1 amorphous powders are 79.76 kW m⁻³ (0.02 T, 100 kHz) and 25.95, respectively, which shows the possibility to develop amorphous powders and MPCs with high Fe content through the present gas–water combined atomization.