Research on high-iron-content FeBCSiP amorphous alloy ultra-thick ribbon and its properties

<p indent="0mm">The mass production and industrial application of Fe-based amorphous soft magnetic alloy ribbons have been achieved. Increasing ribbon thickness can increase the lamination factor of the amorphous alloy core and reduce the volume of the core, meeting the demands of the current technology for miniaturization and high integration of power electronic devices and equipment. However, due to the limitation of amorphous forming ability and industrial production conditions, it is still difficult to produce industrial Fe-based soft magnetic amorphous alloy ribbons with the thickness exceeding <sc>30 μm.</sc> In this paper, ultra-thick amorphous alloy ribbon with the nominal composition of Fe_81.8B_12.8C_2.8Si_1.8P_0.8, a thickness of <sc>35 μm</sc> and a width of <sc>50 mm</sc> (denoted as AA35 ribbon) was successfully prepared by using the industrial equipment. The saturation magnetic flux density (<italic>B_s</italic>) of the ribbon is <sc>1.67 T</sc> and the coercivity (<italic>H_c</italic>) of the ribbon after optimized magnetic field annealing is <sc>1.8 A/m.</sc> Moreover, the iron loss under the conditions of the working frequency of <sc>1 kHz</sc> and the working magnetic flux density of <sc>1.55 T</sc> (<italic>P</italic>_{<italic>s</italic>(1 kHz-1.55 T)}) is only <sc>12.04 W/kg.</sc> Compared with the industrialized 1K101 amorphous alloy ribbon (<italic>B_s</italic> = <sc>1.56 T,</sc> with the thickness of <sc>25 μm),</sc> AA35 ribbon has lower iron loss under high working magnetic flux density, Particularly, it can even be used when the working magnetic flux density is in the range of <sc>1.50–1.60 T</sc> and the working frequency is in the range of <sc>1–5 kHz.</sc> These results provide a high-<italic>B_s</italic> ultra-thick amorphous soft magnetic alloy ribbon material for industrial applications, and simultaneously offer the corresponding performance control technology for optimizing the soft properties.