Ball milling modification impact on the electromagnetic wave absorption properties of Fe83.3Si4B7P4Cu0.7Co1 amorphous powder

The enhanced broadband absorption and optimized impedance matching were of significant importance for achieving "thin, light, wide, and strong" in absorber materials. In this study, Fe83.3Si₄B₇P₄Cu0.7Co₁ amorphous alloy powders were prepared using vacuum air atomization method. The powders were mechanically crushed via high-energy ball milling, and the microstructure, morphology, and absorption properties of the materials were characterized. The results show that the loss mechanism of Fe83.3Si₄B₇P₄Cu0.7Co₁ amorphous alloy powders is primarily magnetic loss, including eddy current loss and natural resonance. The flattening of the powders not only increases anisotropy and optimizes impedance matching but also enhances the complex permittivity and permeability, endowing the material with excellent bandwidth effects and electromagnetic wave loss capability. The maximum effective absorption bandwidth (ΔfRL<-10 dB) of the sample ball-milled for 6 hours can reache 8.29 GHz (9.71 GHz ~ 18 GHz), with the minimum reflection loss(RLmin) at 13.2 GHz being -41.73 dB and a sample thickness of 2 mm. This indicates that the material has good absorbing performance and exceptional bandwidth capabilities in the mid to high-frequency range, covering part of the X-band and the entire Ku-band, offering greater flexibility and applicability in practical applications.