Influence of carbothermic reduction temperature on electromagnetic and microwave absorption properties of double loss Ti₃SiC₂/Co₃Fe₇ powders

In this study, we prepared double loss Ti₃SiC₂/Co₃Fe₇ powders by carbothermic reduction process at different temperatures. The powders were characterized and the electromagnetic wave absorption properties were investigated. As the carbothermic reduction temperature increased from 800 °C to 1000 °C, the intensities of diffraction peaks for Co₃Fe₇ increased and the particles grew up. For the Ti₃SiC₂/Co₃Fe₇ powders, the complex permittivity also increased but the complex permeability decreased with the rising temperature. The Ti₃SiC₂/Co₃Fe₇ powders synthesized at 900 °C owned the most favorable microwave absorption performance. For the sample in 2.4 mm thickness, an effective absorption bandwidth could be obtained in the frequency range from 8.79 to 11.92GHzwith a minimum reflection loss value of −31.2 dB at 10 GHz. Considering the excellent chemical stability and microwave absorption performance, the Ti₃SiC₂/Co₃Fe₇ powders could be used as a promising absorbent for high temperature application.