Furan resin and fir powder pretreated by FeCl₃ and aqueous ammonia solution were used to fabricate α-Fe/Fe₃C/woodceramic nanocomposite. The bands of the pretreated wood powder were characterized by Fourier transform infrared spectroscopy (FTIR). The structural characterization of the nanocomposites was performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The microwave absorption of the nanocomposites was measured by a vector network analyzer in the range of 2⁻18 GHz. The mechanical properties of the composites were also investigated. XRD and SEM results show that the α-Fe and Fe₃C nanoparticles are in-situ generated and disperse in the matrix of the woodceramic. The diameters of these nanoparticles increase with the increasing of concentration of FeCl₃ solution. The experimental results show that both the complex permittivity and the complex permeability of α-Fe/Fe₃C/woodceramic nanocomposites increase as the concentration of FeCl₃ solution increases. The composites pretreated with 0.60 mol·L-1 FeCl₃ have the best absorption properties. The maximum value of reflection loss (RL) at 3 mm thickness reaches -25.60 dB at 10.16 GHz and the bandwidth below -10 dB is about 2.5 GHz. Compared to woodceramic, the bending strength and compressive strength of α-Fe/Fe₃C/woodceramic nanocomposites increase by 22.5% and 18.7% at most, respectively.
Keywords: Fe3C; absorption properties; mechanical properties; woodceramic; α-Fe.