Fabrication of α-Fe/Fe3C/Woodceramic Nanocomposite with Its Improved Microwave Absorption and Mechanical Properties

Abstract

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.

Facile Synthesis of Fe@Fe3C/C Nanocomposites Derived from Bulrush for Excellent Electromagnetic Wave-Absorbing Properties

“…Singh et al pyrolyzed chicken feather fibers and obtained lightweight heteroatom-doped carbon which exhibited absorbing behavior in the X band . Zhou et al fabricated Fe/Fe 3 C/C nanocomposites with wood powders, and Lou et al synthesized porous Fe/C composites containing Fe 3 C or Fe 3 O 4 by an impregnation and carbonization process of waste wood. − These wave absorbers with efficient absorbing properties and easy preparations provided a green way for recycling poultry and forestry waste to be used in electromagnetic applications.…”

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

“…In recent years, magnetic carbon composites have attracted much attention owing to their combined advantages of magnetic nanoparticles and carbon components. [ 10 ] Wang et al successfully fabricate a series of core‐shell FeCo@C nanoparticles and encapsulated carbon nanocage composite materials by using FeCo Prussian blue analogs as nucleation points and polymerizing dopamine on their surfaces. The strongest reflection loss ( RL ) value is −67.8 dB located at 15.8 GHz, and the effective absorption bandwidth ( EAB ) covers 11.0–16.3 GHz with the thickness of 2.0 mm.…”

Effects of Filling Rate and Resin Concentration on Pore Characteristics and Properties of Carbon Based Wood Ceramics

“…Wood ceramics derived from natural wood or wood materials are porous ceramics, which completely retain the microscopic pore structure of natural wood [ 13 , 14 ]. According to the composition of substrate material, wood ceramics can be divided into 4 categories as shown in Figure 1 : carbon based wood ceramics [ 15 , 16 ] (C WCMs), XC (SiC, ZrC, TiC et al) based wood ceramics [ 17 , 18 ] (XC WCMs), oxide wood ceramics [ 19 , 20 ] (Oxide WCMs) and composite wood ceramics [ 21 , 22 ] (Composite WCMs).…”