In Situ Grown 1D/2D Structure of Dy(3)Si(2)C(2) on SiC(w) for Enhanced Electromagnetic Wave Absorption

To improve electromagnetic wave (EMW) absorption performance, a novel nano-laminated Dy(3)Si(2)C(2) coating was successfully in situ coated on the surface of SiC whisker (SiC(w)/Dy(3)Si(2)C(2)) using a molten salt approach. A labyrinthine three-dimensional (3D) net was constructed by the one-dimensional (1D) SiC(w) coated with the two-dimensional (2D) Dy(3)Si(2)C(2) layer with a thickness of ~100 nm, which significantly improved the EMW absorption properties of SiC(w). Compared to pure SiC(w) with the minimum reflection loss (RL(min)) value of −10.64 dB and the effective absorption bandwidth (EAB) of 1.04 GHz for the sample with a thickness of 4.5 mm, SiC(w)/Dy(3)Si(2)C(2) showed a significantly better EMW absorption performance with RL(min) of −32.09 dB and wider EAB of 3.76 GHz for thinner samples with a thickness of 1.76 mm. The enhancement of the EMW absorption performance could be ascribed to the improvement of impedance matching, enhanced conductance loss, interfacial polarization as well as multiple scattering. The SiC(w)/Dy(3)Si(2)C(2) can be a candidate for EMW absorber applications due to its excellent EMW absorption performance and wide EAB for relatively thin samples, light weight, as well as potential oxidation and corrosion resistance at high temperatures.