To improve electromagnetic wave (EMW) absorption performance, a novel nano-laminated DySiC coating was successfully in situ coated on the surface of SiC whisker (SiC/DySiC) using a molten salt approach. A labyrinthine three-dimensional (3D) net was constructed by the one-dimensional (1D) SiC coated with the two-dimensional (2D) DySiC layer with a thickness of ~100 nm, which significantly improved the EMW absorption properties of SiC. Compared to pure SiC with the minimum reflection loss (RL) 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/DySiC showed a significantly better EMW absorption performance with RL 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/DySiC 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.
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| http://dx.doi.org/10.3390/ma16093455 | DOI Listing |
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