Enhanced antioxidation and microwave absorbing properties of SiC/SiO2 coating on carbon fiber

Abstract

In the manuscript, a uniform SiC/SiO 2 coating was successfully prepared on the surface of carbon fiber by electrolytic plasma spraying method, which is beneficial to the dielectric loss and interfacial polarization. The antioxidation and absorption capacity of electromagnetic waves were greatly improved. The surface morphology, chemical composition, oxidation resistance and electromagnetic wave absorption properties of the coated carbon fibers were analyzed in detail. The effect of sample thickness on the electromagnetic wave loss was investigated in 2-18 GHz. The absorbing mechanism of the coated carbon fiber was discussed. The coated carbon fiber exhibits superior absorbing properties due to the synergistic effect of dielectric loss and reflection loss. The minimum reflection loss of − 11.6 dB at the thickness of 2.3 mm at 7.1 GHz. Meanwhile, the SiC/SiO 2 coating on carbon fiber also has oxidation resistance, which was 28% higher than the bare sample.

A theoretical investigation on the quarter-wavelength model — part 1: analysis

“…When Z in =Z 0 , the reflected beam r is still present though |s 11 | or |RL| is zero via wave cancellation [11]. However, confusion between Z in and Z M is commonly found in publications as is illustrated by the false claim that when Z in =Z 0 , all the incident microwaves penetrate through the interface into the film [23,24,29,36,37,40,41].…”

Progress on Microwave Absorption Performance of Carbon Fiber Reinforced Composites

“…The 2.75 mm large-aperture honeycomb at a coating thickness of 0.05 mm shows the best performance, but thicker coatings weaken its electrical properties. Additionally, taller honeycombs have better mechanical and electrical characteristics, particu- [91] larly in absorbing high-frequency signals. Yang et al [97] tackled the issue of high density and excessive coating thickness of absorbent carbonyl iron powder particles with an absorbent coating applied to CFRP.…”

“…Typically prepared through the CVD method, SiC exhibits excellent chemical compatibility with carbon fiber alongside adjustable high-temperature resistance and dielectric properties. [90] Bu et al [91] use the plasma electrolytic spraying approach, the SiC/SiO 2 coating was effectively created on the surface of the CFRP, as shown in Figure 16. Electromagnetic waves can readily penetrate the inside thanks to the homogenous SiC/SiO 2 layer around the carbon fiber.…”

“… Preparation process and test results of SiC/SiO 2 coating. Copyright 2020, Journal of Materials Science: Materials in Electronics [91] …”

State-of-the-art in carbides/carbon composites for electromagnetic wave absorption

“…CFs have high electrical conductivity and powerful intrinsic loss capability, while the mismatched impedance with free space always brings intensive reflection of incident EM wave rather than desirable absorption, and thus the core purpose of SiC growth on their surface is to improve the impedance matching to allow the heterogeneous propagation of EM wave from free space to EWAMs. 154 , 155 , 156 Su et al. coated CFs with PCS layers and then converted the PCS layers in SiC nanowires.…”