Strength degradation of SiC-coated carbon fibres

Influence of SiC coating thickness on mechanical properties of SiCf/SiC composite

“…a C-H group) on the surface of SiC fibres during the coating process, owing to the formation of volatile hydrogen, lead to an increment of the surface defects of the fibres. This was confirmed by Wang et al [35] in their work on the SiC coating of the carbon fibre. In the present study, the existing $30 nm carbon on the surface of KD-I fibre [36] made the fibre easy to be attacked.…”

“…Deposition of non-stoichiometric SiC, causing a decrease in strength. During the CVD process, a small amount of free silicon or carbon always existed [35]. The existence of free silicon, either disordered the structure of SiC and formed a new source of cracks or attacked the carbon on fibre surface resulting in properties degeneration of the KD-I fibre.…”

Novel Synthesis and Characterization of High Quality Silicon Carbide Coatings on Carbon Fibers

“…As is well documented in the literature, the coating thickness has great effects on mechanical strength of carbon fibers . If the coating is too thin, it may not be able to serve properly.…”

Tensile strength, oxidation resistance and wettability of carbon fibers coated with a TiC layer using a molten salt method

“…Difference in the thermal expansion coefficients of the carbon fibers and coating could cause residual stress at the interface during cooling to room temperature after deposition. The internal residual stress will result in cracks in the coating if the acting load achieves a critical value, in view of the coating having a lower fracture strain than that of the fiber [14].…”