Abstract
Polycarbosilane-derived (PCS-derived) ceramic coatings were prepared through dip coating with SiC as fillers. The effect of SiC filler shape including nanoparticles and nanowires on microstructure and corrosion resistance was investigated. In comparison with SiC nanoparticles, coatings fabricated with SiC nanowires have lower micro-crack width and better corrosion resistance. The micro-cracks width is about 0.19 µm for SiC nanoparticles, while the micro-cracks almost disappear for SiC nanowires. The corrosion current density for SiC nanowires is 2.22 × 10−8 A/cm2, which is one order of magnitude lower than that for SiC nanoparticles. SiC nanowires not only can compensate the shrinkage of PCS in the way same as nanoparticles, but also can suppress the propagation of micro-cracks. The synergy effects of compensation and suppressing significantly decrease the micro-cracks in the coating, and thus enhance the corrosion resistance.
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