Enhancing thermal shock and hot corrosion resistance of PCS-derived ceramic coatings on titanium alloys by SiC whiskers

Thermal shock and hot corrosion resistance of SiC whisker enhanced polycarbosilane-derived ceramic coatings on TC4 substrate were studied. The mass loss of coating enhanced by SiC whiskers was 0.125 mg·cm⁻² after 200 thermal shock cycles from 600 °C to room temperature, which was reduced by 82.8 % compared with that of without SiC whiskers. The magnitude of mass fluctuation during hot corrosion at 600 °C for 200 h is significantly lower for coatings with SiC whiskers than without SiC whiskers. SiC whiskers not only prevent the formation and propagation of penetrating cracks, but also increase the viscosity of molten glass fillers which can repair the formed cracks and pores, thereby enhancing the thermal shock and hot corrosion resistance.