Effect of CVD-SiC array structure on ablation resistance of ZrB₂/SiC coatings

Influence of array structure on the performance of ZrB₂/SiC coatings was studied by using femtosecond laser to prepare arrays with different sizes on the surface of the Chemical Vapor Deposition (CVD) -SiC interlayer. Results showed that with the increase of laser etching frequency, the depth of the array structure increased from 30 μm to 150 μm. After 600 s of oxyacetylene combustion, the surface temperature of the ZrB₂/SiC coating decreased gradually with the increase of CVD-SiC microstructure depth, and the lowest surface temperature reached 1 700 ℃, which decreased by nearly 200 ℃. The color of the combustion center area transitioned from white to light gray. For the samples with an etching frequency of 5 times, after a single cycle of 600 s, the mass combustion rate and linear combustion rate were -7.4 × 10^-5 g/s and -13.3 μm/s respectively. The array structure increased the contact area between the ZrB₂/SiC coating and the CVD-SiC interlayer, thereby increasing the thermal conductivity, reducing heat accumulation, and ultimately enhancing the anti-combustion performance of the ZrB₂/SiC coating.