CVD-SiC 阵列结构对 ZrB₂/SiC 涂层抗烧蚀性影响

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.