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.

ZrSiO₄ bulk was prepared by pressureless sintering process and ZrSiO₄ coating was deposited on the SiC_f/SiC substrate using air plasma method. The microstructures of ZrSiO₄ bulk and ZrSiO₄ coating are both dense. A preliminary study of a water vapor corrosion test for ZrSiO₄ bulk and ZrSiO₄ coating was performed under the conditions of 1.013×10⁵ Pa, 90%H₂O/10%O₂, 1300 ℃, and low gas velocity. Results show that some pores appear on the surface of the ZrSiO₄ bulk. The main crystal phase is ZrO₂ and the weight loss of ZrSiO₄ bulk is only 0.236 mg/cm² after corrosion. The ZrSiO₄ coating peels off from the substrate after 109 h. The number and intensity of diffraction peaks of ZrO₂ in the coating increase, and the major crystal phase of the coating is still ZrSiO₄. A porous microstructure accompanied with cracks is observed on the surface of ZrSiO₄ coating after corrosion.