Ablation characteristics of mosaic structure ZrC-SiC coatings on low-density, porous C/C composites

Mosaic structure Zr C-SiC coatings were fabricated on low-density, porous C/C composites via thermal evaporation and an in-situ method. Zr C was packed in a typical lamellar mode, and the mosaic structure was formed by the deposition of Zr and Si atoms on the shallow surface of the porous C/C composites.Ablation analysis showed that the defects in the coatings originate from the boundary between the Zr C and holes created by the consumption of SiC at 2500?C. After ablation for 200 s at 3000?C, a dense ZrO;layer formed on the coating surface, and the defects were sealed owing to the continuous supply of ablative components. The mass and line ablation rates of the Zr C-SiC coatings were-0.46 ± 0.15 mg cm;·s;and-1.00± 0.04 μm s;, respectively.