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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（12）
• 页码范围: 2785-2798
• 页数: 14页
• 语种: 英文

摘要

Mosaic structure ZrC-SiC coatings were fabricated on low-density,porous C/C composites via thermal evaporation and an in-situ method.ZrC 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 ofthe porous C/C composites.Ablation analysis showed that the defects in the coatings originate from the boundary between the ZrC and holes created by the consumption of SiC at 2500℃.After ablation for 200 s at 3000 ℃,a dense ZrO2 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 ZrC-SiC coatings were-0.46 ± 0.15 mg cm-2·s-1 and -1.00± 0.04 μm s-1,respectively.