Ablation characteristics of mosaic structure ZrC-SiC coatings on low-density, porous C/C composites
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第12期
论文作者：Yonglong Xu Wei Sun Xiang Xiong Fuqun Liu Xingang Luan
文章页码：2785 - 2798
摘 要：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 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 Zr C-SiC coatings were-0.46 ± 0.15 mg cm-2·s-1 and-1.00± 0.04 μm s-1, respectively.
Yonglong Xu1，Wei Sun1，Xiang Xiong1，Fuqun Liu2，Xingang Luan3
1. State Key Laboratory of Powder Metallurgy, Central South University2. China Academy of Launch Vehicle Technology3. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University
摘 要：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 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 Zr C-SiC coatings were-0.46 ± 0.15 mg cm-2·s-1 and-1.00± 0.04 μm s-1, respectively.
关键词：
