以低密度C/C为坯体,采用前驱体浸渍裂解法(PIP)制备ZrC-SiC-C/C复合材料,研究其微观结构和烧蚀性能,并探讨其抗氧化烧蚀行为.结果表明:ZrC-SiC双元陶瓷相弥散分布于基体中,且各相界面结合良好;ZrC-SiC-C/C复合材料表现出良好的抗氧化烧蚀性能,经2 200℃/120 s等离子体烧蚀后,其线烧蚀率和质量烧蚀率分别为1.67×10-4 mm·s-1和6.04×10-4 g·s-1.烧蚀温度为2 200℃时,材料表面形成的ZrO2-SiO2二元共熔体系氧化膜,有效抑制氧化性气氛向材料内部的渗透,减缓火焰对材料的剥蚀作用;烧蚀温度为2 500℃时,材料表面形成以表层为ZrO2和底层为ZrO2-SiO2二元共熔体系的氧化膜,其中ZrO2层阻挡热量向内部传递,有助于底层形成致密的氧化层.
ZrC-SiC-C/C composites were fabricated by precursor infiltration and pyrolysis method (PIP) using the C/C with a low density as performs.The microstructure and ablation performance of the composites were investigated,and the anti-oxidant ablation behavior was discussed,particularly.The results show that ZrC-SiC dual ceramic phases are dispersed in the matrix,and a good interface between different phases is obtained;ZrC-SiC-C/C composites have an excellent anti-oxidant ablation performance.After ablation at 2 200℃ for 120 s by plasma flame,the linear and mass ablation rates of composites are 1.67×10-4 mm·s-1 and 6.04×10-4g·s-1,respectively.When the ablation temperature is 2 200℃,ZrO2-SiO2 binary eutectic systemas a oxide film is formed on the surface,which can effectively prevent the infiltration of oxidation atmosphere,and reduce the denudation of flame on the material.When the ablation temperature rises to 2 500℃,aoxide membrane structure with the ZrO2 as the outer layer and ZrO2-SiO2 binary eutectic system as the inner layer is generated on the surface.ZrO2 layer can inhibit heat transmitting into interior,which contributes to form a dense oxide layer at the bottom.
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