Ge Hailang, Chen Xianqing, Li Guangyu, Zhang Lu
College of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China.
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Materials (Basel). 2024 Sep 17;17(18):4565. doi: 10.3390/ma17184565.
To study the ablation properties and differences of plain-woven SiC/SiC composites under single and cyclic ablation. The ablation test of plain-woven SiC/SiC composites was conducted under an oxyacetylene torch. The results indicate that the mass ablation rate of cyclic ablation is lower than that of single ablation, whereas the line ablation rate is higher. Macro-microstructural characterization revealed the presence of white oxide formed by silica on the surface of the ablation center region. The fibers in the central region of the ablation were ablated layer by layer, and the broken fiber bundles exhibited a spiky morphology with numerous silica particles attached. The oxide layer on the surface and the silica particles on the fibers, which are in the molten state formed in the high-temperature ablation environment, contribute to resisting ablation. Thermal shock during cyclic ablation also played a role in the ablation process. The thermal shock causes cracks in the fiber bundles and matrix of the SiC/SiC composites. This study helps to apply SiC/SiC composite to complex thermal shock environments.
研究平纹编织SiC/SiC复合材料在单次烧蚀和循环烧蚀下的烧蚀特性及差异。在氧乙炔焰炬下对平纹编织SiC/SiC复合材料进行烧蚀试验。结果表明，循环烧蚀的质量烧蚀率低于单次烧蚀，而线烧蚀率更高。宏观微观结构表征显示，在烧蚀中心区域表面存在由二氧化硅形成的白色氧化物。烧蚀中心区域的纤维被逐层烧蚀，断裂的纤维束呈现出带有大量附着二氧化硅颗粒的尖刺形态。表面的氧化层和纤维上处于高温烧蚀环境中形成的熔融态二氧化硅颗粒有助于抵抗烧蚀。循环烧蚀过程中的热冲击在烧蚀过程中也起到了作用。热冲击导致SiC/SiC复合材料的纤维束和基体出现裂纹。该研究有助于将SiC/SiC复合材料应用于复杂热冲击环境。
