Ablation behavior of sharp-shape C/C-SiC-ZrB2 composites under oxyacetylene flame
Ablation behavior of sharp-shape C/C-SiC-ZrB2 composites under oxyacetylene flame
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尖形C/C-SiC-ZrB2复合材料在氧乙炔火焰下的烧蚀行为
DOI：
10.1016/j.jallcom.2017.04.188
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发表时间：
2017-08
影响因子：
6.2
通讯作者：
Shen Qingliang
中科院分区：
文献类型：
--
作者：
Liu Yue;Fu Qiangang;Guan Yiwen;Wang Beibei;Shen Qingliang
采用反应熔渗法制备了具有尖锐前缘形状的C/C-SiC-ZrB 2复合材料，并在热流密度为2.38 MW/m2的氧乙炔火焰中烧蚀60 s，研究了其烧蚀行为。结果表明，添加ZrB 2颗粒后，C/C-SiC复合材料的质量烧蚀率和线烧蚀率分别降低了36%和52%。复合材料的烧蚀区域根据烧蚀特征可分为边缘烧蚀区和中心烧蚀区。在边缘烧蚀区，C/C-SiC-ZrB 2复合材料表面形成了Zr-O-Si玻璃层的“镶嵌结构”，烧蚀后的C/C-SiC复合材料表面覆盖着一层熔化的SiO2层。在中心烧蚀区，熔融SiO2层不能抵抗高温、高速、高压氧乙炔火焰的强烈冲击，导致C/C-SiC复合材料保护涂层失效。在C/C-SiC-ZrB 2复合材料表面形成了一层ZrO 2烧结层，作为有效的氧物种和热流屏障，保护了复合材料免受烧蚀的进一步影响，从而使C/C-SiC-ZrB 2复合材料具有良好的结构稳定性。
C/C-SiC-ZrB2composites with sharp leading edge shape were prepared by reactive melt infiltration, and their ablation behavior was investigated by subjected to the oxyacetylene flame with a heat flux of 2.38 MW/m2for 60 s. The results show that after adding ZrB2particles the mass and linear ablation rates of the C/C-SiC composites could be reduced by 36% and 52%, respectively. The ablated regions of the composites can be divided into two regions according the ablated features: brim ablation region and center ablation region. In the brim ablation region, a kind of ‘embedding structure’ of Zr-O-Si glass layer was formed on the surface of the C/C-SiC-ZrB2composites, and the ablated surface of the C/C-SiC composites was covered by a melting SiO2layer. In the center ablation region, the molten SiO2layer cannot resist the intensive impact of high-temperature, speed and pressure oxyacetylene flame, resulting in the failure of the protective coating for C/C-SiC composites. The surface of C/C-SiC-ZrB2composites was covered by a sintered ZrO2layer, which acted as an effective oxygen species and heat flux barrier and protected the composites against further ablation, resulting in an excellent configurational stability of C/C-SiC-ZrB2composites.
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