通过真空热压工艺制备了ZrB2-SiC材料和Csf(碳短纤维)/ZrB2-SiC超高温陶瓷基复合材料. 采用氧乙炔火焰在4186.8kW/m2的热流下分别喷吹烧蚀两种材料180s. ZrB2-SiC材料表面最高温度达到2406℃, 烧蚀后质量烧蚀率为-0.14%, 线烧蚀率为-1×10-3mm/s, Csf/ZrB2-SiC材料表面最高温度达到1883℃, 烧蚀后质量烧蚀率为-0.19%, 线烧蚀率为-4×10-4mm/s. 对两种材料烧蚀表面和剖面的分析发现, ZrB2-SiC材料烧蚀后由表及里依次形成了疏松ZrO2氧化层、SiC富集层和未反应层的三层结构, 其中SiC富集层能够起到抗氧化的作用. Csf/ZrB2-SiC
材料烧蚀后由外到内分别形成了ZrO2-SiO2氧化层、SiC耗尽层和未反应层的三层结构, 其中最外层以ZrO2为骨架, SiO2弥合其中的结构有效地阻挡了烧蚀中氧的侵入.
ZrB2-SiC and Csf/ZrB2-SiC, two kinds of ultra-high temperature ceramic composites were fabricated by hot-pressing. The ablation behavior of them was studied by oxyacetylene torch test at a heat flux of 4186.8kW/m2 for 180s. For ZrB2-SiC, the surface temperature increases to 2406℃ during torch test and the average mass loss is -0.14%, linear ablation rate is
-1×10-3mm/s. For Csf/ZrB2-SiC, the maximum surface temperature is 1883℃, and the average mass loss is -0.19%, linear ablation rate is -4×10-4mm/s. From the surface and cross section analysis it is found that loosen ZrO2 oxidation layer, SiC rich layer and unaltered layer form from outer layer to inner layer in ablated ZrB2-SiC microstructure, where SiC rich layer has oxidation resistance. For Csf/ZrB2-SiC, ZrO2-SiO2 oxidation layer, SiC depletion layer and unaltered layer distribute from outer layer to inner layer, where the SiO2 filled ZrO2 oxidation layer formed in the surface can prevent
oxygen effectively.
参考文献
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