The cyclic ablation behavior of C/C-ZrC-SiC-ZrB₂ composites was investigated following 30s×4 and 60s×2 cycles at the heat fluxes of 2.38 and 4.18 MW/m², respectively. At the two heat fluxes, the surface temperature of cyclic ablation of 30s×4 was lower than that of 60s×2. Microstructure characterization indicated that the center and transition region consisted of a layered structure of the outer ZrO₂ layer with the subsurface ZrO₂-SiO₂ layer. The depletion of SiO₂ was decreased in the sub layer and the grain size of ZrO₂ in the sub layer was smaller than that of ZrO₂ in the outer layer.

中文翻译：

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C / C-ZrC-SiC-ZrB ₂复合材料在氧乙炔焊炬下在高于2000ºC的温度下有两个热通量时的循环烧蚀行为

研究了C / C-ZrC-SiC-ZrB ₂复合材料在30s×4和60s×2循环后在2.38和4.18 MW / m ²的热通量下的循环烧蚀行为。在两个热通量下，循环烧蚀的表面温度为30s×4低于60s×2。显微组织表征表明，中心和过渡区由外ZrO ₂层和表面下ZrO ₂ -SiO ₂层的层状结构组成。子层中的SiO ₂消耗减少，并且子层中的ZrO ₂的晶粒尺寸小于外层中的ZrO ₂的晶粒尺寸。