An oxyacetylene torch tested the ablation of SiC/SiC composites at 1800℃. According to the distribution of ablation product silica, the morphology could be divided into three regions. The fibers in the oval central region were ablated and broken, and the fracture surface is the conical tip. The silica liquid film in the transition region plays a role in resisting the ablation of the material. However, the generation of airflow channels destroys the liquid film's continuity and reduces the material's ablation resistance. Bean sprouts-like nano-sized silica was grown on the surface of the dome-top SiC matrix in the marginal region.

中文翻译：

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1800°C氧乙炔炬烧蚀SiC/SiC复合材料的形貌和微观结构

氧乙炔炬在1800℃下测试了SiC/SiC复合材料的烧蚀。根据烧蚀产物二氧化硅的分布，形态可分为三个区域。椭圆中心区的纤维被烧蚀断裂，断口为锥形尖端。过渡区的二氧化硅液膜起到抵抗材料烧蚀的作用。然而，气流通道的产生破坏了液膜的连续性，降低了材料的烧蚀阻力。豆芽状纳米二氧化硅生长在边缘区域的圆顶碳化硅基体表面。