Abstract The B-modified SiC/HfC-SiC composites were prepared by the combination of precursor infiltration and pyrolysis (PIP) and chemical vapor deposition (CVD) methods. The microstructure, cyclic ablation and bending strength tests of the SiC/HfC-SiC composites with and without B were investigated. The results showed that the B-modified composites had a better cyclic ablation resistance than that of the composites without B. The effective residual thickness of the B-modified composites was also higher than that of the composites without B after cyclic ablation. The residual bending strength of the B-modified composites was slightly lower than that of the composites without B.

中文翻译：

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B-改性SiC/HfC-SiC复合材料在循环烧蚀环境下的烧蚀行为和力学性能

摘要 采用前驱体渗透热解（PIP）和化学气相沉积（CVD）法相结合制备了硼改性的SiC/HfC-SiC复合材料。研究了含 B 和不含 B 的 SiC/HfC-SiC 复合材料的微观结构、循环烧蚀和弯曲强度测试。结果表明，B改性复合材料比不含B的复合材料具有更好的抗循环烧蚀性能。循环烧蚀后，B改性复合材料的有效残余厚度也高于不含B的复合材料。B改性复合材料的残余弯曲强度略低于不含B的复合材料。