中文摘要：

先锋渗入和热分解过程准备的 C/C-HfC-SiC composites 被氧乙决的火炬在二个不同火焰条件下面切除。composites 的脱离表演为 60  s 在 2.38  MW/m ²(HF-L ) 和 4.18  MW/m ²(HF-H ) 的热流动被调查。在 4.18  MW/m ²(HF-H ) 的机械剥光在 2.38  MW/m ²(HF-L ) 比那高，当结果显示 composites 在二个不同火焰条件下面有一个类似、好的脱离性质时。C/C-HfC-SiC composites 能从 2.38  MW/m ² 使热流动适应 4.18  MW/m ² 。HfO ₂ 没在 2.38  MW/m ²(HF-L ) 的热流动完全被融化。那么， HfO ₂ 和 SiO ₂ 层充当了对热和氧化气体的转移的一个有效障碍进内在的碳底层。SiO ₂ 严重地在 4.18  MW/m ²(HF-H ) 被消费，在的地方熔融的层玩了的 HfO ₂ 在保护的一个更重要的角色内部合成。

英文摘要：

C/C-HfC-SiC composites prepared by precursor infiltration and pyrolysis process were ablated by oxyacetylene torch under two different flame conditions. The ablation performance of the composites was investigated in the heat flux of 2.38 MW/m2 （HF-L） and 4.18 MW/m2 （HF-H） for 60 s. The mechanical denudation in 4.18 MW/m2 （HF-H） was higher than that in 2.38 MW/m2 （HF-L）, while the results indicated that the composites had a similar and good ablation property under two different flame conditions. C/C- HfC-SiC composites can adapt the heat flux from 2.38 MW/m2 to 4.18 MW/m2. The Hf02 was not melted completely in the heat flux of 2.38 MW/m2 （HF-L）. So, both Hf02 and Si02 layers acted as an effective barrier to the transfer of heat and oxidative gases into the underlying carbon substrate. SiO2 was severely consumed in 4.18 MW/m2 （HF-H）, where the HfO2 molten layer played a more important role in protecting the inner composite.