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为探索C/C-SiC喷管在固体冲压发动机工作环境下烧蚀行为及重复使用的可行性,对固冲发动机C/CSiC复合材料喷管内层进行研究。研究结果表明:C/C-SiC复合材料喷管能够适应固体冲压发动机富氧、长时间的工作环境;C/C-SiC复合材料喷管收敛段的厚度有所下降,以热化学烧蚀和热机械侵蚀为主;喉部的厚度未发生明显变化,以热化学烧蚀为主;扩张段的厚度未发生变化,只有轻微的氧化。喷管内层的环向弯曲强度和轴向弯曲强度较试验前均有所降低,收敛段下降较多,而扩张段下降较少,但仍能满足重复使用要求;应对试验后喷管内层再进行分区化学气相沉积SiC涂层,提高喉部上游的抗氧化性能,提高其重复使用时的工作可靠性。
In order to explore the ablation behavior and reusability of C / C-SiC nozzle in solid ramjet engine working environment, the inner layer of C / CSiC composite nozzle was studied. The results show that the C / C-SiC composite nozzle can adapt to the oxygen-enriched and long-time working environment of solid ramjet engine. The thickness of the convergent section of C / C-SiC composite nozzle decreases, The main thermal mechanical erosion; throat thickness did not change significantly, mainly to thermochemical ablation; expansion of the thickness of the section did not change, only a slight oxidation. The annular bending strength and axial bending strength of the nozzle inner layer were lower than those before the test, the convergence section decreased more, while the expansion section decreased less, but still meet the repeated use requirements; Partitioning the SiC coating by chemical vapor deposition can improve the oxidation resistance upstream of the throat and improve the reliability of the work when it is reused.