An experimental study was conducted to study the effects of chemical vapor deposition (CVD) carbon content on the erosion behavior of 5 direction (5D) carbon-carbon (C/C) composite in a solid rocket motor (SRM). A small SRM, which can compare the erosion performance of two samples under the same working conditions, was designed and tested. The erosion of the carbon-carbon composite ablative morphology at macroscale and microscale was obtained and analyzed. Results show that the average erosion rates of 1# and 2# samples are 0.35 mm/s and 0.45 mm/s, respectively, which means the erosion rate of the sample with high CVD carbon content is 22.2% times lower than the one with low CVD carbon content. During SRM operation, the fibers within fiber bundles and carbon rods are in a dispersive and integral state, respectively, thus carbon rods have a better anti-ablation capability, followed by fiber bundles and matrix in turn. As a result, a carbon rod will be positioned higher than the matrix and fiber bundles around. Furthermore, the ablation of fibers within fiber bundles and carbon rods, although they have significant differences in the ablation process, can both be described as a single fiber ablation. The oxidizing species react with the matrix, then with the CVD carbon and the fiber within a fiber bundle in turn, while they react with the matrix, the CVD carbon and the fiber within a carbon rod simultaneously. This shows that the increase in CVD carbon content will improve the ablation performance of C/C composite by protecting the fibers within the fiber bundles. The present study provides a fundamental understanding of the effect of CVD carbon on the ablation performance of C/C composite, serving as a reference for further design and optimizations of C/C composite.

进行了一项实验研究，以研究化学气相沉积（CVD）碳含量对固体火箭发动机（SRM）中5向（5D）碳-碳（C / C）复合材料的腐蚀行为的影响。设计并测试了一个小型SRM，它可以比较两个样品在相同工作条件下的腐蚀性能。获得并分析了碳-碳复合材料烧蚀形态的宏观和微观侵蚀。结果表明，1＃和2＃样品的平均腐蚀速率分别为0.35 mm / s和0.45 mm / s，这意味着高CVD碳含量的样品的腐蚀速率比低＃2样品的腐蚀速率低22.2％倍。 CVD碳含量。在SRM操作期间，纤维束和碳棒中的纤维分别处于分散状态和整体状态，因此碳棒具有更好的抗烧蚀能力，其次是纤维束和基质。结果，碳棒的位置将高于基体和周围的纤维束。此外，尽管纤维束和碳棒中的纤维在烧蚀过程中具有显着差异，但它们的烧蚀都可以描述为单纤维烧蚀。氧化物质与基质反应，然后依次与CVD碳和纤维束内的纤维反应，而它们同时与基质，CVD碳和碳棒内的纤维反应。这表明，通过保护纤维束中的纤维，CVD碳含量的增加将改善C / C复合材料的烧蚀性能。