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主要研究炭/炭(C/C)复合材料在高温使用环境下的烧蚀、剩余强度以及热物理性能。实验采用四维C/C复合材料,在3000℃下进行重复氧-乙炔烧蚀实验,每次烧蚀时间为30s,烧蚀后快速冷却。结果表明:材料的烧蚀率与烧蚀时间呈线性关系;在总烧蚀时间相同的情况下,单步烧蚀比逐步烧蚀的烧蚀率高。经过最初几步烧蚀实验后,材料的烧蚀率保持恒定。试样烧蚀面的粗糙度对试样的烧蚀率有重要影响。随着烧蚀次数的增加,材料的压缩强度、热导率和热膨胀系数逐步降低,而比热容几乎保持不变。
The main research carbon / carbon (C / C) composite materials in the high temperature environment of ablation, residual strength and thermal physical properties. Experiments using four-dimensional C / C composite materials, repeated oxygen-acetylene ablative test at 3000 ℃, each ablation time is 30s, after ablation rapid cooling. The results show that there is a linear relationship between the ablation rate and the ablation time. The ablation rate of ablation step ablation is higher than that of ablation ablation for the same total ablation time. After the first few ablation experiments, the material ablation rate remains constant. The roughness of the ablated surface of the sample has an important influence on the ablation rate of the sample. With the increase of the number of ablation, the compressive strength, thermal conductivity and thermal expansion coefficient of the material gradually decreased, while the specific heat capacity remained almost unchanged.