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为了研究轴棒法编织的高密度碳/碳(C/C复合材料在再入飞行时的烧蚀性能,采用热等离子体地面模拟再入烧蚀系统对C/C复合材料进行烧蚀试验。试验中分别采用氮气(N、氧气(O和空气作为工作气体,对比研究C/C复合材料在不同环境中的烧蚀率和烧蚀性能。结果表明,三种情况下试样的烧蚀率和微观形貌有很大差异;纯氧气时氧化反应的线烧蚀率和质量烧蚀率分别为0.0423mm/s和0.0451g/s大于纯氮气时氮化反应的0.0314mm/s和0.0338g/s也大于空气成分时复合反应的0.0215mm/s和0.0208g/s在试样烧蚀的热影响区发生轻微开裂;三种工况下的烧蚀机理不同,分别是碳的升华、碳的氧化和碳氮反应的某种组合。
In order to study the high density C / C braided carbon rod with axial rod method (ablation performance of C / C composite during reentry flight, the ablation test of C / C composites was carried out by hot plasma ground reentrant ablation system. In the experiment, nitrogen (N, O 2, O 2 and air respectively) were used as working gases to compare the ablation and ablation performances of C / C composites in different environments.The results show that the ablation rate And the morphology were very different. The linear ablation rate and mass ablation rate of pure oxygen at the time of pure oxygen were 0.0423mm / s and 0.0451g / s, respectively, which were larger than that of pure nitrogen at 0.0314mm / s and 0.0338g / s is also greater than the air component of the composite reaction of 0.0215mm / s and 0.0208g / s slight ablation in the sample heat affected zone ablation; ablation under three different operating mechanism are sublimation of carbon, carbon Some combination of oxidation and carbonitriding reactions.