Microstructure and gas-surface interaction studies of a 3D carbon/carbon composite in atmospheric entry plasma

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• 作者：C. Levet^a ; ^b ; B. Helber^c ; J. Couzi^b ; J. Mathiaud^b ; J.-B. Gouriet^c ; O. Chazot^c ; G.L. Vignoles^a ; ^{vinhola@lcts.u-bordeaux.fr}
• 刊名：Carbon
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：114
• 期：Complete
• 页码：84-97
• 全文大小：5067 K
• 卷排序：114

文摘

3D Carbon-fiber reinforced carbon composites (3D Cf/CCf/C) are widely used as thermostructural protections in various applications. Among them, thermal protection systems for atmospheric re-entry encounter one of the most aggressive environments, where 3D Cf/CCf/C are exposed to strong ablation. Because flight tests are extremely expensive, Inductively Coupled Plasma torch is a good compromise to understand the behaviour of this material under ablative conditions. The Plasmatron of the von Karman Institute for Fluid Dynamics is used in this study, coupled with a numerical rebuilding of the flow. Air and argon flows are used on flat and hemispherical 3D Cf/CCf/C samples leading to surface temperatures ranging from 1800° C to 2500° C. In-situ measurements are performed coupled with SEM micrography and 3D pictures from digital optical microscopy in order to understand the epi-macro-structural and the epi-micro-structural roughness of the composite. The internal structure of the composite was revealed by the differences in ablation resistance between constituents. It is found that the flow field has a major contribution to the composite macroscopic and mesoscopic roughness and recession velocity.