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Article Dans Une Revue Carbon Année : 2017

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

Résumé

3D Carbon-fiber reinforced carbon composites (3D C f /C) are widely used as ther-mostructural protections in various applications. Among them, thermal protection systems for atmospheric re-entry encounter one of the most aggressive environments , where 3D $C_f$/$C$ 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 $C_f$/$C$ 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.

Domaines

Matériaux
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Dates et versions

hal-01761300 , version 1 (08-04-2018)

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Paternité

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C. Levet, B. Helber, J. Couzi, J. Mathiaud, J.-B. Gouriet, et al.. Microstructure and gas-surface interaction studies of a 3D carbon/carbon composite in atmospheric entry plasma. Carbon, 2017, 114, pp.84-97. ⟨10.1016/j.carbon.2016.11.054⟩. ⟨hal-01761300⟩
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