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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v10.i4.130
pages 625-636

CATALYCITY OF SPACE SHUTTLE MATERIAL: INFLUENCE OF METALLIC POLLUANTS ON THEIR AGEING AND DETERMINATION OF THEIR REGENERATION

L. Benabdelmoumene
Laboratoire de Génie des Procédés Plasmas et Traitement de Surfaces, 11 rue Pierre et Marie Curie, 75231 Paris Cedex, France
C. Guyon
Laboratoire de Génie des Procédés Plasmas et Traitement de Surfaces, Universite Pierre & Marie Curie, 11 rue Pierre et Marie Curie, 75231 Paris Cedex, France
S. Cavadias
Laboratoire Genie Precedes Plasmas - ENSCP 11, rue Pierre et Marie Curie - 75005 Paris- France
Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

RÉSUMÉ

The heating of a spacecraft during the reentry phase, leads to the oxidation of the surface causing a loss of catalycity properties of the material. The aim of this work is the study of the ageing of the materials (SiC) and the change of its catalycity [1]. The heating due to the transfer of the kinetic energy from the plasma is created in the nozzle of the spacecraft. Oxygen atoms created from this plasma recombine on the surface leading to an additional increase of the temperature from 373 K to 773 K depending on the catalycity of the thermal protection material and its partial degradation. The heat transfer on materials depends on the recombination coefficient (γ) [2] of the oxygen atoms and the accommodation coefficient (β) [3]. The diffusion of oxygen in the bulk increases the porosity, while new surface layer of oxides such as SiO2 are formed and replaced the SiC surface of the matrix. This oxide which is formed by the recombination of atomic oxygen on the surface leads to a change of the γ coefficient. The propagation of the defects in the lattice, with formation of microcracks, metallic oxides, and the diffusion of impurities modifies the composition of the surface and the material properties. Our interest was focused on the study of the pollution-regeneration of silicon carbide. However it is possible to retrieve the original catalycity properties of SiC by applying a thin layer of silica. Moreover the association of chromium with silica layer can notably improve these properties.


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