VERDON, Claire; SZWEDEK, Olivier; ALLEMAND, Alexandre; JACQUES, Sylvain; LE PETITCORPS, Yann; DAVID, P.

doi:10.1016/j.jeurceramsoc.2013.10.019

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VERDON, Claire
Laboratoire des Composites Thermostructuraux [LCTS]

SZWEDEK, Olivier
Laboratoire des Composites Thermostructuraux [LCTS]

ALLEMAND, Alexandre
Laboratoire des Composites Thermostructuraux [LCTS]

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Ce document a été publié dans

Journal of the European Ceramic Society. 2014-04-01, vol. 34, n° 4, p. 879-887

Résumé en anglais

The difficulty in using above 2000°C in an oxidizing atmosphere C/C composites as structural components is their poor life time. The solution proposed here consisted in combining two refractory carbides, hafnium and silicon carbides, in coating with a complex architecture, named a three dimensional coating, over a C/C substrate. Such a coating protects the C/C composite at 2050°C under air. The oxidation of the coating leads to the formation of a Si x O y Hf z hafnium-containing silicate liquid, combined with HfO 2(s). This liquid limits oxygen diffusion more than pure SiO 2 does, so it is a better protection against oxidation. Furthermore, HfO 2(s) acts as a grip holding Si x O y Hf z in place. From these results, an oxidation mechanism is proposed and discussed.< Réduire

Mots clés en anglais

UHTC

oxidation

carbides

refractories

Hafnium