ZUBER, A.; GAUTHIER-BRUNET, V.; ROGER, Jerome; GONZALEZ-JULIAN, J.; OUISSE, T.; DUBOIS, S.

doi:10.1016/j.jeurceramsoc.2023.05.012

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ZUBER, A.
Institut Pprime [UPR 3346] [PPrime [Poitiers]]

GAUTHIER-BRUNET, V.
Institut Pprime [UPR 3346] [PPrime [Poitiers]]

ROGER, Jerome

Laboratoire des Composites Thermostructuraux [LCTS]

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Article de revue

Ce document a été publié dans

Journal of the European Ceramic Society. 2023-09-01, vol. 43, n° 12, p. 5159-5167

Résumé en anglais

Cr2AlC is one of the most interesting MAX phase compositions to operate under aggressive environments up to 1400 °C, but the effect of humidity at high temperatures is still poorly investigated. Cr2AlC high-temperature oxidation tests under controlled humidity are carried out on fined-grained samples for 40 h in the [1000–1400 °C] temperature range and compared to a previous study performed on single-crystals, fine and coarse-grained samples oxidized under dry air. Oxidation products are characterized and mass gain curves are analysed using both cubic and paralinear oxidation models to extract kinetics and characterize gas emission during the oxidation tests. These experimental data are supported by thermodynamic calculations in order to propose a quite complete oxidation mechanism for Cr2AlC.The nature and the arrangement of the oxidation products formed during wet and dry air oxidation tests are similar - a continuous Al2O3 layer and a Cr7C3 sublayer with pores- which demonstrates that the water vapor does not affect significantly the high-temperature oxidation of Cr2AlC. The acceleration of the oxidation process during wet air tests is correlated to the higher partial pressure of gaseous species produced in the presence of humidity which is associated with the chromium carbide’s volatilization in the form of carbon oxide.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/186108

DOI

http://dx.doi.org/10.1016/j.jeurceramsoc.2023.05.012

Projet Européen

Innovative cladding materials for advanced accident-tolerant energy systems

Project ANR

Poitiers Graduate School on physico-chemical properties of INTerfaces for AeRonautic, Energy and Environment - ANR-18-EURE-0010

Unités de recherche

Laboratoire des Composites Thermo Structuraux (LCTS) - UMR 5801