Publication de Thierry Ouisse

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"High-temperature oxidation of bulk single crystal, fine and coarse grained polycrystals of Cr₂AlC has been performed from 800 °C to 1500 °C. In the temperature range T = [800;1400] °C, an α-Al₂O₃ scale with a Cr₇C₃ subscale are in-situ formed independently of the initial microstructure on top of the bulk Cr₂AlC. CALPHAD calculations were performed to explain the formation of Cr₇C₃ instead of the expected mixture of carbides, indicating a favourable driving force for Cr₇C₃ formation. The kinetic study of the oxidation is consistent with previous works with an activation energy of about 400 kJ.mol⁻¹. Oxidizing for a longer time (1000 h) or at higher temperature (1500 °C) leads to the formation of chromia in the former alumina scale, which correspond to the calculated equilibrium phases."