Oxidation kinetics of a Ni-Cu based cermet at high temperature

Abstract : The oxidation kinetics of a cermet composed of Ni-Cu alloy and nickel ferrite was studied by thermogravimetry at 960 °C under oxygen in the range 0.5-77 kPa. After an initial mass increase up to 15 g/m2 due to oxidation of surface metallic particles, the mass change was attributed to both outwards NiO growth and internal oxidation. Above 40 g/m2, the NiO scale thickness remained constant and the oxidation kinetics followed a complete parabolic law. The variations of the kinetic rate with oxygen partial pressure allowed to propose mechanisms, rate-controlling steps and kinetic laws in both transient and long term oxidation periods.
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Christophe Honvault, Véronique Peres, Laurent Cassayre, Pierre Chamelot, Patrice Palau, et al.. Oxidation kinetics of a Ni-Cu based cermet at high temperature. Corrosion Science, Elsevier, 2013, 68, pp.154-161. ⟨10.1016/j.corsci.2012.11.007⟩. ⟨hal-00772778⟩

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