Oxidation kinetics and mechanism of a zirconia based composite dispersed with 304L particles

Jinane Tarabay (1, 2, 3) , Véronique Peres (1, 2, 3) , Michèle Pijolat (1, 2, 3)

1 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 LGF-ENSMSE - Laboratoire Georges Friedel

The oxidation at 800 °C of 304L particles dispersed in a zirconia ceramic showed behaviour different from that usually observed for 304L. SEM observations revealed inward growth of Cr₂O₃ nodules and outward growth of an iron-rich (Fe, Cr) mixed oxide scale. The method of jumps indicated first that a rate-determining step was controlling the kinetics, then that oxidation was favoured by an increase of the oxygen partial pressure. Growth mechanisms of both types of oxides were proposed; the Fe–Cr mixed oxide growth accounted for the major part of the mass gain and was controlled by the diffusion of metal vacancies obeying a law.

Mots clés: Oxidation; Kinetics; 304L stainless steel; Ceramic matrix composite; Thermogravimetry

Domaines: Génie des procédés

Jinane Tarabay, Véronique Peres, Michèle Pijolat. Oxidation kinetics and mechanism of a zirconia based composite dispersed with 304L particles. Corrosion Science, 2016, 102, pp.16-23. ⟨10.1016/j.corsci.2015.08.042⟩. ⟨hal-01194754⟩