Abstract
The oxidation of vanadium by CO 2CO mixtures ( 0.25 < P CO 2 P CO < 9 ) in thé température range 1025–1225°C leads simultaneously to the growth of a thin external layer of V 2O 3 above a thick VO scale and to the dissolution of oxygen in the metal. This dissolution, which is particularly significant at the beginning of the reaction ( α < 0.2), is associated with the formation of the α, α' (or V 9O) and β phases. The parabolic kinetics are controlled by a mainly cationic diffusion process ( E = 49 ± 5 kcal mol −1) where the VO phase plays a preponderant role. These results are very close to those obtained in the presence of water vapour in similar thermodynamic conditions, which imply the existence of the oxide V 2O 3 at the outer interface.
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