Comportement du titane dans les melanges hydrogene-vapeur d'eau au-dessus de 800°C

The oxidation scale obtained by oxidizing titanium foils in water vapour above 800°C is mainly composed of porous rutile. As the reaction proceeds, a solid solution of Tiα precipitates leading to an intermediate suboxide scale of variable composition TiO_x. In connection with the microstructural study, it can be concluded that the rutile scale grows at the inner interface $\text{TiO}{}_2\text{TiO}{}_{\mathrm{x}}$ thus excluding the possibility of a rate-determining diffusion step.