Abstract
Oxide films obtained during anodization of Ti‒40% Al sintered powder samples in fluorine-containing electrolytes are investigated. With scanning electron microscopy and X-ray phase analysis, it is demonstrated that an X-ray amorphous nanoporous anodic oxide film is formed on the surface of the powder microparticles under optimal anodization conditions. After annealing at T = 1093 K in air and vacuum (10‒2 Pa), the oxide films are revealed to crystallize with its regular porous structure retained. The composition of the polycrystalline anodic-oxide films annealed in air is a mixture involving TiO2 (anatase and rutile) and α- and γ-Al2O3 phases and Ti2O3 and Al2TiO5 traces. The vacuum annealing process makes it possible to identify TiO2, in which anatase is the main phase, α- and γ-Al2O3, and Ti2O3 and TiO traces. However, rutile is not revealed. The presented results indicate that the application of the anodic nanostructuring of Ti‒40% Al powders is promising for the obtainment of new photocatalytic active nanomaterials.
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Original Russian Text © K.V. Stepanova, N.M. Yakovleva, A.N. Kokatev, H. Pettersson, 2016, published in Poverkhnost’, 2016, No. 9, pp. 54–62.
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Stepanova, K.V., Yakovleva, N.M., Kokatev, A.N. et al. Influence of annealing on the structure of nanoporous oxide films on the surface of titanium‒aluminum powder alloy. J. Surf. Investig. 10, 933–941 (2016). https://doi.org/10.1134/S102745101605013X
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DOI: https://doi.org/10.1134/S102745101605013X