Abstract
Abstract New metastable β-type Ti alloys for biomedical applications containing biocompatible alloying elements such as Nb can present remarkable mechanical behavior. Whenever the performance of an implant produced from β-type Ti alloys is considered, it is crucial to take into account their surface properties because they are intimately associated with osseo-integration. The osseo-integration of orthopedic implant devices made from CP–Ti to β-type Ti alloys depends directly on the properties of the oxide layer formed on their surface. The aim of this study was to investigate the formation of self-organized TiO 2 nanotubes by an anodization process on CP–Ti and Ti–35Nb and Ti–35Nb–4Sn alloys (wt.%) and analyze the effects of Nb and Sn additions to CP–Ti on the amorphous–anatase and anatase–rutile phase transformations in TiO 2 nanotubes using glazing-angle high-temperature X-ray diffraction. The results obtained suggest that the crystallization of TiO 2 formed on CP-Ti occurs at 225 °C, whereas the anatase–rutile transition occurs at 400 °C. As Nb was added to Ti, the temperatures at which these phase transformations occur increased. When Sn was added to Ti–35Nb alloy, the kinetics of the phase transformations appeared to decrease.
Published Version
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