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Título:
FABRICATION AND CHARACTERIZATION OF TiO2 FILMS ON Ti-6Al-4V BY ANODIC OXIDATION
Autor/es:
M. L. VERA; A. E. ARES; M. R. ROSENBERGER; D. G. LAMAS; C. E. SCHVEZOV
Lugar:
Seattle, WA, USA
Reunión:
Congreso; TMS 2010 139th ANNUAL MEETING AND EXHIBITION; 2010
Institución organizadora:
The Minerals, Metals & Materials Society (TMS)
Resumen:
Titanium and titanium alloys are widely used in a variety of biomedical applications due to their corrosion resistance and biocompatibility. A protective passive titanium dioxide film covers the surface of the Ti and its alloys in ambient conditions. This natural oxide is 2 to 7 nm thick, and it is one of the principal responsible for the success as an implant material. TiO2 films can be produced on Ti-6Al-4V substrates by several techniques  like, thermal oxidation,  anodic oxidation, sol-gel process, etc. In this study, TiO2 films were produced on Ti-6Al-4V substrates by anodic oxidation technique, using 1M H2SO4 solution as electrolyte at different voltages (from 10V to 100V) during 1 min. The microstructure, phase structure and phase composition of films produced under different voltages were determined by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) operated with glancing angle geometry with an angle of incidence of 1°. Different colours of interference were obtained depending on the applied voltage and they are according to those mentioned in the literature.  The oxide layers produced on Ti-6Al-4V at low voltages up to 50V are smooth and amorphous. Moreover, there is a selective oxidation of alpha and beta phases of the alloy used as substrate. A spark discharge occurs, at voltages larger than 70V, producing porous and crystalline coatings. Crystalline phases of TiO2, anatase and rutile, were obtained at high voltage. Each of these morphologies and structures of the coatings are suitable to different biomedical applications and devices.