INVESTIGADORES
ROSENBERGER Mario Roberto
congresos y reuniones científicas
Título:
Fabrication and Characterization of TiO2 Films on Ti-6Al-4V by Anodic Oxidation
Autor/es:
VERA, M.L.; ARES, A.E.; MARIO ROBERTO ROSENBERGER; LAMAS, DIEGO; SCHVEZOV, C. E.
Lugar:
Seatle
Reunión:
Congreso; 139º TMS Annual Meeting & Exhibition. TMS 2010; 2010
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.