Adhesion measurement of highly-ordered TiO2 nanotubes on Ti-6Al-4V alloy
2017
Self-assembled nanotubular arrays on Ti alloys could be used for more
effective implantable devices in various medical approaches. In the present
work, the adhesion of TiO2 nanotubes (TiO2 NTs) on Ti-6Al-4V (Ti64) was
investigated by laser spallation and scratch test techniques. At first,
electrochemical anodization was performed in an ammonium fluoride solution
dissolved in a 90:10 ethane-1,2-diol (ethylene glycol) and water solvent
mixture. This process was performed at room temperature (23°C) at a steady
potential of 60 V for 1 h. Next, the TiO2 nanotubes layer was heat-treated to
improve the adhesion of the coating. The formation of selforganized TiO2
nanotubes as well as the microstructural evolution, are strongly dependent on
the processing parameters and subsequent annealing. From microscopic
analysis, highly oriented arrays of TiO2 nanotubes were grown by thermal
treatment for 90min at 500°C. Further heat treatment above 500°C led to the
detachment of the nanotubes and the complete destruction of the nanotubes
occurred at temperature above 700°C. Scratch test analysis over a constant
scratch length (1000 μm) indicated that the failure point was shifted from
247.4 to 557.9 μm while the adhesion strength was increased from ~862 to
~1814mN after annealing at 500°C. The adhesion measurement determined by
laser spallation technique provided an intrinsic adhesion strength of 51.4MPa
for the TiO2 nanotubes on the Ti64 substrate.
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