• Sukiman, Nazatul
• Ramirez, Brian
• Basirun, Wan
• Kasim, Noor
• Gupta, Vijay
• Razak, Abdul
• Sarraf, Masoud
• Crum, Ryan
• Gámez, Carlos

Abstract

<jats:p>Self-assembled nanotubular arrays on Ti alloys could be used for moreeffective implantable devices in various medical approaches. In the presentwork, the adhesion of TiO2 nanotubes (TiO2 NTs) on Ti-6Al-4V (Ti64) wasinvestigated by laser spallation and scratch test techniques. At first,electrochemical anodization was performed in an ammonium fluoride solutiondissolved in a 90:10 ethane-1,2-diol (ethylene glycol) and water solventmixture. This process was performed at room temperature (23?C) at a steadypotential of 60 V for 1 h. Next, the TiO2 nanotubes layer was heat-treated toimprove the adhesion of the coating. The formation of selforganized TiO2nanotubes as well as the microstructural evolution, are strongly dependent onthe processing parameters and subsequent annealing. From microscopicanalysis, highly oriented arrays of TiO2 nanotubes were grown by thermaltreatment for 90min at 500?C. Further heat treatment above 500?C led to thedetachment of the nanotubes and the complete destruction of the nanotubesoccurred at temperature above 700?C. Scratch test analysis over a constantscratch length (1000 ?m) indicated that the failure point was shifted from247.4 to 557.9 ?m while the adhesion strength was increased from ~862 to~1814mN after annealing at 500?C. The adhesion measurement determined bylaser spallation technique provided an intrinsic adhesion strength of 51.4MPafor the TiO2 nanotubes on the Ti64 substrate.</jats:p>

Topics

• nanotube
• strength
• annealing