Wear Resistance of Anodic TiO2 Coating Produced on Ti-6Al-4V Alloys

VERA, M.L.; MARIO ROBERTO ROSENBERGER; SCHVEZOV, C. E.; ARES, A.E.

San Diego

Conferencia; TMS 2014 - 143rd ANNUAL MEETING & EXHIBITION; 2014

TMS

As part of the development of a new mechanical heart valve and havingselected a Ti-6Al-4V alloy coated with titanium oxide as the material for its manufacture, the wear resistant of TiO<SUB>2</SUB> thin films obtained by anodic oxidation is evaluated. Anodic oxidation was performed at 20V to 70V in a H<SUB>2</SUB>SO<SUB>4</SUB> 1M electrolyte. The samples were thermally treated at 500oC for 1h, and crystalline phases (anatase and rutile) were obtained. The wear tests were performed in a Ball-on-flat reciprocante machine in a range of loads from 1gf to 4gf and times between 60s and 1200s, using a diamond sphere as counterface. The counterface oscillates at 0.5Hz and 4mm in amplitude. The wear is measured using a profilometer and is calculated as the worn volume. The wear resistance of the coated samples is larger than the substrate, and increases with the thickness and with crystalline coating.