Anodization behaviour of high pressure torsion processed Titanium

Hu, Nan, Starink, M.J. and Gao, Nong (2014) Anodization behaviour of high pressure torsion processed Titanium. Nanomaterials by Severe Plastic Deformation 6. 29 Jun - 03 Jul 2014.

Record type: Conference or Workshop Item (Paper)

Abstract

Titanium and its alloys are widely used for fabricating biomedical implants. In this project, high pressure torsion (HPT) and anodization are used to simultaneously improve the bulk and surface properties of Ti. A self-aligned TiO2 nanotubes (TNT) layer, which is very promising in improving biocompatibility of Ti implants, can be produced through anodization. However, UFG Ti has been reported to have different electrochemical behaviours. The special microstructure of UFG substrates, including high dislocation density and fine grain size, may influence the anodization behaviours of the substrate. Therefore, this project aims to investigate the anodization behaviours and the resulting of TNT layers on of SPD-processed Ti. After 10 turns of HPT processing, the grains were refined from 13 µm to 140 nm, and the hardness increased from 177 to 287 HV. TNT were fabricated through a two-stage anodization (30v/6h+30v/16h) on HPT and as-received CP Ti. The results indicate that TNT grown on HPT samples are longer, larger in bottom diameter, have a more complicated top morphology and is more hydrophilic than TNT on as-received CP Ti

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