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The influence of surface roughness and high pressure torsion on the growth of anodic titania nanotubes on pure titanium

The influence of surface roughness and high pressure torsion on the growth of anodic titania nanotubes on pure titanium
The influence of surface roughness and high pressure torsion on the growth of anodic titania nanotubes on pure titanium
Anodic titanium dioxide nanotube (TNT) arrays have wide applications in photocatalytic, catalysis, electronics, solar cells and biomedical implants. When TNT coatings are combined with severe plastic deformation (SPD), metal processing techniques which efficiently improve the strength of metals, a new generation of biomedical implant is made possible with both improved bulk and surface properties. This work investigated the effect of processing by high pressure torsion (HPT) and different mechanical preparations on the substrate and subsequently on the morphology of TNT layers. HPT processing was applied to refine the grain size of commercially pure titanium samples and substantially improved their strength and hardness. Subsequent anodization at 30 V in 0.25 wt. % NH4F for 2 hours to form TNT layers on sample surfaces prepared with different mechanical preparation methods was carried out. It appeared that the local roughness of the titanium surface on a microscopic level affected the TNT morphology more than the macroscopic surface roughness. For HPT-processed sample, the substrate has to be pre-treated by a mechanical preparation finer than 4000 grit for HPT to have a significant influence on TNTs. During the formation of TNT layers the oxide dissolution rate was increased for the ultrafine-grained microstructure formed due to HPT processing.
0169-4332
1010-1020
Hu, Nan
a9626677-cea5-48c7-9a7f-d3bc4116b9d5
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Hu, Nan
a9626677-cea5-48c7-9a7f-d3bc4116b9d5
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51

Hu, Nan, Gao, Nong and Starink, Marco J. (2016) The influence of surface roughness and high pressure torsion on the growth of anodic titania nanotubes on pure titanium. Applied Surface Science, 387, 1010-1020. (doi:10.1016/j.apsusc.2016.07.036).

Record type: Article

Abstract

Anodic titanium dioxide nanotube (TNT) arrays have wide applications in photocatalytic, catalysis, electronics, solar cells and biomedical implants. When TNT coatings are combined with severe plastic deformation (SPD), metal processing techniques which efficiently improve the strength of metals, a new generation of biomedical implant is made possible with both improved bulk and surface properties. This work investigated the effect of processing by high pressure torsion (HPT) and different mechanical preparations on the substrate and subsequently on the morphology of TNT layers. HPT processing was applied to refine the grain size of commercially pure titanium samples and substantially improved their strength and hardness. Subsequent anodization at 30 V in 0.25 wt. % NH4F for 2 hours to form TNT layers on sample surfaces prepared with different mechanical preparation methods was carried out. It appeared that the local roughness of the titanium surface on a microscopic level affected the TNT morphology more than the macroscopic surface roughness. For HPT-processed sample, the substrate has to be pre-treated by a mechanical preparation finer than 4000 grit for HPT to have a significant influence on TNTs. During the formation of TNT layers the oxide dissolution rate was increased for the ultrafine-grained microstructure formed due to HPT processing.

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Accepted/In Press date: 4 July 2016
e-pub ahead of print date: 5 July 2016
Published date: 30 November 2016
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 397754
URI: http://eprints.soton.ac.uk/id/eprint/397754
ISSN: 0169-4332
PURE UUID: b60281dc-7418-40f1-b18d-cdaddca5e750
ORCID for Nong Gao: ORCID iD orcid.org/0000-0002-7430-0319

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Date deposited: 06 Jul 2016 09:09
Last modified: 15 Mar 2024 05:43

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Contributors

Author: Nan Hu
Author: Nong Gao ORCID iD

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