Esfahani, EA, Bukuaghangin, O, Banfield, S et al. (5 more authors) (2022) Surface engineering of wrought and additive layer manufactured Ti-6Al-4V alloy for enhanced load bearing and bio-tribocorrosion applications. Surface and Coatings Technology, 442. 128139. ISSN 0257-8972
Abstract
The beneficial effect of surface engineering on the wear and corrosion performance of Ti-6Al-4V alloy for biomedical purposes has recently gained a lot of interest. To date, researchers have shown TiN ceramic coatings to be an effective strategy to improve the poor tribocorrosion properties of Ti-based alloys. However, coating degradation and adhesions remains a major hurdle to overcome for successful clinical translation. Recently, a duplex TPON + TiN treatment process on Ti-alloy has been suggested for applications involving with high contact loads. For the first time, this technique was extended to the Additive Layer Manufactured (ALM) Ti-6Al-4V alloys in an attempt to enable load bearing patient personalised implants. The bio-tribology and corrosion resistance of the coated ALM materials were compared with that of the coatings on conventional wrought manufactured alloy for orthopaedic applications. XRD analysis showed that the coatings on both substrates are primarily composed of TiN. The Knoop microhardness technique proved a tribologically effective diffusion layer with a case depth of 35–45 μm. The LC2 and LC3 values were measured above 40 N and 60 N which is an excellent cohesive and adhesive strength for these types of the coatings. Electrochemical measurements in both static and sliding conditions showed a quick recovery capability of the protective layer in 25% Foetal Bovine Serum (FBS) diluted in Phosphate Buffered Saline (PBS) electrolyte. The static electrochemical measurements also showed reduced corrosion current densities when compared to that of the bulk Ti-alloy. Coating on both substrates showed an excellent wear resistance which is correlated to the enhanced load bearing capacity of the coated surfaces. While the coating thickness was 3–6 μm, the wear depth was only 0.3 μm after 2 h of reciprocating sliding wear test.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Elsevier B.V. All rights reserved. This is an author produced version of an article published in Surface and Coatings Technology. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds) |
Funding Information: | Funder Grant number Innovate UK fka Technology Strategy Board (TSB) TS/P003273/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Feb 2022 12:35 |
Last Modified: | 21 Jan 2023 01:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.surfcoat.2022.128139 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:182893 |