Haneef, M., Evaristo, M., Morina, A. orcid.org/0000-0001-8868-2664 et al. (2 more authors) (2024) New nanoscale multilayer magnetron sputtered Ti-DLC/DLC coatings with improved mechanical properties. Surface and Coatings Technology, 480. 130595. ISSN 0257-8972
Abstract
Two sets of nanoscale multilayer Ti-DLC/DLC coatings, with similar chemical composition but different periods between consecutive layers (0.4 and 5.5 nm), were deposited by non-reactive direct current magnetron sputtering using different rotational speeds of the substrate holder (12 and 1 rpm, respectively) in this work. The results show that the overall Ti content in the coatings varied from ≈ 2.9 to ≈ 8.2 at. % in both cases. Significant fluctuations in the Ti concentration between the middle points of the DLC and Ti-DLC layers were observed for the coatings deposited at 1 rpm. All the coatings deposited were mainly amorphous, presenting a columnar structure and a cauliflower-like granular surface morphology. The sp2/sp3 ratio increased as the concentration of Ti rose. The coatings deposited at 1 rpm demonstrated better mechanical properties (up to 33 % improvement in hardness and up to 25 % improvement in the elastic modulus) when compared to the equivalent coatings deposited at 12 rpm. The multilayer titanium doped coating (deposited at 1 rpm) with 5.9 at. % Ti presented the most significant improvement in mechanical properties when compared to pure DLC and monolayer coatings deposited at 12 rpm. The results confirmed that it is possible to tune the performance of this type of coatings by depositing alternating layers of pure DLC and Ti-doped DLC.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/bync/4.0/). |
Keywords: | DC magnetron sputtering; Monolayer and multilayer coatings; Ti-doped DLC coatings; Mechanical properties; Adhesion; Nanometric period |
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) |
Funding Information: | Funder Grant number EU - European Union 860246 |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 Feb 2024 09:10 |
Last Modified: | 12 Mar 2024 16:30 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.surfcoat.2024.130595 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:209668 |