Bird, A., Yang, L. orcid.org/0000-0003-0935-3921, Wu, G. et al. (1 more author) (2023) Failure mechanisms of diamond like carbon coatings characterised by in situ SEM scratch testing. Wear, 530-531. 205034. ISSN 0043-1648
Abstract
In situ SEM scratch testing of DLC and Si-doped DLC deposited on Si < 100> wafers has been conducted using sharp 1 and 5 μm radii diamond asperities, enabling the stages of deformation and wear of DLC coatings to be evaluated in real time. With increasing load, initial plastic deformation and tensile cracking in the scratch track progresses to the propagation of radial and lateral cracks, and full coating spallation. In situ SEM imaging reveals nucleation of radial cracks in the DLC coating around the front and side of the moving asperity, followed by lateral crack propagation both ahead of, and behind, the asperity contact zone. Post-mortem FIB cross sectioning reveals microcracking and lateral cracks in the silicon substrate below DLC coatings prior to coating spallation. The DLC failure mechanisms are influenced by asperity geometry, with notable DLC coating lift up/delamination events occurring during the smaller 1 μm radius asperity scratch tests. The sharper 1 μm radius asperity required ∼20% of the applied load, and higher contact pressure, to initiate spallation during scratching compared the larger 5 μm asperity, indicating that smaller radii asperities are significantly more likely to cause DLC coating spallation, although the spallations they generate were observed to be, on average, smaller.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 Elsevier B.V. All rights reserved. This is an author produced version of an article published in Wear made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0) in accordance with the publisher's self-archiving policy. |
Keywords: | Diamond like carbon; DLC; In situ scanning electron microscopy; Scratch testing; Failure mechanisms |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Sep 2023 12:52 |
Last Modified: | 07 Jul 2024 00:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.wear.2023.205034 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:203139 |
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