Abstract
Since different properties of coating systems influence their friction and wear at different length scales contact size can play a critical role in microtribological experiments. In this study the behaviour of 3 different types of coating system which vary in terms of their thickness, substrate and mechanical properties has been investigated. The coatings were chosen for either their industrial relevance in automotive or MEMS applications, or as model coating systems. A wide range of nano/microtribological tests have been performed with different indenter geometries (tip sharpness), including single and repetitive scratch tests with unidirectional contact, and reciprocating wear tests, with depth and friction evolution monitored so that the relationships between failure mechanism and friction in coating systems with differing mechanical properties could be explored. The influence of surface topography on friction has been shown in ramped and constant load scratch tests. When fracture occurred resulting in a sudden increase in probe depth there was an abrupt decrease in friction which is ascribed to a contact area effect. In contrast, where deformation progressed through micro-wear a more gradual increase in depth can be associated with higher contact area and higher friction.
| Original language | English |
|---|---|
| Article number | 100248 |
| Number of pages | 19 |
| Journal | Applied Surface Science Advances |
| Volume | 9 |
| Early online date | 13 Apr 2022 |
| DOIs | |
| Publication status | Published - Jun 2022 |
Bibliographical note
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/),which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
Keywords
- Nanotribology
- Topography
- Scratch
- Wear
- Microtribology