Nano Archive

Mechanisms of blistering and chipping of a scratch-resistant coating

Le Houerou, Vincent and Robert, Charles and Gauthier, Christian and Schirrer, Robert (2008) Mechanisms of blistering and chipping of a scratch-resistant coating. WEAR, 265 (3-4). pp. 507-515. ISSN 0043-1648

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Abstract

In most cases, scratching of the surface of a polymeric glass elicits brittle behavior. Industrial solutions have been successfully used to improve the scratch resistance of polymeric glasses and a common way is to coat the substrate with a thin film. However, one of the limitations of this method is the risk of cracking and chipping. The origin of the success of the coating technique is still of great research interest and further work will be required to explain the improvement in scratch resistance and predict the cracking in anti-scratch coatings. The present study contributes to these aims. Using a single-asperity scratching device allowing in situ observation of the scratch, the fracturing of a thin (3.5 mu m) nano-composite coating deposited on a viscoelastic-viscoplastic substrate (polycarbonate) was investigated under different conditions of temperature and scratching speed. Four types of fracture mechanisms were observed, depending on these two variables. The processes involved in deformation of the system were: (i) delamination (blister formation) and fracture (chipping) of the coating and (ii) viscoelastic-viscoplastic deformation of the substrate. Image analyses were performed on video sequences of the different processes leading to damage of the film. The quantitative results are discussed in terms of the damage mechanisms involved. (C) 2008 Published by Elsevier B.V.

Item Type:Article
Uncontrolled Keywords:scratch test; polymers; nano-composite coating; tribology; blister; cracking
Subjects:Engineering > Nanotechnology applications in mechanical engineering
Material Science > Nanostructured materials
ID Code:585
Deposited By:M T V
Deposited On:11 Dec 2008 15:19
Last Modified:11 Dec 2008 15:19

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