NDLI: Film/Substrate Adhesion Assessment by Scratch Tests Performed With Different Indenters

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Houérou, Vincent Le Jacomine, Leandro Gauthier, Christian
Copyright Year	2014
Abstract	In most cases, scratching of the surface of a polymeric glass elicits brittle behavior and industrial solutions like coating have been successfully used to improve the scratch resistance. The origin of the success of the coating technique is still of great research interest since one of the limitations of this technique is the risk of cracking and chipping. In terms of interfacial adhesion characterization, a wide variety of methods have been used to assess this property of material systems. Nevertheless, the adhesion of coatings still remains to be successfully determined in a test which can reproduce the damage undergone by the coated surface during its real lifetime. In this context, scratch test constitutes a good candidate. The present study deals with the scratching technique as an interfacial adhesion measurement in coated systems. Using a single-asperity scratching device allowing in-situ observation of the scratch, the fracture of a thin nano-composite coating deposited on its substrate was investigated under different conditions of temperature and scratching speed. Four types of fracture kinetics were observed depending on these two variables. One of these exhibits a stable blister growth at the same speed as the movement of the indenter over hundreds micrometers. This slow and extensive growth of a blister was obtained at 80 °C at a scratching speed of 10 μm/s. When the blister has reached a certain size, it propagates with the indenter without increasing further in size: it constitutes the steady state blister growth. A variational form of the energy balance of a blistering process is proposed, which permits to assess the adhesion of the system. Actually, the energy spent in the delamination process can be determined by following the delaminated area during the blistering process with regard to the scratching distance. The main difficulty is to estimate the energy dissipated in plastic flow. Different tests were conducted with various indenters: spheres with different radius and roughness. Thanks to this multi-criterion approach, it was possible to fit a unique value of the adhesion in the case of experimental stable blistering growths. The results are discussed with regard to reliability and probe characteristics.
Sponsorship	International
File Format	PDF
ISBN	9780791845851
DOI	10.1115/ESDA2014-20121
Volume Number	Volume 3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics
Conference Proceedings	ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis
Language	English
Publisher Date	2014-07-25
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Temperature Deformation Glass Risk Surface roughness Coatings Brittleness Adhesion Steady state Energy budget (physics) Fracture (process) Nanocomposites Materials properties Damage Reliability Delamination Probes
Content Type	Text
Resource Type	Article

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