Rupture et délamination de films minces

Abstract : Nanometer to micrometer thin film coatings are extensively used in material science to protect and functionalize surfaces. Coating processes however generally result into residual strains and may induce the propagation of cracks with dramatic consequences on film reliability. We present two experimental models which challenges the usual stability criteria for thin films. For a thin sol-gel layer moderatly adherent to a silicon substrate, we observe fracture propagation in coatings considered stable. Moreover, intriguing cracks of regular geometry are found to self-replicate an initial triggering pattern independently from the local material properties. We present a novel mode of fracture which involves the simultaneous progression of both, a crack and a front of delamination. We describe the fracture mechanism with universal energy arguments and provide a simple model describing the crack path. We eventually characterize the dynamics of the propagation. In a second model experiment, we study the fragmentation of coating deposited on a compliant substrate (motivated by flexible electronics application). We describe the fragmentation and propose an extension to an elastic layer deposited on an elastic foundation to an elasto-plastic case. Eventually, we study the compression and fragmentation of a zinc oxyde and silver multilayer
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  • HAL Id : tel-01037916, version 1

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Joel Marthelot. Rupture et délamination de films minces. Autre [cond-mat.other]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066085⟩. ⟨tel-01037916⟩

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