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Contribution à l'étude des mécanismes de mouillage réactif

Abstract : In this work we performed an experimental study of reactive wetting to understand the relation between the spreading of the liquid and the formation of a new phase at the liquid/solid interface. The model systems chosen for this study are composed by a carbon substrate (vitreous carbon or monocrystalline graphite) and a liquide alloy consisted of a non-reactive matrix (essentially Cu but also Ni, Ge and Sn) and a reactive solute (Si, Cr, B and Ti) forming a wettable carbide. This choice allows the two types of reactive spreading to be obtained, ie controlled by the chemical reaction or by the diffusion of the reactive solute. The spreading kinetics are studied using two specific methods (the "trasnfered" drop and the "dispensed" drop) which allow the processes of drop formation and of spreading to be separated. Surface control and characterization of the interfaces are performed using optical microscopy, high resolution optical profilometry, scanning electron microscopy, energy dispersion spectroscopy and Auger spectroscopy. In the case of spreading kinetics controlled by the chemical reaction we show that in the general case wetting usually takes place in a single stage at decreasing spreading velocity, and that this velocity depends only on the instantaneous contact angle. We define this contact angle as an equilibrium contact angle which reflects continually the coverage of the liquid/solid interface by the reaction product at the triple line. Finally, we show that reaction kinetics and spreading kinetics are controlled by the dissolution of the substrate. In the case of spreading kinetics controlled by the diffusion of the reactive solute, we perfom a numerical modelling which takes into account the role of the diffusion and interfacial reaction behind the triple line, and also the role of the evaporation/condensation which occurs ahead of the triple line.
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Contributor : Olivier Dezellus <>
Submitted on : Tuesday, July 19, 2005 - 9:59:41 AM
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  • HAL Id : tel-00009773, version 1




Olivier Dezellus. Contribution à l'étude des mécanismes de mouillage réactif. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2000. Français. ⟨tel-00009773⟩



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