Gouttes millimétriques d'eau en milieu confiné : comportement au cours du séchage

Abstract : This work aims at improving the understanding of the specific mechanisms of the drying of ceramic materials. This step is crucial when manufacturing a piece. Indeed, besides the optimization of the sample composition, the temperature and the relative humidity have to be controlled so that the weight loss andthe shrinkage do not cause any stress development, leading to cracks formation which can damage the final piece after a heat treatment. After a presentation of the different known drying mechanisms, this thesis highlights a set of measuring benches conceived within an instrumented climatic chamber. A firststudy concerning the behavior of the shaping liquid as a function of temperature and relative humidity isrealized. Then, this liquid is inserted between two parallel and identical substrates in order to reproduce the case of a liquid bridge within a pore. The hydrophilic and hydrophobic contacts are then studied.Finally, drying experiences are carried out on ceramic materials to correlate the different observations.The obtained results demonstrate the importance of a compromise when selecting the drying parameters.The temperature and the relative humidity not only influence the kinetics of the process during the liquiddeparture, but also modify the contact with the solid phase of the ceramic piece. At the end of drying, the rupture of liquid bridges is brutal and can explain some macroscopic phenomena observed when dryinglarge pieces.
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Etienne Portuguez. Gouttes millimétriques d'eau en milieu confiné : comportement au cours du séchage. Matériaux. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0130⟩. ⟨tel-01485054⟩

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