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Les céramiques venues du froid… : Formulation, congélation et structuration par ice-templating

Abstract : Ice-templating is a processing route used to obtain porous material with a controlled porosity by freezing a suspension. Researches focused on this subject so far revealed a lack of information about mechanisms controlling the freezing of suspensions with a high solid loading and their consequences over porous microstructures, depending on the composition of the suspension in terms of additives nature and quantity. The objectives of this work are to observe and characterize in and ex situ the formation of structures by ice-templating and to establish the relationships between the composition of suspensions, process and porous morphology of frozen and sintered bodies. The advancement of the freezing front of a panel of alumina suspensions, with characterized properties was investigated by X-ray radiography and the microstructures of frozen or sintered samples were characterized by X-ray tomography and SEM. We have defined the different stages of the freezing by ice-templating, the associated frozen and sintered microstructures, the influence of the composition of the suspension and the mechanisms responsible for defects creation. The ionic strength generated by the dispersant quantity, the addition or not of a binder and the cooling rate of suspension are three parameters with critical consequences on microstructures, orientation and disorientation of ice crystals. Our results shed a new light on the freezing mechanisms of soils in geophysics and more particularly the ice lenses formation.
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  • HAL Id : tel-00717722, version 1

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Audrey Lasalle. Les céramiques venues du froid… : Formulation, congélation et structuration par ice-templating. Autre. INSA de Lyon, 2011. Français. ⟨NNT : 2011ISAL0070⟩. ⟨tel-00717722⟩

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