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Drying behaviour of ceramic green bodies : experimental characterization and numerical modelling

Abstract : The present thesis is part of a long-term objective to control the drying step of ceramic green bodies in real-time. Given this general aim, the present work is based on two complimentary parts. The first part deals with the measurement of drying parameters (sample temperature, moisture content and dimension changes by an optical method). Then, since the ultimate objective of this work is the construction of a numerical model, an experimental evaluation of physical properties involved during drying is made for input into the model. The current study is focused on two technologically important materials frequently used in the ceramic industry which are alumina and clays (kaolin here). Alumina is one of most common raw materials used in technical ceramics and kaolin is typically used in traditional ceramics. Experimentally, the macroscopic drying behaviour of both materials zqs determined as well as the dependence of physical properties (in particular the diffusion coefficient and the thermal conductivity) on moisture content as drying proceeds. Furthermore, a study on the spatial distributions of water within the ceramic green body at different scales (MRI and ESEM) is used to interpret how physical properties vary with moisture content. Then, from the examination of numerous situations of drying, we concluded that the proposed numerical model yields good predictions of moisture content and the green body temperature. These parameters can help to evaluate progress in the drying step with eventual feedback in process control.
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Submitted on : Monday, March 2, 2020 - 2:44:08 PM
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  • HAL Id : tel-02495750, version 1



Siham Oummadi. Drying behaviour of ceramic green bodies : experimental characterization and numerical modelling. Materials. Université de Limoges, 2019. English. ⟨NNT : 2019LIMO0112⟩. ⟨tel-02495750⟩



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