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Imprimabilité de pâtes céramiques par robocasting : Applications aux matériaux denses et multimatériaux

Abstract : The main goal of this thesis is to elaborate dense single and multi-material ceramic parts with complex architectures. These architectures are realized using an additive manufacturing technology of extrusion of ceramic pastes through a fine syringe (DIW : robocasting). This research work is financed by the ANR CERAPIDE project, which aims to produce ceramic parts more quickly and with less energy consumption, from formulation to post heat treatment stages. Thus, the formulations of the pastes are optimized by adapting the additives and their quantities in order to obtain homogeneous pastes, without defects and having the rheological properties necessary for printing. Among other things, a ceramic paste must have be shear-thinning while having a high yield stress to be able to be printed by successive stacking of layers. The rheological control and the optimization of the formulations allow to print dense parts with improved mechanical properties. The change of additive allows to modify the topography of the dense parts and thus to modify the mechanical properties of the parts. The definition of printability of ceramic pastes is studied to understand the relationships between microstructural, environmental and technological properties. Finally, the printing parameters must be selected according to the final properties desired for the printed part. The understanding of all these parameters allows the development of alumina parts with an average stress at break of 350 MPa without polishing steps.
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Theses
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https://theses.hal.science/tel-03789689
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Submitted on : Tuesday, September 27, 2022 - 3:50:28 PM
Last modification on : Friday, September 30, 2022 - 11:40:09 AM

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  • HAL Id : tel-03789689, version 1

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Mathilde Maillard. Imprimabilité de pâtes céramiques par robocasting : Applications aux matériaux denses et multimatériaux. Matériaux. Université de Lyon, 2022. Français. ⟨NNT : 2022LYSEI035⟩. ⟨tel-03789689⟩

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