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Theses

Géopolymère en milieu acide : compréhension du processus réactionnel et développement de composites

Abstract : The aim of this study was to develop composites with an acid-based geopolymer matrix with mechanical properties suitable for aeronautical applications between 300 and 1000 ° C. These matrices are synthesized from metakaolin and dilute orthophosphoric acid. In order to identify the domain of stability of these matrices, their structural changes during consolidation and in temperature were analyzed by Fourier Transform and Nuclear Magnetic Resonance infrared spectroscopy as well as by X-ray diffraction, and were correlated with thermal analyzes. The objective was then to adapt the matrix formulation (consolidation temperature, [P], Al2O3 filler) to obtain a basalt fiber composite with optimal mechanical properties. Due to their poor properties, other types of oxide fibers were tested and the process parameters were adapted. Once the optimum fiber-matrix-process combination was identified, the mechanical properties of the composite were characterized at higher temperatures. The microstructure of the composites was determined by scanning electron microscopy and their mechanical properties by tensile and interlaminar shear tests.
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Submitted on : Tuesday, May 18, 2021 - 11:46:42 AM
Last modification on : Sunday, May 30, 2021 - 3:26:48 AM

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  • HAL Id : tel-03228598, version 1

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Virginie Mathivet. Géopolymère en milieu acide : compréhension du processus réactionnel et développement de composites. Matériaux. Université de Limoges, 2021. Français. ⟨NNT : 2021LIMO0022⟩. ⟨tel-03228598⟩

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