Élaboration de vitrocéramiques et de composites particulaires à matrice vitreuse aux propriétés mécaniques et fonctionnelles innovantes

Abstract : In this thesis, glass-ceramics and glass matrix composites have been developed in order to study the interactions between the crack and the various inclusions. Firstly, the nucleation and volume crystallization of spherulites in a glass of the BaO-Al2O3-SiO2 system were studied. Then, the influence of crystallization on elasticity, hardness and toughness was measured. An increase of these properties due to crystallization was observed. After doping with rare earths oxides, the glass was functionalized by surface crystallization of phosphorescent crystals. Secondly, the influence of a Poisson’s ratio differential (between the matrix and inclusions) on the crack propagation was studied. For this purpose, glassy particulate glass matrix composites have been elaborated by Spark Plasma Sintering (SPS) and studied by Double Cleavage Drilled Compression (DCDC). A deviation of the crack in the vicinity of the glass inclusions has been identified in the case where the Poisson’s ratio of the inclusion is lower than the one of the matrix. In the opposite case, less important deviations were noticed. Finally, nanocomposites functionalized with magnetite (Fe3O4) and gold particles were obtained after a SPS treatment. The properties provided by these particles allowed the material to be heated, respectively, by induction and by laser irradiation. In the second case, after a 10 min laser treatment, a partial healing of indentation cracks could be observed.
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Julien Moriceau. Élaboration de vitrocéramiques et de composites particulaires à matrice vitreuse aux propriétés mécaniques et fonctionnelles innovantes. Mécanique des matériaux [physics.class-ph]. Université Rennes 1, 2018. Français. ⟨NNT : 2018REN1S094⟩. ⟨tel-02143123⟩

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