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Impact de l'utilisation de polycarbosilane dans l'élaboration de composites ZrC/SiC par frittage SPS

Abstract : This work focused on studying the impact of the addition of a polycarbosilane as SiC source in the production of ZrC / SiC composites by SPS sintering. The main challenge of this study lies in producing dense composites with a fine and homogeneous distribution of the SiC phase within the ZrC matrix. For this, two systems ZrC/polymer and ZrC functionalized/polymer were prepared using a so-called "hybrid" route. In both cases, the microstructural (SEM, TEM) and chemical (XPS) characterizations showed similarities with the presence of ZrC particles coated homogeneously by the polymer. The densification of the two systems was undertaken by SPS sintering. This step of the process required the implementation of a specific conversion/sintering heat treatment which, after optimization, made it possible to obtain dense composites (ρrelative > 96%) at relatively low temperatures (1700 ° C). The impact of using a polycarbosilane was highlighted through a comparative study with a composite prepared from a mixture of ZrC and SiC powders. To complete this work, a high resolution study of grain boundaries by TEM showed disparities depending on the functionalization or not of the surface of ZrC powders
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Hatim Laadoua. Impact de l'utilisation de polycarbosilane dans l'élaboration de composites ZrC/SiC par frittage SPS. Matériaux. Université de Limoges, 2019. Français. ⟨NNT : 2019LIMO0098⟩. ⟨tel-02477632⟩

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