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Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse

Abstract : In the field of structural materials for thermomechanical applications under extreme conditions, metal carbides, and more specifically, those of the transition metal family (i.e. titanium, zirconium, hafnium) are good candidates thanks to the nature of the both metallic and covalent bonds. Further, among the non-oxide ceramics, silicon carbide is the most used in the elaboration of particulate composites because of its good oxidation behavior at high temperature. SiC/ZrC composites would be good candidates for high temperature applications in oxidizing atmospheres thanks to their ability to develop interesting thermostructural properties. However, the development of particulate composites, with good control of the respective distribution of the two carbides phases in the microstructure is not well controlled. Particularly, improving or optimizing the thermomechanical performances of these advanced ceramics, requires to control the chemical composition at the atomic scale and their nanostructuration. The "Precursor Derived Ceramics" approach (PDCs) notably allows to modulate the composition of the material at the molecular level and to obtain materials of various and complex shapes (nanomaterials, fibers, deposits, composites). This method, applied to the Si/C/Zr system is based on the synthesis ofpreceramic polymers by click chemistry and hydrosilylation. Ultrafine powders obtained after laser spray pyrolysis heat treatment could be shaped, consolidated and densified.
Keywords : SiC/ZrC Composites
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Fabien Bouzat. Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse. Matériaux. Université de Limoges, 2015. Français. ⟨NNT : 2015LIMO0130⟩. ⟨tel-01317458⟩

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