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Synthèse de céramiques PZT à microstructure contrôlée

Abstract : This work deals with the realization of textured PZT ceramics. The various stages of elaboration of those ceramics : grains synthesis, their casting and sintering are invastigated. The first part of the thesis consists in synthetizing PZT grains with a stoichiometric composition and a morphology allowing some texturation. Two methods of synthesis are tested: the hydrothermal synthesis and the flux growth synthesis. The hydrothermal synthesis appears to be inappropriate for the realization of grains allowing the elaboration of textured materials. Only the flux synthesis allows to realize large-sized and cubic morphology grains which can be used in a manufacturing process of textured ceramics. The second part concerns the implementation of these grains by tape-casting to induce a granular orientation by lamination. In the last part, as the densification behavior of these tape-cast sheets by natural sintering is limited, we have to use assisted methods as the SPS or the hot pressing. Dense ceramics of textured PZT are so realized. After polarization under electric field, a gain of 116 % for the piezoelectric constant is obtained
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Stéphanie Devemy. Synthèse de céramiques PZT à microstructure contrôlée. Mécanique des matériaux [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2008. Français. ⟨NNT : 2008VALE0014⟩. ⟨tel-03015729⟩

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