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Composés de type La2Zr2O7 élaborés par projection plasma de solution et par chimie douce : application aux moteurs spatiaux

Abstract : These work deal with the conception of La2Zr2O7 coatings by Solution Precursor Plasma Spraying (SPPS) for thermal barrier application in space engine. Different precursors’ solutions of various solvents were prepared for powder synthesis and the realization of different coatings. Precursors and solvents have important effect on interactions in solution leading to the modification of powder properties, especially crystalline phases or densification. Similarly the diversity of studied solutions and the optimisation of thermal projection parameters allowed the elaboration of various coatings’ microstructures (dense, homogeneous porous and columnar). Columnar microstructure show better resistance to thermal cycling shock experiment than others coatings. It was also established a correlation between the SPPS coatings and powders structural data.
Keywords : Pyrochlore Solvent Spps
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William Duarte. Composés de type La2Zr2O7 élaborés par projection plasma de solution et par chimie douce : application aux moteurs spatiaux. Matériaux. Université de Limoges, 2015. Français. ⟨NNT : 2015LIMO0083⟩. ⟨tel-02003422⟩

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