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Étude tribologique à hautes températures de matériaux céramiques structurés à différentes échelles

Abstract : In order to evaluate and to understand the wear performance and mechanisms at high temperatures that take place when different chemical compositions (Al2O3, ZrO2, mullite), scales (finely structured, microstructured and submillimetric) and configurations (single layer, bilayer and volume) interact, atmospheric plasma sprayed coatings manufactured on a silicoaluminous ceramic substrate were used. The Al2O3, ZrO2-Al2O3 and ZrO2-Y2O3 coatings correspond to the monolayer configuration, as well as the finely and microstructured scales, while the Mullite/Al2O3, Mullite/ ZrO2-Al2O3 and of Mullite/ ZrO2-Y2O3 correspond to the bilayer configuration, where the outer mullite layer is microstructured and the sub-layers can correspond to finely and microstructured scales. In the same way, the Al2O3 and AZS commercial refractories correspond to the volume configuration and the submillimeter scale, taking into account that these have also been used as references because of the high resistance to wear that they show in glass and cement industries. Subsequently, these ceramic materials were subjected to sliding contact wear conditions (5 N, 20000 rpm and 0,10 ms-1) with a ball on disk tribometer at temperatures of: 25, 500, 750 and 1000 °C. The results indicate that the wear of the Al2O3, ZrO2-Al2O3 and ZrO2-Y2O3 coatings at 25 and 1000 ° C was by ductile deformation, showing wear rates of the order of 10-4-10- 6 and 10-4-10-5 mm3.N-1.m-1 respectively, while at 500 and 750 °C was by brittle deformation with wear rates of the order of 10-3-10-4 mm3.N-1.m-1 for both temperatures, finding a slightly higher wear resistance in finely structured coatings due primarily to toughness. Regarding the two electro-melted volume refractories at submillimetric scale, they showed wear by ductile deformation only at 1000 °C, showing wear rates of the order of 10-4 mm3.N-1.m-1. On the other hand, the mullite bilayer systems showed wear by brittle deformation at all evaluated temperatures, with wear rates of the order of 10-3-10-4 mm3.N-1.m-1, without showing any improvement at all because of the presence of the sub-layers. Finally, aiming to seek more economical options, as well as to give other applications to the materials studied, it has also been determined the influence on wear at high temperature of Al2O3 coatings, finely and microstructured, manufactured by the chep technique of oxy-flame spraying, as well as the same Al2O3 coatings manufactured by plasma spraying on a metallic substrate of Inconel 718, which is used by the space and aerospace industries, obtaining for both cases comparable and similar results to all those obtained previously.
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Iván David Franco Correa. Étude tribologique à hautes températures de matériaux céramiques structurés à différentes échelles. Matériaux. Université de Limoges; Universidad de Antioquia (Medellin), 2019. Français. ⟨NNT : 2019LIMO0106⟩. ⟨tel-02648104⟩

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