Contribution à la recherche de matériaux de type «siliciures» résistant à l’environnement à haute température en vue d’applications dans le domaine de la thermoélectricité

Abstract : The constant deployment of new sensors networks in confined areas of turbomachines or difficult to access, requires the input of energy to power these sensors. Many researches are thus focused on a permanent power supply of sensors to monitor new components. One possible way of permanent power supply is the use of thermoelectric modules to convert the thermal energy from combustion into the turbines. Among the thermoelectric materials, silicides seem to be the most promising family for high temperature applications (above 700 °C). The subject of this thesis is the study of silicides known for their high temperature oxidation resistance in order to produce thermoelectric modules that can operate at optimal temperatures around 700 °C. To this end, different representatives of the silicide family have been studied by ab initio calculation using the density functional theory. This tool allowed to calculate their potential thermoelectric properties and showed that the two best candidates for cheap applications were the disilicides of manganese and iron. The calculation also showed the metallic character of many ternary silicides. The promising silicides were developed by sintering method and their aging as well as their coefficients of thermal expansion were studied. This knowledge has made it possible to develop thermoelectric modules based on silicides resistant to 900 °C in air. Although possessing modest thermoelectric properties, their resistance to high temperature oxidation makes it possible to envisage the manufacture of thermoelectric modules
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Florian Brix. Contribution à la recherche de matériaux de type «siliciures» résistant à l’environnement à haute température en vue d’applications dans le domaine de la thermoélectricité. Matériaux. Université de Lorraine, 2018. Français. ⟨NNT : 2018LORR0174⟩. ⟨tel-01963833⟩

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