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Étude et modélisation thermodynamique du système Mo-Pt-Si

Abstract : The study on the Mo-Pt-Si system contributes to the knowledge of complex metal alloy, which are intended for applications at high temperatures in the aerospace or glass industries. Its thermodynamic description is difficult because its refractory character related to the presence of the molybdenum and to its complexity due to the high number of the constituents (3 elements). Only an approach of problem by a modelling thermodynamics of CALPHAD type gives to a significant result. As imposes the establishment of a modelling of a ternary system by the study of three binary borders, the first part of this work was devoted to the study of Pt-Si, Mo-Pt and Mo-Si systems. Along with the optimization, an experimental measurements used in this study (X-ray, thermal analysis, microprobe,...) allowed to determine the equilibria phases, the enthalpies of formation of the various intermetallic compounds as well as the structural mechanisms responsible for large domains of stability observed for some phases. The first approach of the Mo-Pt-Si ternary system obtained from the database including the binary optimisations, allowed to interpret the experiments of controls of equilibria phases in isotherm and anisotherm conditions. A new ternary silicide was discovered and took into account in calculation. Finally, through many examples we show the agreement of the modelling with all experimental data.
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https://hal.univ-lorraine.fr/tel-01748466
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  • HAL Id : tel-01748466, version 1

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Tewfik Benlaharche. Étude et modélisation thermodynamique du système Mo-Pt-Si. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10036⟩. ⟨tel-01748466⟩

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