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Étude de vieillissement et caractérisation d’assemblage de module de puissance 40 kW pour l’aéronautique

Abstract : This work is part of “GENOME” project which focuses on high-temperature packaging solutions for electronic power modules. Its mission is to study the reliability of power modules, in particular, the die attach layer. Due to the physical properties of silver and gold-tin, they were selected as die bonds to assess the evolution of their reliability during ageing. In order to achieve this, an appropriate methodology of the power modules reliability has been defined in order to guarantee the results exploitability. Destructive and non-destructive analyzes were carried out on samples aged by different profiles of thermal cycling. These analyzes allowed us to compare the influence of each cycling profile on the reliability of samples. A study of the thermomechanical behavior of power assemblies was carried out using finite element modeling (FEM). A methodology for evaluating the reliability of assemblies during accelerated ageing is developed. A second axis allows us a better understanding of the failure modes and their effects. It also highlights the limitations of severe accelerated ageing. Consequently, the choice of temperature profile is questioned and a limitation of the temperature profile severity must be considered, in order to avoid producing degradations that are not actually found in mission profile.
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Submitted on : Thursday, July 6, 2017 - 12:48:05 PM
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Faical Arabi. Étude de vieillissement et caractérisation d’assemblage de module de puissance 40 kW pour l’aéronautique. Electronique. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0603⟩. ⟨tel-01557536⟩

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