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Co-frittage du système LTCC/or : Approches couplées expérimentale, analytique et numérique

Abstract : LTCC (Low Temperature Co-fired Ceramic) and gold multilayers systems are extensively used in the development of multi-materials components for civil and military radio-frequency applications. This technology presents a high potential of development because it provides a packaging solution for electronic chips. During the process of drafting of these multi-materials components (ceramic metal), the co-sintering step is a key and critical one, indeed it leads to damages because of potential thermal expansion coefficients and shrinkage kinetics differentials. Thus, the aim of this work is to develop a numerical model able to faithfully simulate the components thermomechanical behavior during the co-sintering stage. To achieve this, the sintering and thermomechanical behavior of the selected ceramic and metal materials have been carefully characterized. The behavior laws so identified have been implemented in the software based on the finite elements method Comsol Multiphysics. The developed model robustness has been analyzed by confrontation with experimental tests driven by the establishment of an original shadowscopy apparatus which allows the in situ strain recording. Thus, the generated curvatures during the constrained sintering of a LTCC bilayer and during a gold-LTCC bilayer co-sintering have been characterized and compared with the numerical simulations.
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Submitted on : Wednesday, January 29, 2020 - 11:18:16 AM
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  • HAL Id : tel-02459120, version 2

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Adrien Heux. Co-frittage du système LTCC/or : Approches couplées expérimentale, analytique et numérique. Autre. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0098⟩. ⟨tel-02459120v2⟩

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