Étude expérimentale et modélisation micromécanique du comportement de composites hybrides : optimisation de la conductivité thermique

Abstract : The increase of electronic components in the integrated circuits and the required electrical power set the question of the dissipation of the heat generated. The electrical box must favor the heat dissipation while maintaining electrical insulation. The solution chosen to transfer the heat is to develop composite materials whose reinforcements by their structure will improve the thermal conductivity. Polymer-based composite materials were chosen for their building ability. Thermal conductivity and electrical insulation are insured by ceramic reinforcements. The homogenization methods allow to improve the composites’ design according to the properties of their constituents, their geometry and their distribution. They thus provide an optimized formulation of materials satisfying the characteristics emanating from the industrial partner (‘Institut de Soudure’). The expected thermal conductivity of the composites imposes a high volume fraction of reinforcements to counterbalance the insulating polymer matrix. Homogenization methods have been developed to provide predictions of effective thermal conductivity for high (greater than 20%) reinforcement rates and high thermal conductivity contrasts. The presence of an interphase resulting from strong physico-chemical incompatibilities between the components must also be modeled.
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Antoine Jeancolas. Étude expérimentale et modélisation micromécanique du comportement de composites hybrides : optimisation de la conductivité thermique. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine, 2018. Français. ⟨NNT : 2018LORR0285⟩. ⟨tel-02109674⟩

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