Elaboration d'assemblages multicouches polymère/métal par frittage "Spark Plasma Sintering" pour des applications d'allègement de structure

Abstract : Polymer/metal multilayer assemblies, combining the low density of the polymer with the strength of the metal, are considered to be of great interest for high-demand engineering applications, especially in the transportation industries where the lightweighting issues are predominant. Keeping this in mind, the present study deals with the development of this kind of assembly, using thermostable thermoplastic polymers associated with an aluminum alloy by means of a powder metallurgy process: the “Spark Plasma Sintering” (SPS) technology.As the first part of this work, the sintering of the polymer was considered. The effects of SPS parameters such as temperature, pressure, and dwell time on mechanical properties of a PolyEtherEtherKetone (PEEK) were investigated thanks to a design of experiment. This study allowed to determine the mechanisms of polymer’s consolidation and the intricate role of pressure on the PEEK crystallinity was examined with particular attention.Then, the development of the assembly, without adhesive part, composed of both polymer (polyimide or PEEK) and aluminum alloy was considered. An approach was set up to improve the compliance between these dissimilar materials comprising: surface treatments on aluminum in order to enhance their mechanical anchoring and their chemical compatibility, as well as polymer reinforcement with the aim of reducing its thermal expansion. The efficiency of each solution is discussed based on microstructural and mechanical characterizations. This approach enabled to process multilayer assemblies with a significant strength at the interface.
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Jean-Charles Sébileau. Elaboration d'assemblages multicouches polymère/métal par frittage "Spark Plasma Sintering" pour des applications d'allègement de structure. Chimie-Physique [physics.chem-ph]. Université de Haute Alsace - Mulhouse, 2018. Français. ⟨NNT : 2018MULH1038⟩. ⟨tel-02180524⟩

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