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Physico-chimie du brasage du carbone vitreux : mouillage et réactivé interfaciale

Abstract : In this work we performed an experimental study of the reactive wetting of vitreous carbon by reactive alloys in order to deepen the understanding of the wetting and interfacial reactivity phenomena for brazing applications. The systems chosen for this study are composed of a vitreous carbon substrate and two types of liquid alloys: low melting point alloys and medium melting point alloys. These alloys are composed of a non-reactive matrix (essentially Sn for low-melting point alloys and Ag-Cu-In for medium-melting point alloys) and a reactive solute forming a wettable carbide (Ti or Cr). The kinetics of the spreading of these alloys on the vitreous carbon is studied according to different parameters; temperature, surface finish of the substrate and reactive element content. The reaction products formed are characterized by SEM, TEM/ASTAR and XRD and the formation mechanisms of these products are proposed. Experiments on the optimization of homogeneous carbon brazing by medium melting point alloys are presented and other preliminary experiments for homogeneous and heterogeneous brazing by low melting point alloys are proposed, opening on the prospects of this thesis work.
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Meryem Tazi. Physico-chimie du brasage du carbone vitreux : mouillage et réactivé interfaciale. Matériaux. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAI085⟩. ⟨tel-02497152⟩

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