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Étude de l’évolution chimique et microstructurale lors de la consolidation par frittage d'un alliage d'or 18 carats après mise en forme par Injection de Poudres Métalliques.

Abstract : The shaping of 18 carat gold alloy parts by the MIM process greatly allows manufacturers of jewellery to imagine new more complex form without impacting the manufacturing costs while strongly reducing the recycling loop of the alloy compared to other manufacturing processes. The aim of this study is to be able to guarantee the microstructure of parts shaped by MIM to ensure their viability for application in the luxury industry. This work has highlighted two main problems, that have been studied in parallel and may lead to the rejection of 18 carats gold alloy parts made by MIM : these are an abnormal grain growth during sintering and the subsistence of non-sintered areas (NSA) after the treatment. Initially, the study of influence of well-known parameters in the literature (duration, temperature, heating ramp, sintering atmosphere) confirmed some classical trends. However, their optimization was not sufficient to solve all the problems. A thorough study of non-sintered areas type defects have led to the identification of a pollution localized in these zones. New parameters then could be highlighted, namely the morphology of the powder as well as the nature of the support employed during sintering. We could show the important role they play as for the occurrence of these defects. Finally, based on the results obtained, the study proposes an optimized cycle making possible to meet the criteria specified on the parts.
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Submitted on : Tuesday, April 12, 2022 - 5:54:40 PM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
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  • HAL Id : tel-03639317, version 1

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Hubert Mulin. Étude de l’évolution chimique et microstructurale lors de la consolidation par frittage d'un alliage d'or 18 carats après mise en forme par Injection de Poudres Métalliques.. Sciences de l'ingénieur [physics]. l’École Nationale Supérieure d'Arts et Métiers, 2012. Français. ⟨NNT : 2012ENAM0014⟩. ⟨tel-03639317⟩

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