Influence des coulées successives sur des alliages Ni-Cr et Co-Cr employés en odontologie prothétique

Abstract : This study deals with microstructural, structural, chemical and mechanical properties of two predominantly based dental alloys (Co-Cr, Colado CC® and Ni-Cr, Colado NC®). Cast alloys are characterized to analyze microstructure, structure, composition stability, hardness and elastic modulus. Solidification path was determined and microsegregation has been characterized. Influence of recasting has next been studied. Five times recasted alloys in different amounts were processed (0, 25, 50 and 75% of new alloy). It was demonstrated that the examined alloys are characterized by a dendritic microstructure with a large grain size, typical of the cast materials. No notable degenerative changes in microstructure were observed. Al2O3 particles were characterized on Ni-Cr alloy. Occurrence of porosities significantly increase in recast samples but remains clinically acceptable. Alloys demonstrated great compositional stability after 5 recasts. A significant decrease in Vickers hardness values appeared in the fourth recast in both alloys. Alloys showed no significant variation in term of modulus of elasticity, although a slight tendency decrease was observed. The main phase encountered is a face centered cubic solid solution. Secondary phases were identified. Number of recasting demonstrated to have negligible effect on phase identification and on solidification path.
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Anne-Sophie Vaillant-Corroy. Influence des coulées successives sur des alliages Ni-Cr et Co-Cr employés en odontologie prothétique. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0056⟩. ⟨tel-02328727⟩

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