CHARACTERIZATION OF Al2O3/TA6V AND ZrO2/TA6V CERAMIC-METAL INTERFACES
Résumé
Alumina and zirconia were joined to a Ti-6Al-4V alloy (TA6V) using an active braze of composition Cu-40Ag-5Ti. The interface region is shown to be very complex, consisting of numerous lavers of varying composition and thickness. The chemical interaction of the braze with the ceramic results in a Cu2 (Ti, Al)4O layer. Adjacent to the Ti-6Al-4V base metal, a series of Cu-Ti intermetallic phases is observed. The TA6V/Al2O3 and TA6V/ZrO2 interface regions exibit rather similar microstructures. However, the mechanical properties of the joints in these two systems are very different. The tensile strength of the joints in is significantly lower in the case of TA6V/Al2O3 (3MPa) than for TA6V/ZrO2 (150MPa).
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Articles anciens
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