Interfacial microstructure of Al 2 O 3 /Ti-6Al-4V joints brazed with (Ag 72 Cu 28 ) 97 Ti 3 filler metal

Abstract

In the present work, Al₂O₃ ceramic was brazed to Ti-6Al-4V using (Ag₇₂Cu₂₈)₉₇Ti₃ filler metal at 1073-1173 K for 1.8 ks. The interfacial phases formed and the microstructure were investigated by SEM, X-ray diffraction, and energy dispersive spectroscopy; and the mechanism of the formation of these reaction products is discussed in this paper. It has been found that the interfacial microstructure of joints brazed at 1123 K for 1.8 ks was Al₂O₃/Cu₂Ti₄O/Cu₄Ti₃O + Cu solid solution/Ag-Cu eutectic + Ag rich phase, while the interfacial structure of joints brazed at 1173 K for the same holding time was Al₂O₃/Cu₃Ti₅O + CuAl₂O₄/Cu₄Ti₃/Ag rich phase + Cu₄Ti₃.

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