The interfaces formed between vitreous or thermally devitrified fused quartz substrates and silver alloys after 90 min at 850 degrees C in vacuum have been characterized. Three silver alloys have been used: Cusil (Ag-28 wt % Cu), Cusil-ABA (Ag-35 wt % Cu-1.5 wt % Ti), and Incusil-ABA (Ag-27 wt % Cu-12 wt % In-2 wt % Ti). A non wetting condition is found for the Cusil alloy in both substrates. In contrast, the formation of Ti5Si3, Cu3Ti3O and Ti2O3, following the sequence SiO2 -> Ti2O3 -> Ti5Si3 -> Cu3Ti3O, is observed at the metal/ceramic interface for the two titanium-containing alloys on both substrates. Ti2O3 is commonly found as small particles dispersed in a silver-rich matrix. During the experiments, the reaction product layers detach from the ceramic surface and float away from the ceramic/metal interface due to their relatively low density with respect to the liquid alloy. The formation of the phases detected at the ceramic/metal interface can be explained in terms of their relative thermodynamic stability.