Interface evolution of SiO₂ glass ceramic and Ti-6Al-4V alloy joint brazed with Ag-Cu-Ti alloy

In the present paper, SiO₂ glass ceramic and Ti-6Al-4V alloy were successfully brazed with Ag-21Cu-4·5Ti active braze alloy. The interfacial microstructure and evolution course of SiO₂ glass ceramic/Ti-6Al-4V joint were studied in detail. According to the experimental results, active element Ti plays a quite important role in the formation of reaction layers on the joint interface. The reaction products of the joint are TiSi₂, Ti₄O₇, TiCu, Cu₂Ti ₄O and Ti₂Cu respectively. The interface evolution can be generally described by four stages, which are solution and diffusion of atoms, reaction among atoms, formation of reaction layers and precipitation of solid solution layers respectively.