Self-joining of K9 glass using Sn0.3Ag0.7Cu-Ti filler metal and its joint properties

Solving the problem of poor spreading ability of metal filler on glass is important in studying the bonding of glass. In this work we achieved the self-joining of K9 glass using Sn0.3Ag0.7Cu (SAC)-Ti filler. The addition of Ti (1, 2, 3, 4, 6, and 8 wt%) was shown to effectively impact the microstructure and mechanical properties of the brazing joints. A dense K9/SAC-x%Ti/K9 joint can be obtained through the reaction of Ti and SiO2, which formed TiO2 and TiSi at the brazing temperature of 630–690 ℃ for 10 min. Meanwhile, the brazing seam of K9/SAC-x%Ti/K9 joints also possessed a Sn matrix with Ti2Sn3 phases. According to the shear test, the brazed joint with 3 % Ti content could reach a maximum value of 19.3 MPa at 650 °C. The introduction of Ti effectively modified the wettability of SAC filler on K9 glass and provided a new brazing method for low-softening point glass.