Effects of processing parameters on microstructure and mechanical behavior of SiO2/Ti―6Al―4V joint brazed with AgCu/Ni interlayer

SiO2 glass-ceramic was successfully joined to Ti-6Al-4V alloy with a AgCu/Ni composite interlayer. The brazing temperature varied from 950 to 980 C, with a holding time ranging from 1 to 45 min. AgCu eutectic foil melted first, followed by the Ti-Cu-Ni ternary eutectic reaction, then Ti reacted to SiO2 glass-ceramic. All the Ti atoms came from the Ti-6Al-4V alloy but not from the braze alloy. The effects of brazing temperature and dwell time on the interface structure and joint strength were studied. The largest shear strength of brazed joint could reach 110 MPa with a brazing temperature of 970 C and holding time of 10 min, and fracture occurred in the SiO2 glass-ceramic part.