Characterization of WC–Co/Ti6Al4V diffusion bonding joints using Ag as interlayer

The present work defines optimal parameters used in a diffusion bonding process. A hard metal (WC–15% Co) and a titanium alloy (Ti6Al4V) were joined using a Ticusil (Ag–Cu–Ti) filler. The identification of the intermetallic phases formed in the joint interfaces provides an explanation of the shear strengths obtained. The temperature and load conditions that guarantee strong joints are associated with the intermetallic phases formed, ζ(CuTi) and TiC. These temperature–time conditions are 850 °C, 30–60 min, with loads of 2 MPa and a vacuum between 10− 2–10− 3 Pa.