Direct diffusion bonding TC4 to ZQSn10-2-3

Thorough experimental study on diffusion bonding of T and ZQSn10-2-3 was carried out. The results indicated that the influence law of bonding temperature and bonding time on shear strength of joints was similar, and the shear strength of joints reached the maximum value(τ_max=102 MPa) when the optimum bonding parameters were chosen as follows:bonding temperature of 830℃, bonding pressure of 10 MPa, bonding time of 15 min. In the bonded joint under the optimum bonding parameters, there existed four different zones:zone I was composed of CuSn₃Ti₅ and Pb particles, zone II consisted of CuSn₃Ti₅, Cu₃Ti and Pb particles, zone III chiefly contained β-Ti, and zone IV was composed of α-Ti mainly and a little β-Ti. In addition, the fracture morphology of diffusion bonded joint of T to ZQSn10-2-3 showed brittle facture characteristics, and the fracture surface phases consisted of CuSn₃Ti₅, Cu₃Ti and Pb particles precipitated, which was the main reason for degradation in the mechanical properties of the joints.