Brazing temperature and time effects on the mechanical properties of TiC cermet/Ag-Cu-Zn/steel joints

This study investigates the influences of brazing temperature and time on mechanical properties of TiC cermet/Ag-54Cu-33Zn/steel joint. Test result shows that interface products of the brazed joint are, respectively (Cu, Ni), Ag (s.s) + Cu (s.s), (Cu, Ni), (Cu, Ni) + (Fe, Ni) from TiC cermet to steel side. When the brazing temperature is low or time is short, the joint belongs to cleavage and quasi-cleavage fracture and the fracture site is on the interface of (Cu, Ni)/Ag (s.s) + Cu (s.s). When the brazing temperature and time are increased to 850 °C and 15 min, the joint achieves the maximum shear strength 95.7 MPa, which is tough and cleavage fracture and the major fracture site is in Ag (s.s) + Cu (s.s) zone. Furthermore, when the brazing temperature or time continues to be increased, the joint belongs to cleavage and quasi-cleavage fracture and the joint cracks in (Cu, Ni) + (Fe, Ni) zone or (Cu, Ni) zone.