Ti-50Ni钎焊TZM与ZrC_p-W接头界面组织及性能

Vacuum brazing of TZM alloy and ZrC_p-W composite was achieved by Ti-50Ni (at%) brazing alloy. The interfacial microstructure of the joints was characterized using SEM, EDS and XRD. In addition, the effect of brazing temperature on interfacial microstructure and joining properties of TZM/Ti-50Ni/ZrC_p-W brazed joints was also investigated. Results show that the typical interfacial microstructure of the brazed joints is TZM/Ti-Mo+TiNi₃+Mo-Ti-W/TiNi+TiNi₃+W(s,s)+(Ti,Zr)C/ZrC_p-W. As the brazing temperature increases, more and more Ti and Ni elements in molten brazing alloy diffuse into the base materials, which in turn broaden the brazed joints. At the same time, the grain size gradually increases and the grain boundary becomes smoother. Shear strength increases first and then decreases with the brazing temperature increasing. Reliable brazed joints with average shear strength up to 146 MPa is achieved when brazing at 1340 °C for 10 min.