Microstructure and formation mechanism of C_f/SiC and Nb joint brazed with laminated amorphous Ti–Zr–Cu–Ni/crystalline Ti composite filler

Metallic glasses are excellent filler materials for joints and heterostructures. However, limited attempts have been made to explore the origin of interactions between metallic glasses and other materials in depth. This study revealed the main interaction process of amorphous Ti–Zr–Cu–Ni/crystalline Ti in the heating process and formation origin of interface phases in the C_f/SiC and Nb joints brazed by amorphous Ti–Zr–Cu–Ni/crystalline Ti composite filler. Ti metal had limited dissolution in the liquid of amorphous alloys far below the equilibrium temperature, and then directly experienced an isothermal solidification. In the brazing process, the growth of the TiC layer on the C_f/SiC side and β-(Ti,Nb) layer on the Nb side was controlled by the diffusion of C atoms and dissolution of Nb parent material, respectively. The joint of C_f/SiC and Nb possessed a high shear strength of 121 MPa at 1000 °C for 15min.