Brazing of C_f/SiC composite to Ti alloy using Ag-Cu-Ti-TiC composite filler materials

Cf/SiC composite was joined with Ti alloy using Ag-Cu-Ti-TiC mixed powder as interlayer under condition of some suitable brazing parameters. The microstructures of the brazed joint were investigated by SEM, EDS and XRD. The mechanical properties of the brazed joints were measured by mechanical testing machine. The results show that Ti element in the interlayer can react with the brazed composite, a mixture of Ti-Si-C, Ti-Si and TiC composites finally form the reaction layer between the composite and interlayer. Ti alloy constantly dissolves and Cu diffuses into the Ti alloy, the diffusion reaction layers between the interlayer and Ti alloy forms. The performed joints have dense bonding layers reinforced by TiC. These composite brazing layers relax the thermal stress of the joint effectively. These characteristics are beneficial to the joint, of which the shear strength are remarkably higher than the optimal shear strength of the joint brazed with pure Ag-Cu-Ti.