Brazing of C_f/SiC composite to Ti alloy with Ag-Cu-Ti-C_f composite filler

C_f/SiC was successfully joined to Ti alloy with Ag-Cu-Ti-C_f (C_f,carbon fiber) mixed powder by proper brazing parameters.Microstructure of the brazed joints were investigated by SEM,EDS and XRD.Its mechanical properties were meas-ured by mechanical testing machine.The results showed that Ti element in the interlayer can react with the brazed composite,a mixture of Ti₃SiC₂,Ti₅Si₃ and TiC composites finally formed in the reaction layer between composite and interlayer.Ti alloy con-stantly dissolves and Cu diffuses into the Ti alloy,which forms the diffusion-reaction layers between interlayer and Ti alloy.The performed joints have dense bonding layers reinforced by short carbon fibers.These composite in brazing layers relaxes the ther-mal stress of the joints effectively.The shear strength of the joint brazed with Ag-Cu-Ti-C_f filler was remarkably higher than that with pure Ag-Cu-Ti filler.