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

Cf/SiC was successfully joined to Ti alloy with Ag-Cu-Ti-Cf(Cf,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-Cf filler was remarkably higher than that with pure Ag-Cu-Ti filler.