Microstructure and Properties of Brazed Joint of C_f/C Composite by Vacuum Brazing Using Cu Based Active Brazed Filler

Cf /C composite was brazed in vacuum using pure Al and Cu-Ti as brazing fillers,and the shear strength of the brazed joints was measured.The microstructure,forming mechanism and strength of the brazed joints were studied by scanning electron microscopy and energy dispersive X-ray spectrometer.The results indicate that using Cu based metal as active filler,the connection of Cf /C composite can be realized.The component of brazing fillers have a great effect on the quality of the brazed joints at experiment temperature.The highest shear strength of the brazed joints can reach 21 MPa.