抄録
Carbon-carbon composites were brazed to a Ni-based super-alloy (Inconel 600) using a Fe-Cr-Ni filler metal (TB-2720) with a Nb interlayer at 1080℃ for 300s in vacuum 1.33×10^<-2>Pa {1.0×10^<-4>Torr}. The Nb foil with various thicknesses from 0.1 to 0.5 mm was inserted in the brazing interface to relieve residual stress. The metallurgical microstructure of the brazed joint interface was observed through the scanning electron microscope (SEM). By analyzing with the energy dispersive spectroscopy (EDS), the constituents' distribution at the brazed interface was measured. A crack due to residual stress was formed in the C/C composites near the brazed interface of specimens with thinner Nb foil than 0.2mm. The results suggest that in order to release enough residual stress, the Nb foil must be thicker than 0.2mm. When the foil thickness was 0.5mm, the shear strength of the joint was 9.63MPa.
