Interface structuce of ceramic/AgCuTi/stainless steel brazed joint

Domestic ceramics and 1Cr18Ni9Ti stainless steel were brazed using Ag-Cu-Ti filler metal. Microstructure, the component of characteristic points and the phases of brazing joints were studied by scanning electronic microscopy (SEM), energy distribution spectrometer (EDS) and x-ray diffraction (XRD). The results show that several kinds of intermetallics such as TiO₂, TiO, TiSi₂, Ti₅Si₃ and Fe₂Ti were formed. The interfacial structure of joints is 1Cr18Ni9Ti stainless steel/Fe₂Ti/Ags, s+Cus, s+Fe₂Ti/TiO₂+TiO+Ti₅Si₃+TiSi₂/ceramics when brazing temperature and time are 850℃ and 5min, respectively. The depth of interfacial reactive layer increases and the ratio of matrix phase Ags, s, Cus, s which are in the middle of interface reduces evidently as brazing temperature is very high or holding time is very long.