Brazing of zirconia with AgCuTi and SnAgTi active filler metals

The self-brazing of partially stabilized zirconia using Ag27Cu3Ti and Sn10A g4Ti active filler metals is investigated. It was shown that the contact an gles of Ag27Cu3Ti and Sn10Ag4Ti on zirconia decreased with the increase of brazing temperature and remained constant at about 34 deg and 44 deg above 900 degrees C, respectively. The flexural strengths were 227 and 137 MPa fo r ZrO2/Ag27Cu3Ti/ ZrO2 and ZrO2/Sn10Ag4Ti/ZrO2, respectively, after brazing at 900 OC for 10 minutes. In these brazing systems, the titanium in the filler metals segregated at t he interface and formed a TiO reaction layer responsible for the wetting an d bonding when a ZrO2 ceramic is brazed with Ag27Cu3Ti and Sn10Ag4Ti filler metals. interfacial analyses by electron probe microanalysis (EPMA) showed that such TiO reaction layers of Zro(2)/Ag27Cu3Ti and ZrO2/Sn10Ag4Ti posse ssed similar thicknesses at the same brazing condition, implying that the T iO interfacial reaction layers of both brazing systems were of the same nat ure and formation kinetics.