Effect of bonding condition on microstructure and properties of the Si3N4/Si3N4 joint brazed using Cu-Zn-Ti filler alloy

Si3N4 ceramic was jointed to itself using a filler alloy of Cu-Zn-Ti at 1123-1323K for 15-45 minutes. Ti content in the Cu-Zn-Ti filler alloy is from 5 at.% to 20 at.%. The effect of brazing parameters, such as brazing temperature, holding time and Ti content, on the mechanical properties and the Si3N4/Si3N4 joint was investigated. The results indicated that with increasing brazing temperature, holding time and Ti content, the thickness of the interfacial reaction layer between the filler alloy and the Si3N4 ceramic increases, meanwhile, the size and amount of the reactant products in the filler alloy also increase, leading to an increasing shear strength of the Si3N4/Si3N4 joint.