Interfacial product of ZrB₂-SiC brazing joint and growth kinetics of reaction layer

The ZrB₂-SiC (ZS) ceramic composite was brazed in vacuum using TiZrNiCu amorphous active filler. Combined with the brazing process in each stage, the interfacial reaction product and the forming mechanism were analyzed by SEM, EDS and XRD. Ti atom is the most active element in the filler metal. Its reaction product distributes along the joint, which having significant effect on microstructure and mechanical property of the joint. Based on diffusion theory and the diffusion of Ti atom in the solid solution layer, the growth behavior of the Zr(s, s) solid solution layer is discribed and the dynamic equations for growth behavior of zirconia solid solution layer are obtained.