Brazing of aluminum matrix composites SiC_p/ZL101 to Kovar alloy 4J29

SiC_pZL101 composites containing 55% SiC_p and Kovar alloy 4J29 were chosen as base metals.After being e-lectroplated by Ni on the SiC_p/ZL101,the two materials were brazed by Zn-Cd-Ag as filler metal at the 420℃ for 7 min.Mo-reover,the interfacial microstructures and fracture appearances were investigated by SEM and EDS.The results show that the e-lectroplated Ni on the surface of SiC/ZL101 can improve the filler's wettability to the composite material.There are transition layers not only between the filler and Kovar alloy,but also be-tween the filler and the electroplated Ni layer,which shows the filler metal,the electroplated Ni layer,the composites and Kovar alloy can realize metallurgically joining by diffusion.The fracture analysis shows that the fracture happens inside the composites near the electroplated Ni layer.