By means of scanning electron microscope and universal material machine,the interfacial morphology of Sn-9Zn brazed joint was observed,meanwhile,the shear properties of brazed joint of Sn-9Zn system solder were studied.The results show that interface layer(IMC) between Sn-9Zn solder and Cu is leveling serrate consisting of Cu5Zn8.The oxidation of Sn-9Zn decreased its shear property without gas protection.Simultaneous addition of rare RE and Ag or RE and Al could greatly improve the shear strength of brazed ...