| Ag-22.4Cu-20Sn solder alloy was prepared by D-KH method and casting. XRD, SEM, DSC and mechanical testing were used to study phase compositions, microstructures, melting properties, shear strengths of brazed joints and other related properties in comparison with solder alloy prepared by casting. The results show that phases of Ag-22.4Cu-20Sn solder ribbon made by D-KH are (Ag),Cu3Sn and Ag5Sn while the phases of the solder made by casting are (Ag),Cu3Sn, Ag5Sn and Cu41Sn11. Thus in comparison with the solder made by casting the melting characteristics are so different, such as the solidus temperature to be lower and melting range were reduced. Under the same condition, the wetting and spreading properties of solder alloy made by D-KH with 0.1 mm thickness are super. Simultaneously, shear strength of the joint is higher and stability is better. |
