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We successfully fabricated an eco-friendly Cu-Zn wetting layer for Sn-Ag-Cu (SAC) solders by electroplating in a cyanide-free solution. The reliabilities of solder joints formed on the Cu-Zn solder wetting layer were evaluated through the drop impact test and thermal cycling (T/C) test. First, boardlevel drop impact test was performed with the SAC solder joints formed on electroplated Cu or Cu-Zn...
In this study, the interfacial reaction between Sn-3.0Ag-0.5Cu solder on Cu-35wt%Zn, Cu-20wt%Zn-15wt%Ni and Cu-25wt%Zn-10wt%Ni substrates were studied after reflow at 250°C for 90s and isothermal aging at 150°C for 50, 100, 250, and 500h. Addition of Zn or Ni into Cu wetting layer was effective to suppress the excessive growth of IMC and avoid the microvoids formation after thermal aging. In the initial...
We developed an Au/Ni-Zn/Ti under bump metallurgy (UBM) for Pb-free solders. Au/Ni-Zn/Ti and Au/Ni/Ti UBM stacks were deposited on SiO2/Si wafer using conventional magnetron sputtering and Sn solder was electroplated on UBM stacks. Then, Sn solder on UBM were reflowed at 260°C for 15 s and aged at 150°C up to 1000 h. The measurement of film stress using a curvature method showed Ni-Zn films having...
The excessive growth of intermetallic compound (IMC) and the formation of microvoids in the interface between Sn-Ag-Cu (SAC) solder and Cu substrate have been a serious problem which may degrade the solder joints reliability. Recently, a new Cu-Zn alloy solder wetting layer for the Pb-free solders has been developed to reduce the IMC growth rate. In this paper, the kinetics of IMC growth and the shear...
The intermetallic growth in the Sn-Ag-Cu (SAC) solder joints fabricated on Cu or Cu-Zn solder wetting layer and its effect on the drop impact reliability have been studied. The drop test specimens were fabricated by connecting two printed circuit boards by reflowing SASC 405 solder balls on Cu or Cu-Zn wetting layers. And the drop test specimens were aged at 150degC up to 500 hrs. The well known bi-layer...
We recently developed Cu-Zn alloy wetting layer for the SAC solder balls to improve the reliability. In this paper, IMC formation and solder joint reliability have been investigated in the solder joint between SAC solder balls and Cu-Zn alloy pads, and Cu pads were also used as a reference. Sn-4.0Ag-0.5 Cu solder balls were used and the substrates were Cu and 80 wt% Cu-20 wt% Zn pads which were defined...
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