Abstract
The microstructure and shear property of Cu/Sn–xZn/Cu (x = 0, 2, 5, 9, 30, 70 wt.%) composite solder joints fabricated by transient liquid phase (TLP) bonding were investigated. The results showed that the appropriate amount of Zn particles inhibited Cu6(Sn, Zn)5 phase formation at the Cu/solder interface. The Zn particles can improve the interface IMC morphology of composite solder joints, the interface IMC thickness of Cu/Sn–30Zn/Cu solder joint is only 3.89 μm, and the excessive (30–70 wt.%) Zn particles are harmful to the composite solder joints. Doping 2–9 wt.% Zn particles can improve the shear strength. The maximum shear strength value of the Cu/Sn–9Zn/Cu composite solder joint reaches 14.18 MPa. The fracture mechanism is mainly ductile brittle mixed fracture, which occurs near the Interface reaction zone.
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This research was financially supported by by the National Natural Science Foundation of China (Grant nos. 51865006 and 52165068), Guangxi Natural Science Foundation Project (Grant No. 2020GXNSFAA297004) and Middle-aged and Young Teachers' Basic Ability Promotion Project of Guangxi (Grant No. 2021KY0787).
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Liu, Z., Wang, X.Y., Yang, L. et al. Microstructure and Shear properties of Sn–xZn Transient Liquid Phase Bonding in 3D-Chip Stacking Packaging. Trans Indian Inst Met 76, 2757–2763 (2023). https://doi.org/10.1007/s12666-022-02866-1
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DOI: https://doi.org/10.1007/s12666-022-02866-1