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Formation and evolution of intermetallic layer structures at SAC305/Ag/Cu and SAC0705-Bi-Ni/Ag/Cu solder joint interfaces after reflow and aging

  • Yang Liu
  • Joost Meerwijk
  • Liangliang Luo
  • Honglin Zhang
  • Fenglian Sun
  • Cadmus A. Yuan
  • Guoqi Zhang
Article

Abstract

In this paper, the formation and evolution characteristics of the intermetallic compounds (IMCs) in SAC305/Ag/Cu and SAC0705-3.5Bi-0.05Ni/Ag/Cu solder during reflow and 150 °C isothermal aging are investigated. Experimental results indicate that Ag3Sn forms as soon as the SAC305/Ag/Cu solder spheres wetted to the substrates. With increased soldering time, the Ag layer on a Cu substrate dissolved into the molten SAC305 solder and the interfacial IMC consisted of Cu6Sn5. The Ag layers show a faster dissolution rate in SAC0705-3.5Bi-0.05Ni/Ag/Cu than in SAC305/Ag/Cu, which is attributed to a larger concentration gradient of Ag for SAC0705-3.5Bi-0.05Ni/Ag/Cu. The formation and coarsening of a Cu3Sn layer between Cu6Sn5 and the Cu substrate caused the formation of Kirkendall voids and delamination during aging in the SAC305/Ag/Cu. A small addition of Ni in the solder significantly suppressed the formation of a Cu3Sn layer in the SAC0705-3.5Bi-0.05Ni/Ag/Cu, resulting in fewer voids in the soldering interface.

Keywords

Solder Joint Solder Alloy Isothermal Aging Molten Solder Bulk Solder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors would like to thank the Chinese State Key Laboratory of Solid State Lighting for providing the financial and equipment support. Thanks to research and scientific foundation of Heilongjiang education department (No. 12541112) and College Students’ innovative experiment project of Heilongjiang province (No. 201310214035).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yang Liu
    • 1
    • 2
    • 4
  • Joost Meerwijk
    • 5
  • Liangliang Luo
    • 4
  • Honglin Zhang
    • 1
  • Fenglian Sun
    • 1
  • Cadmus A. Yuan
    • 2
    • 3
    • 4
  • Guoqi Zhang
    • 3
    • 5
  1. 1.School of Material Science and EngineeringHarbin University of Science and TechnologyHarbinPeople’s Republic of China
  2. 2.Beijing Research CentreDelft University of TechnologyBeijingPeople’s Republic of China
  3. 3.Institute of SemiconductorsChinese Academy of SciencesBeijingPeople’s Republic of China
  4. 4.State Key Laboratory of Solid State LightingChangzhouPeople’s Republic of China
  5. 5.DIMES Center for SSL TechnologiesDelft University of TechnologyDelftNetherlands

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