Effects of α-Al2O3 nanoparticles-doped on microstructure and properties of Sn–0.3Ag–0.7Cu low-Ag solder

  • Jie Wu
  • Songbai Xue
  • Jingwen Wang
  • Mingfang Wu
  • Jianhao Wang


In order to enhance the properties of Sn–0.3Ag–0.7Cu low-Ag solder, α-Al2O3 nanoparticles with various content (0–0.5 wt%) were successfully doped into the solder paste with a self-designed dispersion step. After comprehensive study of the microstructures and properties of the novel nano-composite solder, several satisfactory modified results can be obtained. For instance, the wettability of solder was greatly improved with trace amount of α-Al2O3 nanoparticles-doped. The superior wettability was achieved by Sn–0.3Ag–0.7Cu–0.12Al2O3 solder with spreading area approaching to ~ 79 mm2. Detailed thermodynamic and kinetic analysis of how α-Al2O3 nanoparticles promoting the processes of solder wetting and spreading on Cu substrate were given. In addition, the joint soldered with Sn–0.3Ag–0.7Cu–0.12Al2O3 displayed the highest shear force (57.1 N) with a typical ductile fracture failure mode. This relates to the evidently refined microstructure as well as the well-controlled growth of interfacial Cu6Sn5 IMCs. Corresponding theoretical analysis shows 0.12 wt% Al2O3 nanoparticles-doped can decrease the growth rate constant of interfacial Cu6Sn5 IMCs from 5.08 × 10−10 to 1.71 × 10−10 cm2/s.



This project is supported by National Natural Science Foundation of China (Grant No. 51675269) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).


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Authors and Affiliations

  1. 1.College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjingPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringJiangsu University of Science and TechnologyZhenjiangPeople’s Republic of China

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