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Experimental Study of the Solder Paste Jet Printing Process Using High Speed Photography and Rheological Methods

  • Saipeng Li
  • Jian Hao
  • Jian ZhouEmail author
  • Feng Xue
Article
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Abstract

The jet printing process of Sn-58Bi lead-free solder paste involving expansion, necking, pinch-off and satellite droplet formation was observed and analyzed with the aid of high-speed photography. The viscosity and phase angle of the solder paste at three temperatures were measured using a rheometer. Spattering behavior of the solder paste was observed at 55°C. The spatter on the substrate came from a second satellite droplet which was produced in the second pinch-off of the solder paste and collided with the nozzle. Satellite droplets were produced at three temperatures when droplets break off, and the number of satellite droplets was determined at each temperature. The appropriate temperature could reduce the viscosity of the solder paste and improve the liquid-like behavior, which is conducive to realizing the jet printing process with an ideal ratio of height to diameter of the solder joints. According to the demand for jet solder paste, high-speed photography and rheological methods can help establish the relationship between jet printing performance and materials design.

Keywords

Lead-free solder pastes jet printing microfluidics high-speed photography droplet spatter satellite droplet 
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Notes

Acknowledgments

The authors would like to thank the National Natural Science Foundation of China (51004039), Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (ASMA201602) and Open Fund of Key Laboratory of Materials Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology No. 56XCA17006-1. The authors also wish to thank Dr. Jie Zhu at Jiangsu University of Science and Technology for his help on the high-speed photography.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjingChina
  2. 2.Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjing Institute of TechnologyNanjingChina

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