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Highly spherical, mono-sized SnAgCu droplets by pulsated orifice ejection method

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Abstract

Spherical Sn0.3Ag0.7Cu (wt.%) solder droplets with diameter ranging from 70.6 to 334.0 ώm were prepared using pulsated orifice ejection method. Compared with conventional atomization, these droplets are almost completely spherical with a much narrower size distribution. The surface of these droplets is smooth without detectable satellite particles. Furthermore, both the composition and microstructure are homogenous throughout any single droplet regardless of their size. Detailed microstructural analysis shows that nano-sized Ag3Sn particles are distributed homogenously in the β-Sn matrix. The results suggest that the droplets have advantage as electronic packaging material and be a promising candidate material for three-dimensional printing.

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ACKNOWLEDGMENTS

This work is supported by Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (No. TP2014042), People’s Republic of China, the National Natural Science Foundation of China (Numbers 51171105 and 51671123), Natural Science Foundation of Liaoning Province (No. 2013020114), 085 project in Shanghai University, People’s Republic of China, and Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, People’s Republic of China.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, People’s Republic of China

    Bingge Zhao, Huijun Ji, Quanliang Zhang, Ling Zhang, Mannan Wu, Qijie Zhai & Yulai Gao

  2. School of Materials Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, Liaoning Province, 116024, People’s Republic of China

    Wei Dong

  3. Laboratory for Microstructures, Shanghai University, 99 Shangda Road, Shanghai, 200444, People’s Republic of China

    Bingge Zhao, Huijun Ji, Quanliang Zhang, Ling Zhang, Mannan Wu & Yulai Gao

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  1. Bingge Zhao
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  2. Wei Dong
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  3. Huijun Ji
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  4. Quanliang Zhang
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  5. Ling Zhang
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  7. Qijie Zhai
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  8. Yulai Gao
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Correspondence to Wei Dong or Yulai Gao.

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Zhao, B., Dong, W., Ji, H. et al. Highly spherical, mono-sized SnAgCu droplets by pulsated orifice ejection method. MRS Communications 7, 709–714 (2017). https://doi.org/10.1557/mrc.2017.65

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