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Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering
Scientific Reports
  • Simge Çınar, Iowa State University
  • Ian Tevis, Iowa State University
  • Jiahao Chen, Iowa State University
  • Martin M. Thuo, Iowa State University
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Phase-change materials, such as meta-stable undercooled (supercooled) liquids, have been widely recognized as a suitable route for complex fabrication and engineering. Despite comprehensive studies on the undercooling phenomenon, little progress has been made in the use of undercooled metals, primarily due to low yields and poor stability. This paper reports the use of an extension of droplet emulsion technique (SLICE) to produce undercooled core-shell particles of structure; metal/oxide shell-acetate (‘/’ = physisorbed, ‘-’ = chemisorbed), from molten Field’s metal (Bi-In-Sn) and Bi-Sn alloys. These particles exhibit stability against solidification at ambient conditions. Besides synthesis, we report the use of these undercooled metal, liquid core-shell, particles for heat free joining and manufacturing at ambient conditions. Our approach incorporates gentle etching and/or fracturing of outer oxide-acetate layers through mechanical stressing or shearing, thus initiating a cascade entailing fluid flow with concomitant deformation, combination/alloying, shaping, and solidification. This simple and low cost technique for soldering and fabrication enables formation of complex shapes and joining at the meso- and micro-scale at ambient conditions without heat or electricity.


This article is published as Çınar, Simge, Ian D. Tevis, Jiahao Chen, and Martin Thuo. "Mechanical fracturing of core-shell undercooled metal particles for heat-free soldering." Scientific Reports 6 (2016), doi:10.1038/srep21864. Posted with permission.

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Creative Commons Attribution 4.0 International
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Macmillan Publishers Limited
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Simge Çınar, Ian Tevis, Jiahao Chen and Martin M. Thuo. "Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering" Scientific Reports Vol. 6 (2016) p. 21864
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