Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering

Date

2016-02-23

Author

Çınar, Simge
Chen, Jiahao
Thuo, Martin

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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.

Subject Keywords

Multidisciplinary

URI

https://hdl.handle.net/11511/35360

Journal

SCIENTIFIC REPORTS

DOI

https://doi.org/10.1038/srep21864

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

S. Çınar, J. Chen, and M. Thuo, “Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering,” SCIENTIFIC REPORTS, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35360.