Bibliographic Details
| Title: |
One-Step Fabrication of Al/Sn-Bi Core-Shell Spheres via Phase Separation. |
| Authors: |
Dai, R.1, Zhang, S.G.1 sgzhang@sjtu.edu.cn, Li, J.G.1 |
| Source: |
Journal of Electronic Materials. Dec2011, Vol. 40 Issue 12, p2458-2464. 7p. |
| Subjects: |
Phase separation method (Engineering), Coating processes, Liquid alloys, Electronic packaging, Eutectics, Solder & soldering, Solidification |
| Abstract: |
Al/Sn-Bi core-shell spheres, which have potential for use in advanced electronic packaging, were fabricated in one step via phase separation by spraying liquid (AlBi)Sn alloy into silicone oil. The core-shell spheres changed morphology from three-layer to concentric or eccentric dual-layer type with decreasing melt superheat and increasing oil temperature. The spheres are Al-rich in the core, covered with a Sn-Bi-rich periphery, showing a two-stage melting behavior suitable for electronic packaging. The (Al Bi)Sn alloy was identified through thermal analysis to undergo liquid-phase separation, monotectic reaction, and eutectic reaction one after another during cooling. Finally, the solidification path of (AlBi) Sn alloy was analyzed and was schematically illustrated. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
