Wetting kinetics of Sn, eutectic Sn-Ag, eutectic Sn-Cu, and eutectic Pb-Sn was studied using real-time in situ monitoring of the triple-line movement, facilitated by a hot-stage microscopy system under a controlled atmosphere. Significantly different kinetics of lead versus lead-free solders is documented. In case of the eutectic lead solder, four characteristic spreading stages were identified. Spreading of lead-free solders features two stages with a sharp change of the spreading rate at the early stages of rather insignificant spreading. Scanning electron microscopy and energy-dispersive x-ray spectroscopy analysis of the resolidified solder surface within a halo region is discussed.
|Number of pages||8|
|Journal||Journal of Electronic Materials|
|State||Published - Feb 2009|
Bibliographical noteFunding Information:
The authors acknowledge the support of the Kentucky Science and Engineering Foundation through the Grants KSEF-07-RDE-010 and KSEF-829-RDE-007. One of the authors (D.R.N.) acknowledges the support of the UK Center for Manufacturing.
- Lead-free and lead solders
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry