Skip to main content

Fast Soldering Reactions on Au Foils

  • P.G. Kim and K.N. TU

We have studied the wetting behaviors and interfacial reactions of Pb‐containing (63Sn‐37Pb, 95Pb‐5Sn) and Pb‐free solders (pure Sn, 96Sn‐4Ag, 57Bi‐43Sn, 77.2Sn‐20In‐2.8Ag) on Au foils in order to understand the role of Pb in Pb‐based solders. Surface morphology, wetting angle, and interfacial reaction of the solders were studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X‐ray Analysis (EDX). Pb‐containing and Pb‐free solders (pure Sn, 96Sn‐4Ag, 77.2Sn‐20In‐2.8Ag) showed rough surfaces due to the precipitation of intermetallic compounds on the surface of the solder caps. The eutectic SnBi (57Bi‐43Sn) solder, however, showed a smoother surface. The wetting angle of the eutectic SnPb (63Sn‐37Pb), pure Sn, 96Sn‐4Ag, and 77.2Sn‐20In‐2.8Ag solders decreased significantly with reflow time, while the eutectic SnBi and 95Pb‐5Sn solders showed a much smaller decrease. A large amount of intermetallic compounds was formed throughout the entire region of the solder cap for the eutectic SnPb, 96Sn‐4Ag, 95Pb‐5Sn, and 77.2Sn‐20In‐2.8Ag, mainly due to the high solubility of Au in these solders. Slow intermetallic compound growth was observed for the eutectic SnBi solder.

Hide All
1 Kim, P.G. and Tu, K.N., J. Appi. Phys., 80(7), p. 3822 (1996).
2 Harding, W. B. and Pressly, H. B., (Am. Electroplat. Soc, 50th Annu. Proc. 1963) p. 60.
3 Mulholland, W. A. and Willyard, D. L., Welding J., Res. SuppL, 54(10), p. 466s (1974).
4 Kehrer, H. P. and Wenzel, E. M., Metall., 30(10), p. 1047 (1979).
5 Duckett, R. and Ackroyd, M. L., Electroplat. Met. Finish., 29(5), p. 13 (1976).
6 Jacobson, D. M., and Jumpston, G., Gold. Bull., 22(1), p. 9 (1989).
7 Thwaites, C. J., Electroplat. Met. Finish., 26(8), p. 10 (1973).
8 Thwaites, C. J., Electroplat. Met. Finish., 26(9), p. 21 (1973).
9 Heinzel, H. and Saeger, K. E., Gold Bull., 9(1), p. 7 (1976).
10 Kim, H. K., Liou, H. K., and Tu, K. N., J. Mater. Res., 10(3), p. 497 (1995).
11 Yost, F. G. and Romig, A. D.. Jr., Mat. Res. Soc.Symp. Proc, 108. p. 385 (1988).
12 Metal Handbook, 9th ed. (American Society for Metals, Metal Park, OH, 1985), 9, p. 416.
13 Prince, A., J. Less‐Common Met., 12, p. 107 (1967).
14 Kubiak, R., J. Less‐Common Met., 80(2), p. 53 (1981).
15 Bader, B. G., Welding Journal, 48(120), p. 551‐s (1969).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Full text views

Total number of HTML views: 0
Total number of PDF views: 1 *
Loading metrics...

Abstract views

Total abstract views: 61 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 17th July 2018. This data will be updated every 24 hours.