Formation Enthalpy, Free-Energy and Activity Coefficients of Sn-Pb Eutectic Solders

Abstract:

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Based on Miedema’s model, the enthalpy of formation, excess free-energy and partial molar excess free-energy of Sn-Pb binary alloy solders were calculated. The model of the activity coefficient for each component in the solders was established. The diagrams of enthalpy of formation, free energy versus composition and activity versus composition and temperature as well as activity coefficients as a function of composition and/or temperature were drawn. And then the relationship between the activity coefficients of elements Sn/Pb in the solders and temperature was obtained. The approaches to reduction in the volatilization of lead at high temperature were proposed from the point of views that the lead pollution to environment results from its chemical activity in the solder alloys.

Info:

Periodical:

Materials Science Forum (Volumes 610-613)

Main Theme:

Edited by:

Zhong Wei Gu, Yafang Han, Fu Sheng Pan, Xitao Wang, Duan Weng and Shaoxiong Zhou

Pages:

531-536

DOI:

10.4028/www.scientific.net/MSF.610-613.531

Citation:

G. S. Gan et al., "Formation Enthalpy, Free-Energy and Activity Coefficients of Sn-Pb Eutectic Solders ", Materials Science Forum, Vols. 610-613, pp. 531-536, 2009

Online since:

January 2009

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Price:

$35.00

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