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Lead-free solders: Enthalpies of mixing of liquid alloys in the Ag–Ni and Ag–Ni–Sn systems

Published online by Cambridge University Press:  01 May 2006

Usman Saeed ,
Hans Flandorfer  and
Herbert Ipser
Usman Saeed
Affiliation:
Institut für Anorganische Chemie/Materialchemie, Universität Wien, A-1090 Wien, Austria
Hans Flandorfer*
Affiliation:
Institut für Anorganische Chemie/Materialchemie, Universität Wien, A-1090 Wien, Austria
Herbert Ipser
Affiliation:
Institut für Anorganische Chemie/Materialchemie, Universität Wien, A-1090 Wien, Austria
*
a) Address all correspondence to this author. e-mail: hans.flandorfer@univie.ac.at
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Abstract

Partial and integral enthalpies of mixing of liquid Ag–Ni and Ag–Ni–Sn alloys were determined at different temperatures, i.e., at 1500 °C for binary Ag–Ni alloys and at 1000, 1220, and 1400 °C for ternary Ag–Ni–Sn alloys. Two different Calvet-type micro-calorimeters were used for the measurements employing drop calorimetry techniques. The binary data were evaluated by means of a standard Redlich–Kister polynomial fit whereas ternary data were fitted on the basis of an extended Redlich–Kister–Muggianu model for substitutional solutions. No significant temperature dependence could be detected for the ternary enthalpies of mixing. From the experimental ternary data, it was possible to deduce the liquidus isotherm at 1000 °C as well as the extension of the liquid miscibility gap at 1220 and 1400 °C.

Keywords

CalorimetrySolderingLiquid
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1294 - 1304
Copyright
Copyright © Materials Research Society 2006

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References

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