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Co alloying and size effects on solidification and interfacial reactions in the Sn–Zn–(Co)/Cu couples

Published online by Cambridge University Press:  31 January 2011

Yu-chih Huang  and
Sinn-wen Chen
Yu-chih Huang
Affiliation:
Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
Sinn-wen Chen*
Affiliation:
Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 300, Taiwan
*
a)Address all correspondence to this author. e-mail: swchen@mx.nthu.edu.tw
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Abstract

Sn–Zn based alloys are promising as Pb-free solders, and Cu is commonly used in electronic products. Solidification and interfacial reactions of Sn–8.8wt%Zn, Sn–8.8wt%Zn–0.05wt%Co, and Sn–8.8wt%Zn–0.5wt%Co solders on Cu substrates are investigated. Two different masses of solders are used. The degrees of undercooling increase with increasing Co additions in the Sn–8.8wt%Zn alloys. The reaction products evolve with reaction time, and the timing of different reaction stages is influenced by both the minor Co alloying and the mass of solders. In the initial reaction stage, two reaction phases, γ-Cu5Zn8 and ε-CuZn5, are observed in the Sn–8.8wt%Zn/Cu and Sn–8.8wt%Zn-0.05wt%Co/Cu couples, and only the γ-Cu5Zn8 phase is found when the Co addition is up to 0.5 wt%. The reaction layers are thinner with higher Co alloying. The addition of Co into the Sn–Zn alloys consumes Zn, and this depletion of Zn in the Sn–Zn solders is the primary reason for the changes of reaction products and the thinner reaction layers.

Keywords

SolderingZnCo
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 12 , December 2010 , pp. 2430 - 2438
Copyright
Copyright © Materials Research Society 2010

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