Reaction properties and interfacial intermetallics for Sn?xAg?0.5Cu solders as a function of Ag content |
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Authors: | Jong-Hyun Lee A-Mi Yu Jeong-Han Kim Mok-Soon Kim Namhyun Kang |
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Affiliation: | 1.Department of Materials Science and Engineering,Seoul National University of Technology,Seoul,Korea;2.Advanced Joining Technology Team,Korea Institute of Industrial Technology,Incheon,Korea;3.School of Materials Science & Engineering,Inha University,Incheon,Korea;4.Department of Materials Science & Engineering,Pusan National University,Busan,Korea |
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Abstract: | Wetting and interfacial reactions were investigated for Sn−xAg−0.5Cu alloys, in which the Ag content had a variation from
x=1.0 to x=4.0. Differential scanning calorimetry (DSC) was used to investigate the range of the melting temperature and the
solidification temperature by measuring the endothermic and the exothermic heat flow, respectively. Low Ag contents increased
the melting temperature ranges and deteriorated the wetting properties such as zero cross time and wetting force measured
at two seconds. The extent of undercooling increased and the thickness of intermetallic compounds (IMC) decreased as the Ag
content decreased. As the Ag content decreased, the initial IMC thickness decreased due to the large undercooling and, during
the solid aging at 170°C, the IMC growth slightly decelerated because of the small diffusion coefficient. For the application
of good drop shock reliability, Sn−Ag−Cu solder of low Ag content should be beneficial due to the restraint of the IMC growth
(Cu6Sn5 and Cu3Sn) and of the coarse plate-like IMC (Ag3Sn). |
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Keywords: | Pb-free solder Sn− Ag− Cu alloy wetting undercooling intermetallic compound (IMC) |
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