Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15938
Title: Microstructure, kinetic analysis and hardness of Sn-Ag-Cu-1 wt% nano-ZrO2 composite solder on OSP-Cu pads
Authors: Gain, AK
Fouzder, T
Chan, YC
Yung, WKC 
Keywords: Hardness
Kinetics analysis
Microstructure
Nano doping
Issue Date: 2011
Publisher: Elsevier
Source: Journal of alloys and compounds, 2011, v. 509, no. 7, p. 3319-3325 How to cite?
Journal: Journal of alloys and compounds 
Abstract: Nano-sized, nonreacting, noncoarsening ZrO2 particle-reinforced Sn-Ag-Cu composite solders were prepared by mechanically dispersing ZrO 2 nano-particles into Sn-Ag-Cu solder and the interfacial morphology between the solder and organic solderability preservative (OSP)-Cu pads were characterized metallographically. At their interfaces, island-shaped Cu 6Sn5 and Cu3Sn intermetallic compound (IMC) layers were found in solder joints with and without the ZrO2 particles and the IMC layer thickness was substantially increased with reaction time and temperature. In the solder ball region, needle-shaped Ag3Sn and spherically-shaped Cu6Sn5 IMC particles were found to be uniformly distributed in the β-Sn matrix. However, after the addition of ZrO2 nano-particles, Ag3Sn and Cu6Sn 5 IMC particles appeared with a fine microstructure and retarded the growth rate of the IMC layers at their interfaces. From a kinetic analysis, the calculated activation energies for the total (Cu6Sn5 + Cu3Sn) IMC layers for Sn-Ag-Cu and Sn-Ag-Cu-1 wt% ZrO2 composite solder joints on OSP-Cu pads were about 53.2 and 59.5 kJ/mol, respectively. In addition, solder joints containing ZrO2 nano-particles displayed higher hardness due to the uniform distribution of ZrO2 nano-particles as well as the refined IMC particles. The hardness values of the plain Sn-Ag-Cu solder joint and solder joints containing 1 wt% of ZrO2 nano-particles after 5 min reaction at 250 °C were about 15.0 Hv and 17.1 Hv, respectively. On the other hand, their hardness values after 30 min reaction were about 13.7 Hv and 15.5 Hv, respectively.
URI: http://hdl.handle.net/10397/15938
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2010.12.048
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