LIU Yang, ZHANG Hong-lin, XIA Peng, et al. The Evolution of Interracial IMCs in SAC/Cu and SAC-Bi-Ni Solder Joints During Reflow[J]. 2015, 20(5): 65-68.
LIU Yang, ZHANG Hong-lin, XIA Peng, et al. The Evolution of Interracial IMCs in SAC/Cu and SAC-Bi-Ni Solder Joints During Reflow[J]. 2015, 20(5): 65-68.DOI: 10.15938/j.jhust.2015.05.013.
In order to investigate the evolution of intermetallic compounds (IMC) in micro solder joints
this study focused on the IMC evolution in Sn-Ag-Cu (SAC) and Sn-Ag-Cu-Bi-Ni (SAC-BiNi) solder joints under dif- ferent soldering process during reflow. The effect of soldering process parameters
including soldering temperature
reflow time
and cooling condition
on the morphology and IMC grain size was investigated systemically by deep- etching method and Electron Microscope (SEM) observation. Experimental results indicated that soldering temper- ature had remarkable influence on the morphology of IMCs which may lead to different IMC growth behaviors. IMCs formed at higher soldering temperature showed facet-like appearance. The grain size of IMCs increased quickly when the bulk solder was in molten state. Cooling rate had limited effect on the IMCs but significant influence on the microstructure of the bulk solder.