Study of Critical Factors Influencing the Solidification Undercooling Behavior of Sn-3.0Ag-0.5Cu(SAC)Lead-free Solder and SAC/Cu Joints
The solidification behavior of Sn-3.0Ag-0.5Cu solders and Sn-3.0Ag-0.5Cu/Cu joints was investigated by using differential scanning calorimetry (DSC) incorporated into the reflow process.The critical factors influencing the undercooling behavior of the solders and joints,such as the solder size,composition and substrate size,were examined.The results show that the type of the primary solidification phase and its volume fraction are the dominant factors affecting the undercooling of the solders and joints,and the degree of undercooling of the solders and joints increases inversely with the solder volume (joint size).For the same solder size (volume),when Cu6Sn5 is the primary solidification phase,the degree of undercooling of Sn-3.0AgxCu( x≥0.5wt.%)/Cu joints increases with increasing the substrate size and decreases with increasing the volume fraction of Cu6Sn5.The factors influencing the undercooling of solder joints are complicated,and the composition of the solder matrix is the dominant factor affecting the undercooling of the Sn-3.0Ag-xCu/Cu joints made of the solders with hypoeutectic compositions,while the substrate size plays the dominant role when the Cu content exceeds its eutectic composition.
Xun-Ping Li Jian-Min Xia Hong-Bo Qin Xiao-Qi He Xin-Ping Zhang
School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Ch School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Ch Science and Technology on Reliability Physics and Application of Electronic Component Laboratory,the
国际会议
桂林
英文
356-360
2012-08-13（万方平台首次上网日期，不代表论文的发表时间）