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| Effect of diode-laser parameters on shear force of micro-joints soldered with Sn-Ag-Cu lead-free solder on Au/Ni/Cu pad | |
| 作者单位： | College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics，College of Materials Science and Technology，Nanjing University of Aeronautics and Astronautics，College of Economics and Management，Nanjing University of Aeronautics and Astronautics，College of Automation Engineering，Nanjing University of Aeronautics and Astronautics，College of Materials Science and Technology，Nanjing University of Aeronautics and Astronautics，College of Materials Science and Technology，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China，Nanjing 210016，China，Nanjing 210016，China，Nanjing 210016，China，Nanjing 210016，China，Nanjing 210016，China |
| 摘 要： | 1Introduction With low cost,Sn-Pb alloy has been widely used in electronic packaging on account of its low melting temperature and good wettability on substrates,such as Cu and Au/Ni/Cu pads.However,Pb and its compounds in the Sn-Pb solder are harmful to … |
| 收稿时间： | 12 March 2006 |
Effect of diode-laser parameters on shear force of micro-joints soldered with Sn-Ag-Cu lead-free solder on Au/Ni/Cu pad |
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| Authors: | Jian-xin WANG Song-bai XUE Dian-song FANG Jin-long JU Zong-jie HAN Li-hua YAO |
| Affiliation: | aCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China bCollege of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China cCollege of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| Abstract: | Soldering experiments with Sn-3.5Ag-0.5Cu lead-free solder on Au/Ni/Cu pad were carried out by means of diode-laser and IR reflow soldering methods respectively.The influence of different heating methods as well as output power of diode-laser on shear force of micro-joints was studied and the relationship between the shear force and microstructures of micro-joints was analyzed.The results indicate that the formation of intermetallic compound Ag3Sn is the key factor to affect the shear force and the fine eutectic network structures of micro-joints as well as the dispersion morphology of fine compound Ag3Sn,in which eutectic network band is responsible for the improvement of the shear force of micro-joints soldered with Sn-Ag-Cu lead-free solder.With the increases of output power of diode-laser,the shear force and the microstructures change obviously.The eutectic network structures of micro-joints soldered with diode-laser soldering method are more homogeneous and the grains of Ag3Sn compounds are finer in the range of near optimal output power than those soldered with IR reflow soldering method,so the shear force is also higher than that using IR reflow soldering method.When the output power value of diode-laser is about 41.0 W,the shear force exhibits the highest value that is 70% higher than that using IR reflow soldering method. |
| Keywords: | diode-laser soldering Sn-Ag-Cu lead-free solder shear force microstructure |
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