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Journal of KWJS 2007;25(2):82-88.
Published online May 17, 2007.
Sn-40Pb/Cu 및 Sn-3.0Ag-0.5Cu/Cu 솔더 접합계면의 금속간화합물 형성에 필요한 활성화에너지
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Activation Energy for Intermetallic Compound Formation of Sn-40Pb/Cu and Sn-3.0Ag-0.5Cu/Cu Solder Joints
Won-Sik Hong, Whee-Sung Kim, Noh-Chang Park, Kwang-Bae Kim
Abstract
  Sn-3.0Ag-0.5Cu lead free solder was generally utilized in electronics assemblies. But it is insufficient to research about activation energy(Q) that is applying to evaluate the solder joint reliability of environmental friendly electronics assemblies. Therefore this study investigated Q values which are needed to IMC formation and growth of Sn-3.0Ag-0.5Cu/Cu and Sn-40Pb/Cu solder joints during aging treatment. We bonded Sn-3.0Ag-0.5Cu and Sn-40Pb solders on FR-4 PCB with Cu pad(t=80㎛). After reflow soldering, to observe the IMC formation and growth of the solder joints, test specimens were aged at 70, 150 and 170 ℃ for 1, 2, 5, 20, 60, 240, 960, 15840, 28800 and 43200 min, respectively. SEM and EDS were utilized to analysis the IMCs. From these results, we measured the total IMC(Cu?Sn?+Cu₃Sn) thickness of Sn-3.0Ag-0.5Cu/Cu and Sn-40Pb/Cu interface, and then obtained Q values for the IMC(Cu?Sn?+Cu₃Sn) growth of the solder joints.
Key Words: Activation energy, SnAgCu, Intermetallic compound, Solder joints


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