Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Material Property Evaluation of High Temperature Creep on Pb-free Solder Alloy Joint to Reflow Time by Shear Punch-creep Test

전단펀치-크리프 시험에 의한 리플로우 시간별 Pb-free 솔더 합금 접합부에 대한 고온 크리프 물성 평가

  • Ham, Young Pil (Mechanical System Engineering, Chonbuk National University) ;
  • Heo, Woo Jin (Molding Machines Division, LS Mtron) ;
  • Yu, Hyo Sun (Mechanical System Engineering, Chonbuk National University) ;
  • Yang, Sung Mo (Mechanical System Engineering, Chonbuk National University)
  • 함영필 (전북대학교 기계시스템공학부) ;
  • 허우진 (LS 엠트론 사출시스템사업부) ;
  • 유효선 (전북대학교 기계시스템공학부) ;
  • 양성모 (전북대학교 기계시스템공학부)
  • Received : 2012.07.27
  • Accepted : 2012.08.23
  • Published : 2013.01.01
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Abstract

In this study, shear punch-creep (SP-Creep) at Sn-4Ag/Cu pad the joint was tested by using environment-friendly Pb-free solder alloy Sn-4Ag of electronic components. Pb eutectic alloy (Sn-37Pb) joints limited to environmental issues with reflow time (10sec, 30sec, 100sec, 300sec) according to two types of solder alloy joints are compared and evaluated by creep strain rate, rupture time and IMC (Intermetallic Compound) behavior. As the results, reflow time increases with increasing thickness of IMC can be seen at overall 100sec later in case of two solder joints on the IMC thickness of Sn-4Ag solder joints thicker than Sn-37Pb solder joints. In addition, when considering creep evaluation factors, lead-free solder alloy Sn-4Ag has excellent creep resistance more than Pb eutectic alloy. For this reason, the two solder joints, such as in the IMC (Cu6Sn5) was formed. However, the creep resistance of Sn-4Ag solder joints was largely increased in the precipitation strengthening effect of dispersed Ag3Sn with interface more than Sn-37Pb solder joints.

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References

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