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Journal of Electronic Materials

, Volume 45, Issue 12, pp 6184–6191 | Cite as

Effect of Plasma Surface Finish on Wettability and Mechanical Properties of SAC305 Solder Joints

  • Kyoung-Ho Kim
  • Junichi Koike
  • Jeong-Won Yoon
  • Sehoon Yoo
Article

Abstract

The wetting behavior, interfacial reactions, and mechanical reliability of Sn-Ag-Cu solder on a plasma-coated printed circuit board (PCB) substrate were evaluated under multiple heat-treatments. Conventional organic solderability preservative (OSP) finished PCBs were used as a reference. The plasma process created a dense and highly cross-linked polymer coating on the Cu substrates. The plasma finished samples had higher wetting forces and shorter zero-cross times than those with OSP surface finish. The OSP sample was degraded after sequential multiple heat treatments and reflow processes, whereas the solderability of the plasma finished sample was retained after multiple heat treatments. After the soldering process, similar microstructures were observed at the interfaces of the two solder joints, where the development of intermetallic compounds was observed. From ball shear tests, it was found that the shear force for the plasma substrate was consistently higher than that for the OSP substrate. Deterioration of the OSP surface finish was observed after multiple heat treatments. Overall, the plasma surface finish was superior to the conventional OSP finish with respect to wettability and joint reliability, indicating that it is a suitable material for the fabrication of complex electronic devices.

Keywords

Plasma surface finish Pb-free solder Sn-3.0Ag-0.5Cu wettability mechanical properties 

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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  1. 1.Welding and Joining R&D GroupKorea Institute of Industrial Technology (KITECH)IncheonKorea
  2. 2.Department of Materials ScienceTohoku UniversitySendaiJapan
  3. 3.Critical Materials and Semiconductor Packaging EngineeringUniversity of Science and Technology (UST)DaejeonKorea

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