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Title: Interface reaction between electroless Ni–Sn–P metallization and lead-free Sn–3.5Ag solder with suppressed Ni3P formation
Authors: Yang, Ying
Balaraju, J. N.
Huang, Yizhong
Tay, Yee Yan
Shen, Yiqiang
Tsakadze, Zviad
Chen, Zhong
Keywords: DRNTU::Engineering::Materials::Electronic packaging materials
Issue Date: 2014
Source: Yang, Y., Balaraju, J. N., Huang, Y., Tay, Y. Y., Shen, Y., Tsakadze, Z., et al. (2014). Interface reaction between electroless Ni–Sn–P metallization and lead-free Sn–3.5Ag solder with suppressed Ni3P formation. Journal of electronic materials, 43(11), 4103-4110.
Series/Report no.: Journal of electronic materials
Abstract: The voids formed in the Ni3P layer during reaction between Sn-based solders and electroless Ni–P metallization is an important cause of rapid degradation of solder joint reliability. In this study, to suppress formation of the Ni3P phase, an electrolessly plated Ni–Sn–P alloy (6–7 wt.% P and 19–21 wt.% Sn) was developed to replace Ni–P. The interfacial microstructure of electroless Ni–Sn–P/Sn–3.5Ag solder joints was investigated after reflow and solid-state aging. For comparison, the interfacial reaction in electroless Ni–P/Sn–3.5Ag solder joints under the same reflow and aging conditions was studied. It was found that the Ni–Sn–P metallization is consumed much more slowly than the Ni–P metallization during soldering. After prolonged reaction, no Ni3P or voids are observed under SEM at the Ni–Sn–P/Sn–3.5Ag interface. Two main intermetallic compounds, Ni3Sn4 and Ni13Sn8P3, are formed during the soldering reaction. The reason for Ni3P phase suppression and the overall mechanisms of reaction at the Ni–Sn–P/Sn–3.5Ag interface are discussed.
DOI: 10.1007/s11664-014-3306-z
Schools: School of Materials Science & Engineering 
Rights: © 2014 The Minerals, Metals and Materials Society. This is the author created version of a work that has been peer reviewed and accepted for publication in Journal of Electronic Materials, published by Springer on behalf of The Minerals, Metals and Materials Society.  It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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