Interfacial reactions in the Sn-20 at. % In/Cu and Sn-20 at. % In/Ni couples at 160 °C

Shih-kang Lin, Sinn Wen Chen

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Sn-In alloys are promising low-melting-point Pb-free solders. Cu and Ni are common substrates in the electronic products. This study examines the interfacial reactions in the Sn-20 at.% In(γ-InSn4) /Cu and Sn-20 at.% In/Ni couples at 160°C. Only the η-Cu6Sn5 phase layer is formed in the Sn-20 at.% In/Cu couple, and the layer grows thicker with longer reaction time. The reaction path is γ-InSn4/η- Cu6Sn5/Cu. A peculiar phenomenon with the bulging of the couple near the Ni substrate is found in the Sn-20 at.% In/Ni couple. A liquid phase is formed by interfacial reaction in the solid/solid Sn-20 at.% In/Ni couple at 160°C, and the reaction path is γ-InSn4/liquid/δ-Ni3Sn4 + liquid/(δ-Ni3Sn4)/Ni. Usually Ni has a slower reaction rate with solders; however, the consumption rates of Ni substrate are much higher than those of Cu substrate in this study when they are in contact with the Sn-20 at.% In alloy at 160°C due to the formation of the liquid phase in the Sn-20 at.% In/Ni couple.

Original languageEnglish
Pages (from-to)1712-1717
Number of pages6
JournalJournal of Materials Research
Volume21
Issue number7
DOIs
Publication statusPublished - 2006 Jul 1

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Surface chemistry
Liquids
Substrates
solders
liquid phases
Soldering alloys
bulging
Reaction rates
Melting point
liquids
reaction time
melting points
reaction kinetics
products
electronics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Interfacial reactions in the Sn-20 at. {\%} In/Cu and Sn-20 at. {\%} In/Ni couples at 160 °C",
abstract = "Sn-In alloys are promising low-melting-point Pb-free solders. Cu and Ni are common substrates in the electronic products. This study examines the interfacial reactions in the Sn-20 at.{\%} In(γ-InSn4) /Cu and Sn-20 at.{\%} In/Ni couples at 160°C. Only the η-Cu6Sn5 phase layer is formed in the Sn-20 at.{\%} In/Cu couple, and the layer grows thicker with longer reaction time. The reaction path is γ-InSn4/η- Cu6Sn5/Cu. A peculiar phenomenon with the bulging of the couple near the Ni substrate is found in the Sn-20 at.{\%} In/Ni couple. A liquid phase is formed by interfacial reaction in the solid/solid Sn-20 at.{\%} In/Ni couple at 160°C, and the reaction path is γ-InSn4/liquid/δ-Ni3Sn4 + liquid/(δ-Ni3Sn4)/Ni. Usually Ni has a slower reaction rate with solders; however, the consumption rates of Ni substrate are much higher than those of Cu substrate in this study when they are in contact with the Sn-20 at.{\%} In alloy at 160°C due to the formation of the liquid phase in the Sn-20 at.{\%} In/Ni couple.",
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Interfacial reactions in the Sn-20 at. % In/Cu and Sn-20 at. % In/Ni couples at 160 °C. / Lin, Shih-kang; Chen, Sinn Wen.

In: Journal of Materials Research, Vol. 21, No. 7, 01.07.2006, p. 1712-1717.

Research output: Contribution to journalArticle

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