Effect of Oxygen on Surface Tension of Liquid Ag-Sn Alloys

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  • Lee Joonho
    Department of Materials Science and Processing, Osaka University
  • Tanaka Toshihiro
    Department of Materials Science and Processing, Osaka University
  • Yamamoto Masaya
    Formerly Graduate Student, Department of Materials Science and Processing, Osaka University
  • Hara Shigeta
    Department of Materials Science and Processing, Osaka University

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Abstract

The effect of oxygen on the surface tension of liquid Ag-Sn alloys used as one of the main components in lead-free soldering alloys was measured by the sessile drop method. The surface tension of liquid Ag-Sn alloys decreased with increasing tin content. The effect of oxygen was investigated for oxygen partial pressure ranging from about 10-17 to 10-12 atm. The effect of oxygen on the surface tension of liquid Ag-Sn alloys is closer to pure tin rather than pure silver. Thermodynamic simulation using Butler's equation showed that the surface of liquid Ag-Sn alloys is enriched with tin. Accordingly, the effect of oxygen adsorption on the surface tension of liquid Ag-Sn alloys was considered to be closer to that of tin than silver.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 45 (3), 625-629, 2004

    The Japan Institute of Metals and Materials

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