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Surface Tension of Molten Ag-Sn and Au-Cu Alloys at Different Oxygen Partial Pressures

다양한 산소분압에 따른 용융 Ag-Sn 및 Ag-Cu 합금의 표면장력

  • Min, Soon-Ki (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Joon-Ho (Department of Materials Science and Engineering, Korea University)
  • 민순기 (고려대학교 신소재공학부) ;
  • 이준호 (고려대학교 신소재공학부)
  • Published : 2009.01.31

Abstract

A semi-empirical method to estimate the surface tension of molten alloys at different oxygen partial pressures is suggested in this study. The surface tension of molten Ag-Sn and Ag-Cu alloys were calculated using the Butler equation with the surface tension value of pure substance at a given oxygen partial pressure. The oxygen partial pressure ranges were $2.86{\times}10^{-12}$$1.24{\times}10^{-9}$ Pa for the Ag-Sn system and $2.27{\times}10^{-11}$$5.68{\times}10^{-4}$ Pa for the Ag-Cu system. In this calculation, the interactions of the adsorbed oxygen with other metallic constituents were ignored. The calculated results of the Ag-Sn alloys were in reasonable accordance with the experimental data within a difference of 8%. For the Ag-Cu alloy system at a higher oxygen partial pressure, the surface tension initially decreased but showed a minimum at $X_{Ag}$ = 0.05 to increase as the silver content increased. This behavior appears to be related to the oxygen adsorption and the corresponding surface segregation of the constituent with a lower surface tension. Nevertheless, the calculated results of the Ag-Cu alloys with the present model were in good agreement with the experimental data within a difference of 10%.

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