日本金属学会誌

J. Japan Inst. Metals, Vol. 65, No. 1 (2001),
pp. 21-28

Dependence of Surface Tension of Molten Tin on Temperature and Oxygen Partial Pressure

Zhangfu Yuan1, Kusuhiro Mukai1, Katsuhiko Takagi2 and Masahiko Ohtaka1

1Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
2National Space Development Agency of Japan, Tsukuba 305-8505

Abstract:

The surface tension of molten tin has been determined by the sessile drop method at temperatures ranging from 523 to 1033 K and in the range of oxygen partial pressure, PO2, from 2.85{×}10-19 to 8.56{×}10-6 MPa.
At PO2=2.85{×}10-19 and 1.06{×}10-15 MPa, the surface tension of molten tin decreases linearly with increasing temperature and the temperature coefficients were (∂σ/∂{T})PO_{2}=-0.151, -0.094 mN⋅m-1⋅K-1, respectively. At higher oxygen partial pressure (PO2=3.17{×}10-10, 8.56{×}10-6 MPa), the surface tension increases with increasing temperature near the melting point (505 K). However, at temperatures ranging from 723 to 1033 K, the surface tension decreases with increasing temperature. Consequently, dependence of the surface tension decrease with PO2 in the vicinity of the melting point is pretty large in comparison with that at temperatures ranging from 823 to 1023 K. The observed results were explained qualitatively based on a model proposed by Passerone et al.21) which incorporates both thermodynamic and kinetic considerations.


(Received July 27, 2000)

Keywords:

molten tin, surface tension, temperature coefficient of surface tension, oxygen partial pressure, sessile drop method


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