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Showing papers on "Sessile drop technique published in 1970"


Journal ArticleDOI
S. K. Rhee1
TL;DR: In this article, the surface tension of liquid aluminum varies linearly with temperature: γLv (dynes/cm) = 948−0.202T (°K).
Abstract: The wettability of AlN, TiB2, TiN, and TiC by liquid aluminum was investigated by the sessile drop technique at 2×10-7 torr or less. The contact angle decreased linearly with increasing temperature in all cases. Variation of the contact angle with temperature is correlated with the surface tension of the drop, and the Zisman-type relation is established. The critical surface tensions (Rγc) of AlN, TiB2, TiN, and TiC are 664, 700, 713, and 725 dynes/cm, respectively. These values are correlated with the melting point of the ceramics. The Zisman relation is discussed and applied to calculation of the work of adhesion. The surface tension of liquid aluminum varies linearly with temperature: γLv (dynes/cm) = 948–0.202T (°K).

181 citations


Journal ArticleDOI
S. K. Rhee1
TL;DR: In this article, the cosine of the contact angle and the temperature or surface tension of the liquid drop were investigated. And the critical surface tension for spreading and its physical significance were discussed.
Abstract: The wetting of AlN and TiC by liquid Ag and liquid Cu was investigated by the sessile drop technique at 10−6 torr or less. An empirical relation was established between the cosine of the contact angle and the temperature or surface tension of the liquid drop. The critical surface tension for spreading and its physical significance are discussed. A method for estimating the surface energies of ceramics is proposed. The surface tension of TiC is estimated to be 1242±158 dynes/cm and that of AlN 990±110 dynes/cm. The surface tension of liquid Ag followed the equation γLv (Ag) (dynes/cm) = 1092–0.14T (°C) and that of liquid Cu γLV (Cu) (dynes/cm) = 1462–0.27T (°C).

77 citations


Journal ArticleDOI
TL;DR: The surface free energies of In, Ga, and Sn were 540, 632, and 573 ergs/cm2 (± 5%), respectively, at their melting points as discussed by the authors.
Abstract: Contact angles, surface free energies, and work of adhesion were determined by a sessile drop technique for the wetting of MgO, Al2O3, and SiO2 by In, Ga, and Sn at 10-10 torr. The surface free energies of In, Ga, and Sn were 540, 632, and 573 ergs/cm2 (±5%), respectively, at their melting points. Works of adhesion and equilibrium contact angles for wetting of MgO by In are 172 ergs/cm2 and 133° by Ga, 356 ergs/cm2 and 116° by Sn, 278 ergs/cm2 and 121°. For wetting of Al2O3 by In, they are 237 ergs/cm2 and 124° by Ga, 226 ergs/cm2 and 130° by Sn, 257 ergs/cm2 and 123°. For wetting of SiO2 by In, they are 208 ergs/cm2 and 128° by Ga, 260 ergs/cm2 and 126° by Sn, 252 ergs/cm2 and 124°.

43 citations


Journal ArticleDOI
01 Jan 1970
TL;DR: The surface tension of liquid Fe-Y and Fe-C-Y alloys containing 0 to 2 wt pct C and up to 8 wt Pct Y were measured at 1550°C with a sessile drop technique as discussed by the authors.
Abstract: The surface tensions of liquid Fe-Y and Fe-C-Y alloys containing 0 to 2 wt pct C and up to 08 wt pct Y were measured at 1550°C with a sessile drop technique Yttrium was found to be surface active in both Fe-Y and Fe-C-Y alloys in the composition ranges studied The addition of carbon reduces the surface tension of Fe-Y alloys

7 citations




Journal ArticleDOI
TL;DR: In this article, an apparatus has been constructed for contact angle measurements between liquid metals and solids, and for measurement of the surface tension of liquid metals at high temperature by the sessile drop method.
Abstract: An apparatus has been constructed for contact angle measurements between liquid metals and solids, and for measurement of the surface tension of liquid metals at high temperature by the sessile drop method. Measurements may be performed under dynamic vacua better than 1 μtorr to at least 1600°C, or under a reduced pressure of inert gas.

1 citations