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首页> 外文期刊>Journal of Materials Engineering and Performance >Temperature Dependence of Surface Tension of Sn-Ag Alloys
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Temperature Dependence of Surface Tension of Sn-Ag Alloys

机译：Sn-Ag合金表面张力的温度依赖性

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The surface tension of molten Sn-Ag alloys was measured using a specially developed high-accuracy sessile drop apparatus. In this apparatus, a molten sample is dropped onto a R-Al_2O_3 substrate in order to prevent any reaction between the sample and substrate during the heating process. The droplet shape was recorded from two perpendicular directions to confirm its symmetry. The oxygen partial pressure (P_(O_2)) was controlled by a Mg furnace to a value of about 10~(-16) to 10~(-15) Pa. The sample compositions used were Sn-20Ag, Sn-50Ag, and Sn-80Ag (at.%) and were alloyed from pure Sn (99.999%) and Ag (99.99%) in the dropping tube. The accuracy of the experimental results was confirmed by an extremely small scatter. The measured temperature dependence of the surface tension of the molten Sn-50Ag (at.%) alloy indicated a characteristic curve that changed from positive to negative with increasing temperature. Furthermore, the surface tension of the molten Sn-20Ag (at.%) alloy has a temperature dependence that changes from flat to negative, while the Sn-80Ag (at.%) alloy has a negative temperature dependence across the whole temperature range. Based on a theoretical discussion using Butler's equation, these temperature dependencies can be determined by negative straight lines when assuming the surface composition.
机译：熔融的Sn-Ag合金的表面张力是使用专门开发的高精度无柄滴落仪测量的。在该设备中，将熔融样品滴到R-Al_2O_3衬底上，以防止在加热过程中样品和衬底之间的任何反应。从两个垂直方向记录液滴形状以确认其对称性。通过Mg炉将氧分压（P_（O_2））控制在约10〜（-16）至10〜（-15）Pa。使用的样品组成为Sn-20Ag，Sn-50Ag和Sn-80Ag（at。％）和在滴管中由纯Sn（99.999％）和Ag（99.99％）合金化。实验结果的准确性通过极小的散射得到了证实。所测量的熔融Sn-50Ag（at。％）合金表面张力的温度依赖性显示出随温度升高从正变负的特性曲线。此外，熔融的Sn-20Ag（原子％）合金的表面张力具有从平坦变为负的温度依赖性，而Sn-80Ag（原子％）合金在整个温度范围内具有负温度依赖性。基于巴特勒方程的理论讨论，当假设表面成分时，这些温度相关性可以由负直线确定。

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