PS29
電磁浮遊法を用いたスズ融体の表面張力測定
Surface Tension Measurement of Tin Melts Using
Electromagnetic Levitation
下田麟太郎 1, 清宮優作 1, 勝見智紘 1, 小澤俊平 1
Rintaro SHIMODA1, Yusaku SEIMIY 1, Tomohiro KATSUMI1, and Shumpei OZAWA1
1

千葉工業大学

小澤研究室，Ozawa Laboratory, Chiba Institute of Technology #1,

1. Introduction
Among high-temperature melt processes, brazing is greatly affected by wettability due to the large ratio ofsurface area to melt volume. Accurate surface tension of molten tin at different temperatures is necessary tooptimize the brazing process and to elucidate the phenomenon. However, the reported surface tension of tin,
one of the important brazing materials, is dichotomized into a gentle gradient and a steep gradient, and among
the reported values, the gentle gradient side was often measured in a hydrogen atmosphere. In this study, anelectromagnetic levitation apparatus, one of the containerless methods, was used to measure the surface
tension of tin melts more accurately than before by using ultra -pure tin samples.
2. experimental method
Tin samples with a mass purity of 99.99999% (7N) were used and cleaned using hydrochloric acid andacetone. It was set in an electromagnetic levitation apparatus and levitated and melted with Ar-He gas flowing
at 2 L/min. The surface vibration behavior and temperature of the sample were photographed, and the surface
vibration frequency and translational motion frequency were identified from the photographed droplet
images, and the surface tension was calculated.
3. Results and Discussion
The surface tension of a 7N tin melt was measured in an Ar-He atmosphere (● ) and in an Ar-He-H₂atmosphere (●). The surface tension of the tin melt measured in this study decreased linearly with increasing
temperature regardless of the atmosphere. These results were in good agreement regardless of the atmosphere.
The gradient of the surface tension with temperature is relatively large. The hydrogen and oxygen partialpressures were changed, but no change was observed in the measurement results.

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Figure 1. Relation between surface tension of tin melt and measured atmosphere

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