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Noncontact surface tension and viscosity measurements of molten oxides with a pressurized hybrid electrostatic-aerodynamic levitator

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3 Author(s)
Ishikawa, Takehiko ; Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan ; Yu, Jianding ; Paradis, Paul-Francois

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In order to measure the surface tension and the viscosity of molten oxides, the oscillation drop technique has been applied on a pressurized hybrid electrostatic-aerodynamic levitator. To suppress the electrical discharge between the top and bottom electrodes, the drop excitation method which has been used with high vacuum electrostatic levitators has been modified. As a demonstration, the surface tension and viscosity of liquid BaTiO3 were measured using this new method. Over the 1500–2000 K interval, the surface tension was measured as γ(T)=349-0.03 (T-Tm) (10-3 N/m), where Tm=1893 K is the melting temperature. Similarly, the viscosity was determined as η(T)=0.53 exp[5.35×104/(RT)](10-3 Pa s) over the same temperature interval.

Published in:

Review of Scientific Instruments  (Volume:77 ,  Issue: 5 )