The Twenty-seventh Space Utilization Symposium (January 24-25, 2011. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
抄録（英）
Surface tension of molten iron was measured by oscillating droplet method using electromagnetic levitation method in consideration of oxygen partial pressure (Po2) of ambient atmosphere. We successfully measured surface tension of molten iron within a very wide temperature range of over 750K under a well controlled Po2 atmosphere. When the Po2 is controlled at 10(exp -2)Pa, the "boomerang shape" temperature dependence of surface tension was experimentally observed; surface tension was increased and then decreased with increasing temperature. The pure surface tension was measured at the Po2 of 10(exp -2)Pa above 2150K. The temperature dependence of the surface tension did not show liner relationship against temperatures under reducing atmosphere of mixture gas of Ar-He-5%H2 due to the competition between temperature dependence of the Po2 and equilibrium constant of oxygen adsorption.
雰囲気制御下での電磁浮遊法による高温融体の高精度表面張力計測
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