Surface tension measurements of industrial alloys
Schmidt-Hohagen, Frank and Egry, Ivan (2006) Surface tension measurements of industrial alloys. In: Solidification and Gravity IV Materials Science Forum, 508. Trans Tech Publications Ltd., Switzerland. pp. 573-578. ISBN 0-87849-991-1.
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Industrial alloys are generally multi-component systems with volatile and highly reactive components. Consequently, their processing in the liquid state requires special precautions. Therefore, an existing electromagnetic-levitation device with a high-vacuum chamber, designed for surface tension measurements was modified and improved. Due to the necessity of an extremely pure experiment-environment the equipment was constructed with special consideration of very low oxygen concentration in the processing atmosphere: Only high-purity helium-hydrogen was used and special care was taken to avoid back-diffusion of air through venting valves. For the measurements of the surface tensions with the help of the oscillating drop technique the temperatures and the video sequences of the levitated, molten alloy were recorded without contact by pyrometer and by high-speed camera, respectively. This method yields the frequencies of the surface oscillations of the sample around the equilibrium shape and - using the modified Rayleigh law - eventually the values of the surface tension. With the help of this method some commercial industrial alloys were processed in the new EML-apparatus for ESA`s Thermolab project. The results of these measurements shall be presented and discussed.
|Document Type:||Contribution to a Collection|
|Title:||Surface tension measurements of industrial alloys|
|Journal or Publication Title:||Solidification and Gravity IV|
|In ISI Web of Science:||No|
|Page Range:||pp. 573-578|
|Publisher:||Trans Tech Publications Ltd., Switzerland|
|Series Name:||Materials Science Forum|
|Keywords:||Industrial alloys, electromagnetic levitation, surface tension, oscillating drop, surface oscillations, Rayleigh law, ESA`s Thermolab project|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialforschung unter Mikro-g (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)|
|Deposited By:||Frank Schmidt-Hohagen|
|Deposited On:||27 Aug 2007|
|Last Modified:||27 Apr 2009 12:56|
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