Field of Expertise: Advanced Material Science
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Field of Expertise: Advanced Material Science | |
Measurement of surface tension by means of electromagnetic levitation Electromagnetic levitation provides an elegant method for noncontact containerless measurement of metallic melts. Such a device has been recently constructed by the thermophysics and metalphysics group at TU Graz, Austria and first investigations of copper in the liquid phase have been carried out. In an electromagnetic levitation device an inhomogeneous high-frequency electromagnetic field is built up inside a levitation coil to heat and position the sample. Induced eddy currents heat up the material into the liquid phase and exert a Lorentz force, pushing it towards regions of lower field strength. The sample is investigated by high-speed cameras and a pyrometer to determine surface tension as a function of temperature. |