Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 37, Issue 2, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10765-015-2023-z
Keywords
Copper; Cu-5Sn; Electromagnetic levitation; Liquid alloy; Oscillating drop; Surface tension; Tin
Funding
- Austrian Science Fund (FWF), Vienna, Austria [P23838-N20]
- Austrian Science Fund (FWF) [P 23838] Funding Source: researchfish
- Austrian Science Fund (FWF) [P23838] Funding Source: Austrian Science Fund (FWF)
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The surface tension of liquid Cu-5Sn (copper with 5wt% tin) in the temperature range from 1290 K to 1560 K was measured by an oscillating drop technique combined with electromagnetic levitation. The levitation device uses an inhomogeneous radiofrequency electromagnetic field inside a levitation coil to position and to heat metallic material. Eddy currents are induced in a specimen to heat it to the liquid phase and to exert a Lorentz force, pushing it against gravity towards regions of lower field strength. The levitating liquid specimen takes the shape of a sphere, which is rotating and oscillating. The oscillations are recorded by a high-speed camera at 600 fps; the temperature of the specimen is measured by a fast near-infrared pyrometer. A linear fit to the measured surface tension gamma of Cu-5Sn as a function of temperature T in Kelvin is given by: gamma(T)(mN . m(-1)) = 1195 - 0.052 . (T - 1318).
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