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Optical and thermodynamic property measurements of liquid metals and alloysOptical properties and spectral emissivities of liquid silicon, titanium, niobium, and zirconium were investigated by HeNe laser polarimetry at 632.8 nm. The metals were of a high purity and, except for zirconium, clean. The more demanding environmental requirements for eliminating oxide or nitride phases from zirconium were not met. Containerless conditions were achieved by electromagnetic levitation and heating. CO2 laser beam heating was also used to extend the temperature range for stable levitation and to heat solid silicon to form the metallic liquid phase. Corrections to previously reported calorimetric measurements of the heat capacity of liquid niobium were derived from the measured temperature dependence of its spectral emissivity. Property measurements were obtained for supercooled liquid silicon and supercooling of liquid zirconium was accomplished. The purification of liquid metals and the extension of this work on liquids to the measurement of thermodynamic properties and phase equilibria are discussed.
Document ID
19910068784
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Weber, J. K. R.
(Intersonics, Inc. Northbrook, IL, United States)
Krishnan, Shankar
(Intersonics, Inc. Northbrook, IL, United States)
Schiffman, Robert A.
(Intersonics, Inc. Northbrook, IL, United States)
Nordine, Paul C.
(Intersonics, Inc. Northbrook, IL, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 7, 19
ISSN: 0273-1177
Subject Category
Materials Processing
Accession Number
91A53407
Distribution Limits
Public
Copyright
Other

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