Title: Normal Spectral Emissivity Near 680 nm at Melting and in the Liquid Phase for 18 Metallic Elements
Citation: AIP Conference proceedings vol. 1552 p. 704 - 709
Publisher: American Institute of Physics
Publication Year: 2013
JRC N°: JRC68534
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC68534
DOI: 10.1063/1.4819628
Type: Articles in periodicals and books
Abstract: Optical and thermophysical properties of pure metals at the melting point and in the liquid phase are of general interest for technological applications. This is especially true for those metals that are commonly applied. Many of these elements are used either in their pure form or as alloying components. Due to their widespread use in industry an ongoing need for new and more accurate data exists. Based on an ohmic pulse-heating apparatus, properties of conducting materials can be obtained from temperatures of about 1200 K, at which most metals are in the solid state, up to about 5000 K in the liquid state. To enable a fast and accurate temperature measurement over such a vast range, pyrometric temperature detection based on Planck’s radiation law is employed. Furthermore, a microsecond-resolution ellipsometric device with no moving parts, called µs-DOAP (Division-of-Amplitude-Photopolarimeter) as first described by Azzam [1], is applied to measure normal spectral emissivity close to the wavelength of the pyrometer (650 nm). In the present paper, measurements of normal spectral emissivity at 684.5 nm, obtained by means of the above-mentioned pulse-heating technique combined with a µs-DOAP, are summarized for 18 metals, namely cobalt (Co), copper (Cu), gold (Au), hafnium (Hf-3%Zr), iron (Fe), iridium (Ir), molybdenum (Mo), nickel (Ni), niobium (Nb), palladium (Pd), platinum (Pt), rhenium (Re), silver (Ag), tantalum (Ta), titanium (Ti), tungsten (W), vanadium (V), zirconium (Zr). The results are very important in order to eliminate uncertainties arising from the unknown behavior of emissivity at melting and in the liquid phase when investigating temperature-dependent thermophysical properties.
JRC Directorate:Nuclear Safety and Security

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