NDLI: Spectral Emissivities and Emissivity X-Points of Pure Molybdenum and Tungsten

Content Provider	Springer Nature Link
Author	Cagran, C. Pottlacher, G. Rink, M. Bauer, W.
Copyright Year	2005
Abstract	Prediction methods for thermophysical properties of metals and alloys such as emissivity are of great interest not only for science but also for the metal working industry as time-consuming and often expensive measurements may not be required. As recent results have shown, an assumed Hagen–Rubens relation for the prediction of emissivity based on electrical resistivity results was not found in the visible spectra. Within this work normal spectral emissivity results obtained with two complete different techniques are presented. On one hand, a multi-wavelength-pyrometry (MWLP) approach has been used to obtain emissivity as a function of temperature at 684.5, 902, and 1570 nm, and on the other hand, a radiance-comparison method was used to obtain emissivity isotherms as a function of wavelength for a range starting from 1 to 24 μm. From results of the radiance-comparison measurements an intersection of the isotherms, often referred to as the emissivity x-point, was found for both investigated materials, tungsten and molybdenum. According to these results, the x-point wavelengths are given by λ $_{x}$ = 1.41 μm for tungsten and λ $_{x}$ = 1.55 μm for molybdenum. Based on these x-points and the MWLP measurements, a new prediction method for the liquid-phase behavior of emissivity is developed and discussed.
Starting Page	1001
Ending Page	1015
Page Count	15
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	26
Issue Number	4
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	emissivity x-point molybdenum multi-wavelength pyrometry normal spectral emissivity radiance comparison tungsten Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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