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TECHNICAL PAPERS

Concentrated Solar Energy as a Diagnostic Tool to Study Materials Under Extreme Conditions

[+] Author and Article Information
M. Balat-Pichelin, D. Hernandez, G. Olalde, B. Rivoire, J. F. Robert

Institut de science et de génie des Matériaux et Procédés (IMP-CNRS), BP 5, Odeillo, 66125 Font-Romeu Cedex, France

J. Sol. Energy Eng 124(3), 215-222 (Aug 01, 2002) (8 pages) doi:10.1115/1.1488164 History: Received February 01, 2001; Revised February 01, 2002; Online August 01, 2002
Copyright © 2002 by ASME
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References

Figures

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MESOX experimental set-up: 1) silica vessel, 2) CaF2 viewports, 3) sample, 4) flowmeter, 5) pressure regulator, 6) vacuum pump, 7) pressure gauge, 8) microwave generator, 9) water-cooled waveguide, 10) shutter, 11) fixed mirrors, 12) rotating mirror, and 13) optical pyrometer
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Theoretical and experimental transitions in the oxidation of sintered SiC under molecular CO2 (Exp. CO2) and microwave-excited CO2 (Exp. Diss. CO2): total CO2 pressure versus reciprocal temperature. The experimental points obtained under molecular CO2 are not shown for a better view of the results obtained under microwave-excited CO2.
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SEM micrographs (magnification×2000) of a SiC sample before treatment under CO2 plasma; R: sample under passive oxidation with a passive silica layer; M and T: samples under active oxidation with very damaged SiC surfaces or with perforated silica layers.
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Thermal recombination flux transferred to the surface (β⋅qrec) versus front-face temperature for different ceramic oxide materials at a total air pressure of 200 Pa
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Atomic oxygen recombination coefficient γ for SiO2 β-cristobalite formed on sintered SiC and for SiO2 quartz versus reciprocal temperature. The other points are data obtained on RCG (Reaction Cured Glass) coating developed by NASA 1192122.
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MEDIASE test facility: 1) hemispherical silica window, 2) water-cooled front shield, 3) water-cooled sample holder, 4) optical fiber, 5) 3-mirrors goniometer, 6) quartz crystal microbalance, 7) viewport, 8) pyrometer, 9) spectroradiometer, 10) mass spectrometer, 11) UV source, and 12) ion gun.
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Experimental average mass loss rate versus heating time at 2400°K for two different C/C materials A and B. The dotted line is the maximal value given by the JPL (Jet Propulsion Laboratory, CA).
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Experimental mass spectrum for a composite at 2100°K irradiated by protons (H+, 2 keV, 5×1016ions m−2s−1, 45° incidence).
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Total directional emissivity of a carbon/carbon material at different temperatures.
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DISCO device: A) water-cooled fiber-holder, B) reflectometer, C) pyroreflectometer, D) computer, E) concentrated solar radiation, F) specimen, G) reflectivity standard, H) control optical fiber, and J) displacement device.
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a) Evolution of the normal normal reflectivity during the oxidation of “Narloy” with T: temperature and other data: reflectivity at 1.55 and 1.30 μm. b) details of a) between 0 and 2.4 mn
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Estimated thickness of the oxide layer of “Narloy” versus time

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