Emissivity of Elgiloy and pure niobium at high temperature for the Solar Orbiter mission. (August 2017)

• Record Type: Journal Article
• Authors: Balat-Pichelin, M.; Sans, J.L.; Escape, C.; Combes, H.
• Is Part Of: Vacuum. Volume 142(2017)
• Page Start: 87
• Page End: 95
• Publication Date: 2017-08
• Subjects: Emissivity -- High temperature materials -- Co-Cr-Ni alloy -- Niobium -- Surface roughness -- Solar Orbiter mission; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2017.05.012
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The science payload of the Solar Orbiter mission that will be launched in 2018 comprises the RPW (Radio and Plasma Waves) experiment that will perform in situ and remote-sensing measurements (magnetic and electric fields). Some parts of this instrument will be made of Elgiloy for the antennas and must be protected from the intense solar radiation by a heat shield made in niobium. Emissivity of both materials is important to know in order to correctly model before launch the heat transfer in the instrumentation. Hemispherical emissivity results in the two following wavelength ranges 0.6–2.8 and 0.6–40 μm are presented at temperatures up to 1500 K for these two materials according to their surface roughness particularly for the niobium samples and at room temperature in the wavelength range 0.25–25 μm. New original data are obtained for both the materials at high temperature. Highlights: New thermo-optical properties of Elgiloy and niobium were measured at room temperature. Original emissivity data were obtained on Elgiloy up to 1380 K. New emissivity data on niobium surfaces were obtained up to 1360 K. Detailed surface characterization in relation to emissivity data are highlighted.