Optical properties of boride ultrahigh-temperature ceramics for solar thermal absorbers

Year: 2014

Authors: Sani E., Meucci M., Mercatelli L., Jafrancesco D., Sans J-L., Silvestroni L., Sciti D.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Firenze 50125, Italy;
PROMES-CNRS Processes, Materials and Solar Energy Laboratory,Font Romeu 66120, France;
CNR-ISTEC, Istituto di Scienza e Tecnologia dei Materiali Ceramici, 48018 Faenza, Italy

Abstract: It is a known rule that the efficiency of thermodynamic solar plants increases with the working temperature. At present, the main limit in temperature upscaling is the absorber capability to withstand high temperatures. The ideal solar absorber works at high temperatures and has both a low thermal emissivity and a high absorptivity in the solar spectral range. The present work reports on the preparation and optical characterization of hafnium and zirconium diboride ultrahigh-temperature ceramics for innovative solar absorbers operating at high temperature. Spectral hemispherical reflectance from the ultraviolet to the mid-infrared wavelength region and high-temperature hemispherical emittance reveal their potential for high-temperature solar applications. Boride samples are compared with silicon carbide (SiC), a material already used in solar furnaces. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)


Volume: 4      Pages from: 045599  to: 045599

More Information: High-temperature measurements were possible with financial support by the Access to Research Infrastructures activity in the 7th Framework Programme of the EU (SFERA Grant Agreement n. 228296). Authors thank the PROMES Director and PROMES Researchers for the use of facilities. Thanks are due to Mauro Pucci, Massimo D\’Uva, Roberto Rossi, and Leonardo Cirri for technical assistance.
KeyWords: Concentrating solar power; Emittances; Hemispherical reflectance; Mid-infrared wavelengths; Optical characterization; Silicon carbides (SiC); Solar thermal absorbers; Ultra-high-temperature ceramics, Borides; Ceramic materials; Optical properties; Reflection; Silicon carbide; Solar absorbers; Solar energy; Solar furnaces, Temperature
DOI: 10.1117/1.JPE.4.045599

Citations: 19
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