Scientific Results

Effect of surface texturing by femtosecond laser on tantalum carbide ceramics for solar receiver applications

Year: 2017

Authors: Sciti D., Trucchi D.M., Bellucci A., Orlando S., Zoli L., Sani E.

Autors Affiliation: CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy; CNR-ISM, Institute of Structure of Matter – Montelibretti Section, Via Salaria km29.300, I-00015 Monterotondo Scalo, Italy;
CNR-INO, National Institute of Optics, Largo E. Fermi, 6, I-50125 Firenze, Italy

Abstract: Tantalum carbide, as a Ultra-High Temperature Ceramic, is known to be characterized by intrinsic spectral selectivity, which makes it attractive for novel high-temperature thermal solar absorbers. However, a weakness point of TaC is the solar absorbance, which, in absence of any treatment, is usually lower than that of other materials currently under development for solar absorber applications. In the present work we have investigated the effect of surface texturing by femtosecond laser machining on this superhard material. Laser-induced microstructural and optical property changes have been characterized in two samples with different starting roughness and for four ‘laser treatments each, as a function of the accumulated laser fluence. As the interaction with the laser beam takes place and gets stronger, both surface and chemical composition changes appear. Optical properties are heavily affected: solar absorbance considerably increases, at a slight expense of spectral selectivity.

Journal/Review: SOLAR ENERGY MATERIALS AND SOLAR CELLS

Volume: 161 (1)      Pages from: 1  to: 6

More Information: Part of this activity has been carried out in the framework of the STAGE-STE European project and \”SOLE-2\” project funded by the Italian bank foundation \”Fondazione Ente Cassa di Risparmio di Firenze\” (Pratica n. 2014.0711). Thanks are due to C. Melandri and D. Dalle Fabbriche (CNR-ISTEC) and M. D
KeyWords: Carbides; Ceramic materials; Laser beams; Optical properties; Tantalum; Tantalum carbide; Ultrashort pulses, Ceramic; Chemical compositions; Femtosecond laser machining; Spectral selectivity; Superhard material; Surface patterning; Thermal solar absorbers; Ultra-high-temperature ceramics, Solar absorbers
DOI: 10.1016/j.solmat.2016.10.054

Citations: 11
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