Development of ZrB2-based single layer absorber coating and molten salt corrosion of bulk ZrB2-SiC ceramic for concentrated solar power application

Ranjith, KP and Hasan, MA and Dey, A and Basu, B (2021) Development of ZrB2-based single layer absorber coating and molten salt corrosion of bulk ZrB2-SiC ceramic for concentrated solar power application. In: Journal of Physical Chemistry C .

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Abstract

This study has dual objectives, one to develop single layer ZrB2-SiC-based ceramic absorber coating on stainless substrate, and another aim is to explore the degradation of ZrB2- SiC bulk ceramic in molten solar salt. In particular, we report the molten salt corrosion behavior of earlier developed ZrB2-SiC ceramic composite at 400 °C for 100 h. The corrosion rate in solar salt was determined to be 0.73 ± 0.09 mg h-1/cm2by gravimetric analysis. Binary and ternary oxide phases were formed due to electrochemical corrosion. The hot-pressed bulk ZrB2-SiC ceramic exhibits a high solar absorptance of 0.848 and also a high thermal emissivity of 0.66. A one-layer solar selective absorber coating without antireflection layer was developed using the ceramic disk as a sputtering target. When deposited using radio frequency (RF) magnetron sputtering technique on stainless steel substrate, a solar absorptance of 0.769 and thermal emissivity of 0.15 was obtained for an amorphous coating of thickness ~90 nm, without antireflection coating. The composition, determined by electron probe microanalyzer and X-ray photoelectron spectroscopy techniques, revealed nonstoichiometric phases in the layer with a relatively higher concentration of the lighter elements. The implication of the present work for concentrated solar power application is discussed. © 2021 American Chemical Society. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Antireflection coatings; Corrosion rate; Corrosive effects; Electrochemical corrosion; Electromagnetic wave emission; Fused salts; Gravimetric analysis; Magnetron sputtering; Silicon; Silicon carbide; Silicon compounds; Solar absorbers; X ray photoelectron spectroscopy, Anti-reflection layers; Concentrated solar power; Electron probe micro analyzer; Molten salt corrosion; Non-stoichiometric phasis; Radio frequency magnetron sputtering; Selective absorber coatings; Stainless steel substrates, Zirconium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	07 Oct 2021 15:57
Last Modified:	07 Oct 2021 15:57
URI:	http://eprints.iisc.ac.in/id/eprint/69677

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