Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating

Dan, A and Chattopadhyay, K and Barshilia, Harish C and Basu, B (2016) Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating. MRS Advances, 1 (41). pp. 2807-2813.

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Abstract

The solar absorptance property of W/WAlN/WAlON/Al2O3-based coatings, deposited by DC/RF magnetron sputtering on stainless steel substrate was studied by measuring the reflectance spectra in the wavelength range of 250 - 2500 nm. The effect of thermal annealing on the optical properties of the solar selective absorber coatings was investigated. Annealing the coatings at 450°C for 150 hrs in air did not show any significant change in the spectral properties of the absorber coating indicating the excellent thermal stability of the coating. The W layer acts as infrared reflective layer and diffusion barrier on stainless steel substrate. The top Al2O3 layer serves as dense shield to protect the under layers from oxidation in air. In summary, the present study indicates the potential application of W/WAlN/WAlON/Al2O3-based selective coatings in high temperature photo thermal conversion systems.

Item Type: Article
Subjects: RENEWABLE ENERGY > Solar Energy
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Mrs SK Pratibha
Date Deposited: 26 Jun 2018 10:20
Last Modified: 26 Jun 2018 10:20
URI: http://nal-ir.nal.res.in/id/eprint/12865

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