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

Published online by Cambridge University Press:  23 May 2016

Atasi Dan ,
Kamanio Chattopadhyay ,
Harish C. Barshilia  and
Bikramjit Basu
Atasi Dan*
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560 012, India
Kamanio Chattopadhyay
Affiliation:
Materials Engineering, Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore-560 012, India
Harish C. Barshilia
Affiliation:
Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, HAL Airport Road, Kodihalli, Bangalore 560 017, India
Bikramjit Basu
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560 012, India Materials Engineering, Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore-560 012, India
*
# E-mail:[email protected]
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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.

Keywords

annealingcoatingsputtering
Type
Articles
Information
MRS Advances , Volume 1 , Issue 41: Energy and Environment , 2016 , pp. 2807 - 2813
Copyright
Copyright © Materials Research Society 2016 

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