Thermal stability of WAlN/WAlON/Al 2 O 3 -based solar selective absorber coating
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Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating Atasi Dan, Kamanio Chattopadhyay, Harish C. Barshilia and Bikramjit Basu MRS Advances / FirstView Article / May 2016, pp 1 - 7 DOI: 10.1557/adv.2016.388, Published online: 23 May 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116003881 How to cite this article: Atasi Dan, Kamanio Chattopadhyay, Harish C. Barshilia and Bikramjit Basu Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.388 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.388
Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating Atasi Dan,a, # Kamanio Chattopadhyay,b Harish C. Barshilia,c Bikramjit Basu a,b a
Materials Research Centre, Indian Institute of Science, Bangalore-560 012, India
b
Materials Engineering, Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore-560 012, India
c
Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, HAL Airport Road, Kodihalli, Bangalore 560 017, India
#
E-mail: [email protected]
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. Introduction Solar energy is one of the reliable sources of energy to meet the ever-increasing demand of renewable energy. In this regard, concentrating solar power (CSP) is the emerging system for photo-thermal conversion of solar energy. Solar energy can be converted to thermal energy and subsequently the thermal energy can be used to generate electricity in CSP systems 1. There are numerous components of the CSP systems like, several mirror configurations, receiver tube, heat transfer fluid, thermal energy storage etc 2. Among all the components, the performance of the CSP systems depends on the receiver tube. The efficiency of a CSP system can be increased if the solar energy absor
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