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

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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.

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Authors and Affiliations

  1. Materials Research Centre, Indian Institute of Science, 560 012, Bangalore, India

    Atasi Dan & Bikramjit Basu

  2. Materials Engineering, Interdisciplinary Centre for Energy Research, Indian Institute of Science, 560 012, Bangalore, India

    Kamanio Chattopadhyay & Bikramjit Basu

  3. Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, HAL Airport Road, 560 017, Kodihalli, Bangalore, India

    Harish C. Barshilia

Authors
  1. Atasi Dan
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  2. Kamanio Chattopadhyay
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  3. Harish C. Barshilia
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  4. Bikramjit Basu
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Correspondence to Atasi Dan.

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Dan, A., Chattopadhyay, K., Barshilia, H.C. et al. Thermal stability of WAlN/WAlON/Al2O3-based solar selective absorber coating. MRS Advances 1, 2807–2813 (2016). https://doi.org/10.1557/adv.2016.388

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  • DOI: https://doi.org/10.1557/adv.2016.388

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