Summarize what you understand from this article. ARTICLE INFO ABSTRACT Article h

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Summarize what you understand from this article.

ARTICLE INFO ABSTRACT Article history Solar selective coatings based on double Al203 W cermet layer rs and AISINIAISiON bilayer structures 13 March 2014 were prepared by magnetron sputtering. Both were deposited on stainless steel substrates using a in revised fom metallic tungsten (W) layer as back reflector. The coating stacks were completed by antireflection 8 January 2015 (AR) layer posed of Aleos. SiO2, or Alsio Spectrophotometer r measurements, X-Ray diffraction. Accepted 20 January 2015 Scanning electron microscopy, Energy Dispersive X-Ray Spectroscopy and Rutherford Backscattering Available online 16 Februa 2015 Spectrometry were used to characterize the optical properties, crystalline structure, morphology and sition of these coatings. The spectral optical constants of the single layers were calculated from AlSiNIAISiON the reflectance and transmittance measurements and used to design the optical stack. The coatings Al20s W cermet exhibit a solar of 93-95% and an emissivity of 7-10 (at 400 C) The coatings also exhibit Solar selective absorber excellent thermal stability, with small changes in the optical properties of the coating during heat Dielectric function modelling treatments at 400 c in air for 2500 h and at 580 Cin vacuum for850 h.The coating based on the AISIN/ optical constant AlSiON bilayer structure was obtained with an Al:Si ratio of 2.5:1. These coatings revealed similar Thermal emittance performance as the one obtained with coatings based on Alzos:W cermet layers. 2015 Elsevier BV. All rights reserved. 1. Introduction Several materials have the appropriate optical properties and can have the necessary durability at operating temperatures at for p al conversion have already been devel- 400 °C and above, and potential materials have been identified in oped for decades [1-4l. They are commonly used for water heating systems (T20 y) durability and oxidation resistance of the solar selective coating. coating (cermet) 18.91 by decreasing continuously the metal volume fraction from the interface metal/substrate to the surface The cermet t consists of small metal particles embedded in a ceramic matrix, where the role of the metallic particles is to increase the solar absorption, due to the interband transitions in the metal and to reduce the absorption in the thermal IR region. due to the small particle size. The concept offers a broad range of Corresponding au thor: Tel.: +351 253510472; fax: +351 253510461 options for solar selectivity optimization and it depends on the E-mail address: rebouta fisica.umi inho.pt (L. Rebouta)

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This article tells about the solar selective coating techiniques and how to increase the thermal stability of the coating at higher temperatures. we will increase the thermal stability with small changes in optical propeties of coating materials.

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