CSIR Central

Extremely high temperature stable nanometric scale multilayer spectrally selective absorber coating: Emissivity measurements at elevated temperatures and a comprehensive study on ageing mechanism

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

View Archive Info
 
 
Field Value
 
Title Extremely high temperature stable nanometric scale multilayer spectrally selective absorber coating: Emissivity measurements at elevated temperatures and a comprehensive study on ageing mechanism
 
Creator Niranjan, K
Soum-Glaude, Audrey
Carling-Plaza, Alex
Bysakh, Sandip
John, Siju
Barshilia, Harish C
 
Subject Engineering Materials
 
Description Spectrally selective W/WAlSiN/SiON/SiO2 solar absorber coatings were sputter-deposited on stainless steel and silicon substrates. The optimized as-deposited sample exhibits a high solar absorptance of 0.955 and a low thermal emissivity of 0.10 at 82 degrees C. The coating exhibits a very low reflectance of 1.2% in the wavelength range of 0.5-1.5 mu m in the solar spectrum. The spectral emissivity measurements at various operating temperatures and with varying emergence angles were investigated. Also, the impact of emissivity on the photothermal efficiency at different temperatures of the developed solar absorber coating was calculated. The calculated optical properties of the as-deposited sample exhibited low thermal emissivity of 0.157 (at 500 degrees C) and a high heliothermal efficiency of 89.5%. Angular reflectance measured at room temperature illustrates an insignificant change in the hemispherical and near normal emissivities of the samples. In addition to these studies, the ageing tests of the as-deposited samples at various operating temperatures were studied in detail. The thermal ageing tests of the samples in air and vacuum environments indicated excellent thermal stability at elevated temperatures, i.e., in air at 400 degrees C for 500 h, at 450 degrees C for 175 h and at 500 degrees C for 100 h, whereas, in a vacuum it was stable at 700 degrees C for 200 h. The top anti-reflection layers and the fine nano-multilayers of WAlSiN (W2N and AlSiN) prevent the inward diffusion of oxygen and thereby improve the overall thermal stability of the tandem absorber.
 
Publisher Elsevier
 
Date 2021-03
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://cgcri.csircentral.net/5246/1/bysakh.pdf
Niranjan, K and Soum-Glaude, Audrey and Carling-Plaza, Alex and Bysakh, Sandip and John, Siju and Barshilia, Harish C (2021) Extremely high temperature stable nanometric scale multilayer spectrally selective absorber coating: Emissivity measurements at elevated temperatures and a comprehensive study on ageing mechanism. Solar Energy Materials and Solar Cells, 221. Art No-110905. ISSN 0927-0248
 
Relation http://cgcri.csircentral.net/5246/