High thermal stability and resistance to oxidation at atmospheric conditions need to be critically proven to ensure a long lifetime of the receiver of concentrated solar power plants. In the present work, the titanium aluminum nitride tandem absorbers are showing one of the most promising selective coating solutions for solar receivers operating at high temperature. A series of samples were synthesized by vacuum plasma techniques in an industrial pilot-scale deposition machine. The structure consists in an Inconel 625 substrate with infrared reflective layer, followed by two TiAlN layers (tandem absorber) with refractive index gradation and covered with SiNCH, as an antireflective layer. A programmable electrical tubular furnace was used to apply cumulative aging tests on the samples under static ambient air at temperatures from 500°C to 690°C. One batch of samples was tested cumulatively in air at 500°C, for long-term representative aging, up to a total duration of 732 hours. Other samples were then submitted to cumulative accelerated aging in air at 630°C up to 264 hours, at 660°C up to 366 hours and at 690°C up to 156 hours. Spectral reflectance was systematically measured before and after aging. The results show that the optical properties did not change with aging, demonstrating long-term stability of optical properties at 500°C in air. EDS analysis revealed that the content in oxygen first increases then stabilizes over time (6 at.%), probably indicating the oxidation of the antireflective top layer SiNCH into SiO2 (as was also shown by previous XPS analysis), which then acts both as a barrier for further oxidation and as antireflective material. For higher temperatures, a maximum decrease of solar absorptance of -0.11 was observed. However, emittance also tended to decrease, limiting the decrease of the resulting heliothermal efficiency. In all cases, SEM imaging did not show any physical changes in surface morphology with aging. Overall, this type of selective coating shows both good optical performance and a very good resistance to aging at high temperature in air, rendering it very promising for CSP applications where the solar receiver is at or above 500°C, without the need to maintain it under vacuum.
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25 July 2019
SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems
2–5 October 2018
Casablanca, Morocco
Research Article|
July 25 2019
Demonstration of long term stability in air at high temperature for TiAlN solar selective absorber coatings
Alex Carling-Plaza;
Alex Carling-Plaza
b)
1PhD Candidate,
PROMES-CNRS (PROcesses, Materials, Solar Energy)
, 7 rue du Four Solaire, 66120 Font-Romeu Odeillo, France
, +34 655 536 589
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Muhammad Asaad Keilany;
Muhammad Asaad Keilany
2
PROMES-CNRS, 7 rue du Four Solaire
, 66120 Font-Romeu Odeillo, France
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Maxime Bichotte;
Maxime Bichotte
3
HEF-IREIS (Research Institute on Surface Engineering)
, 7 rue Salvador Dali, 42000 Saint-Etienne, France
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Audrey Soum-Glaude;
Audrey Soum-Glaude
a)
2
PROMES-CNRS, 7 rue du Four Solaire
, 66120 Font-Romeu Odeillo, France
a)Corresponding author: [email protected]
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Laurent Thomas;
Laurent Thomas
4
PROMES-CNRS, Tecnosud, Rambla de la Thermodynamique
, 66100 Perpignan, France
5
Université de Perpignan Via Domitia (UPVD)
, 52 avenue Paul Alduy, 66860 Perpignan Cedex 9, France
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Laurent Dubost
Laurent Dubost
3
HEF-IREIS (Research Institute on Surface Engineering)
, 7 rue Salvador Dali, 42000 Saint-Etienne, France
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a)Corresponding author: [email protected]
AIP Conf. Proc. 2126, 020001 (2019)
Citation
Alex Carling-Plaza, Muhammad Asaad Keilany, Maxime Bichotte, Audrey Soum-Glaude, Laurent Thomas, Laurent Dubost; Demonstration of long term stability in air at high temperature for TiAlN solar selective absorber coatings. AIP Conf. Proc. 25 July 2019; 2126 (1): 020001. https://doi.org/10.1063/1.5117509
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