Cr-(CrN/TiAlN)m-AlSiN-AlSiO open-air stable solar selective coating for concentrated solar thermal power applications
| Autor: | Smita G. Rao, Krishna Valleti, Pooja Miryalkar, A. Sandeep, D. Srinivasa Rao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 02 engineering and technology Temperature cycling engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Corrosion Contact angle Coating Physical vapor deposition Thermal Concentrated solar power Emissivity engineering Composite material 0210 nano-technology |
| Zdroj: | Solar Energy Materials and Solar Cells. 215:110634 |
| ISSN: | 0927-0248 |
| Popis: | A novel spectrally selective multilayer coating: Cr-(CrN/TiAlN)m-AlSiN-AlSiO on SS316 substrate/tube was deposited via Cathodic Arc Physical Vapor Deposition (CAPVD) technique. The coating exhibited state-of-the-art absorptivity (α = 0.95–0.96) and emissivity (e = 0.09–0.11). In view of open-air solar thermal application requirements, the coating has been systematically analysed for its thermal, environmental (corrosion) and mechanical stability. The thermal cycling studies carried out at 500 °C in open-air conditions have shown no change in optical properties for about 150 cycles. Further, accelerated thermal aging tests have shown an extrapolated service life of 25 years at 411 °C. In the case of corrosion studies, up to 520 h of exposure to 5% NaCl medium, no considerable change in optical properties was observed. Further, the coatings were well adherent to the substrates/tubes (6 N of critical load) with a considerable hydrophobicity (104° contact angle). The observed results indicate that, Cr-(CrN/TiAlN)2–AlSiN–AlSiO coating may be a good choice for developing receiver tubes used in Concentrated Solar Power (CSP) systems with best solar selective properties and the capability to withstand harsh environments like solar flux variations, thermal shocks in the presence of open-air pollutants, dust and humidity. |
| Databáze: | OpenAIRE |
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