Activation Energy Measurement of Cu/SS-AlN/SiAlO_x Solar Selective Absorbing Coating

Abstract:

Activation energy is an important parameter which determines thermal stability of solar selective absorbing coating. In this investigation, a new performance criterion (PC) was defined for solar selective coating according to our modified equation of photo-thermal conversion. Then the activation energy of Cu/stainless steel (SS)-AlN/SiAlO_x solar selective absorbing coating was measured. Cu/SS-AlN/SiAlO_x tandem films were deposited by magnetron sputtering. Accelerated ageing tests were performed on the coating at 500°C and 550°C, under the atmosphere, calculating PC from the reflectance spectrum and measuring the failure time. According to Arrhenius equation, the activation energy and the equivalent life span of Cu/SS-AlN/SiAlO_x tandem film at 400°C were determined to be about 187.4kJ/mol and more than 16260 hours, respectively.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 870-877
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.870
• Online since: January 2013
• Authors: Jin Ping Wang, Bo Yuan, Jian Wang, Yi Luo
• Keywords: Activation Energy, Cu/SS-AlN/SiAlO_x, Equivalent Life Span, Solar Selective Coating

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