Abstract
A simple and low-cost method, electroless nickel composite plating, was used to deposit an Al2O3-NiP composite coating on an Al substrate to form an Al2O3-NiP/Al solar absorber. The effects of the Al2O3 content in the Al2O3-NiP composite coating, the thickness of the coating, and the use of a double-layer Al2O3-NiP composite coating and a TiO2 antireflection (AR) layer on the optical characteristics of the Al2O3-NiP/Al absorbers were studied. The absorptance (α) and thermal emittance (ε) of the Al2O3-NiP/Al absorbers increased with the Al2O3 content in the Al2O3-NiP composite coating and decreased as the thickness of the coating increased. A double-layer Al2O3-NiP/Al absorber with 2:1 thickness ratio of the top layer (Al2O3-NiP with 25 vol.% Al2O3) to the inner layer (Al2O3-NiP with 7 vol.% Al2O3) had the best optical properties (α/ε = 0.746/0.103). The optimal double-layer Al2O3-NiP/Al absorber with a 106-nm-thick TiO2 AR layer achieved absorptance of 0.893 and thermal emittance of 0.111. The results of a thermal stability test and a condensation test revealed that the TiO2-coated double-layer Al2O3-NiP/Al absorbers had excellent thermal stability, and their failure time in the condensation test exceeded 100 h.
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Tsai, T.K., Hsueh, S.J., Lee, J.H. et al. Optical Properties and Durability of Al2O3-NiP/Al Solar Absorbers Prepared by Electroless Nickel Composite Plating. J. Electron. Mater. 41, 53–59 (2012). https://doi.org/10.1007/s11664-011-1746-2
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DOI: https://doi.org/10.1007/s11664-011-1746-2