Optical Properties and Durability of Al2O3-NiP/Al Solar Absorbers Prepared by Electroless Nickel Composite Plating
| Autor: | J. H. Lee, S. J. Hsueh, T.K. Tsai, J.S. Fang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Composite number Metallurgy engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Electroless nickel Coating Plating Absorptance Materials Chemistry engineering Thermal stability Thermal emittance Electrical and Electronic Engineering Composite material Layer (electronics) |
| Zdroj: | Journal of Electronic Materials. 41:53-59 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-011-1746-2 |
| Popis: | 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 (e) 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/e = 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink