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Development of W–SiO2 and Nb–TiO2 solar absorber coatings for combined heat and power systems at intermediate operation temperatures
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Materialoptik)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Materialoptik)
Center for Materials and Microsystems, Fondazione Bruno Kessler, Trento, Italy.
Dipartimento di Meccanica, Politecnico di Milano, Milan, Italy.
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2015 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 133, 180-193 p.Article in journal (Refereed) Published
Abstract [en]

Two new absorber coatings for mid-temperature operation (300–350 1C) in collectors for solar thermal electricity plants are presented in this study. The absorbers consist of two cermet layers of either W–SiO2 or Nb–TiO2, deposited on a molybdenum infrared reflector and coated with an antireflection layer of silicon oxide. The optimization of the optical performance was made in two steps. First, the layer structure was optimized in model calculations. The optical constants used in this modelling were derived directly from sputtered films of the cermet constituents using reflectance and transmittance measure- ments. The absorber coatings were then sputter-deposited using parameters from the modelling. The results show good agreement between modelled and sputtered optical performance evaluated as solar absorptance and thermal emittance at 350 1C. The optimal values reached for W–SiO2 was 0.91 in combination with 0.08 and 0.93 in combination with 0.09 for Nb–TiO2. The materials characterization from XRD, AES and TEM shows that the composite coatings contain nano-metal inclusions, meaning that they are cermet coatings. Scratch tests show that the coatings adhere well to the substrate of stainless steel. Temperature testing at 350 1C in vacuum for up to 1500 h shows that both coatings are stable under such conditions. Only a slight change occurs during the first 72 h that decreases the emittance but does not change the solar absorptance. ERDA confirms that there is no detectable level of ion migration between layers, only a small decrease in hydrogen content was observed, which indicates outgassing.

Place, publisher, year, edition, pages
2015. Vol. 133, 180-193 p.
National Category
Other Engineering and Technologies
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-239313DOI: 10.1016/j.solmat.2014.10.022ISI: 000348015100027OAI: oai:DiVA.org:uu-239313DiVA: diva2:774172
Projects
Digespo project
Funder
EU, FP7, Seventh Framework Programme
Available from: 2014-12-22 Created: 2014-12-22 Last updated: 2017-12-05Bibliographically approved

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Wäckelgård, EwaMattsson, AndreasGustavsson, FredrikPrimetzhofer, Daniel

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