12 April 1982 Fabrication Of ZrCx/Zr And Cr-CrOx Films For Practical Solar Selective Absorption Systems
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Proceedings Volume 0324, Optical Coatings for Energy Efficiency and Solar Applications; (1982); doi: 10.1117/12.933264
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States
Abstract
The developments of solar-selective absorption systems for the practical use of solar energy applications have been investigated. For the higher temperature use, 700 % 800°K, ZrCx/Zr films' with excellent heat-resistant characteristics were deposited on the stainless steel(SUS-304) pipes, 30 mm in diameter and 4500 mm in length, by reactive r-f sputtering of pure Zr cylindrical targets. The obtained collector surfaces exhibit the optical properties of a r‘, 0.93 (in visible wave length region) and E ti 0.25 (at A = 3 % 4 μm) and heat-resistant durability at ti 900°K. An absorption tube is to be settled in an evacuated glass tube-type collector, coated with ITO selective transparent film, constructed in an Al parabolic plane mirror system for the solar - thermal electric power generator in the "Sunshine project". For the lower temperature use of the solar thermal energy, below 400 ~450°K, the Cr-CrOx composite films deposited on a thin Alfoil of 40 pm thick have been developed. Cr-CrOx composite films were deposited having a graded composition by reactively evaporating Cr metals in an oxygen atmosphere of oxygen partial pressure%of 10-2 % 10-3 Pa with a roll-coating system. The obtained optical characteristics are a % 0.9 in visible wave length region and c (ε,' 0.1 at λ = 6 ~ 10 μm. The products showing stable operating characteristics are capable to apply on the heating and cooling of buildings and other general uses.
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Y. Noguchi, K. Naka, A. Isao, K. Nakamura, S. Sawada, T. Tani, S. Gonda, "Fabrication Of ZrCx/Zr And Cr-CrOx Films For Practical Solar Selective Absorption Systems", Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); doi: 10.1117/12.933264; http://dx.doi.org/10.1117/12.933264
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KEYWORDS
Chromium

Zirconium

Composites

Solar energy

Sputter deposition

Absorption

Oxygen

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