Realization And Study Of Rough, Hot Selective Surfaces By Electroless And Electrolytic Ways: Application To Some Nickel Compounds

Marie Papini; Francois Papini

doi:10.1117/12.933269

12 April 1982 Realization And Study Of Rough, Hot Selective Surfaces By Electroless And Electrolytic Ways: Application To Some Nickel Compounds

Marie Papini, Francois Papini

Author Affiliations +

Proceedings Volume 0324, Optical Coatings for Energy Efficiency and Solar Applications; (1982) https://doi.org/10.1117/12.933269
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

Abstract

Authors are relating some works carried out in the "Departement d'Heliophysique" and concerned with hot absorbing selective surfaces, rough surfaced, realized either by electrolytic way or chemical way, the common principal element of both being constituted by nickel. Then, electrochemical deposits are obtained directly by only one mode, that is the way for nickel-copper layers. Under chemical process, the operation includes two stages, deposition followed by chemical etching. Every samples are characterized by measuring optothermal properties (monochromatic absorptivity in the wavelength band 0.25 μm - 2.5 μm, total directional emissivity as a function of temperature) and using physico-chemical analysis via various methods : X-Rays,electron microscopy, Auger spectroscopy, Energy Disper-sive X-Rays analysis. The aim of such a study is double : - to make out interesting properties for some of these deposits (for example : a = 0.95, = 0.20) in the view of thermal conversion of solar energy in the mean temperature range (100°C < T < 200°C), - to study roughness influence upon the evolution of optical properties. In what concerns the first point, as foreseen application requiring sufficiently stable materials, the samples have been tested under temperature levels up to 200°C during a few thousands of hours, so that one can have some ideas upon ageing phenomena.

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Marie Papini and Francois Papini "Realization And Study Of Rough, Hot Selective Surfaces By Electroless And Electrolytic Ways: Application To Some Nickel Compounds", Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); https://doi.org/10.1117/12.933269

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