Solar energy absorber comprising nickel support with coating - of nickel oxide and chromium oxide giving 85 per cent min. absorption coefft

A solar energy absorber consists of a nickel support with a uniform coloured coating comprising >=90% nickel oxide and 1-10% chromium oxide with an absorption coefficient of >=0.85 at =25 degrees C in the wavelength range 0.2-20 mu. Pref., apat from the usual impurities, the nickel support has...

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Bibliographische Detailangaben
Hauptverfasser:	ALBERT SMITH,VICTOR, ERNEST EVANS,THOMAS
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY RANGES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	A solar energy absorber consists of a nickel support with a uniform coloured coating comprising >=90% nickel oxide and 1-10% chromium oxide with an absorption coefficient of >=0.85 at =25 degrees C in the wavelength range 0.2-20 mu. Pref., apat from the usual impurities, the nickel support has a max. sulphur content of 0.005% and carbon content of 0.08%. The surface of the nickel support is pref. treated with a soln. contg. an acid oxidising 1-4.2 mol/1 hexavalent-chromium from chromium trioxide and/or >=1 soluble chromate or bichromate, other than manganese salts, 2-4 mol/l. free bisulphate ions from sulphuric acid and/or >=1 sulphate or bisulphate, other than manganese sulphate or bisulphate, for a sufficient period to produce an oxidic nickel from the support and >=1 metal from the soln. The prefd. treatment temp. is 50-75 degrees C.