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Abstract

This work continues the study of cobalt oxide spectral selective coatings performed at Delft University of Technology: To develop a highly spectral selective absorber surface based on cobalt oxide, which is thermally stable to 500**oC (air and vacuum), with high corrosion resistance and attractive for economic application. This aim has partly been achieved due to the recrystallization and diffusion of the coatings. Two types of cobalt oxide coatings have been developed with different properties as to spectral selectivity, thermal stability, and corrosion resistance: Co/Fe(III) oxide on Ni, produced by flame or furnace, oxidation of electroplated Co/Fe(III) on bright plated Ni, and: Co/Mo oxide on Ni, produced by electrochemical oxidation of electroplated Co/Mo on bright plated Ni. Other alloying elements, e.g. W and Cr, were investigated to improve the durability. A diffusion barrier layer with Pd and Cr between the substrate and the cobalt coating did not significantly improve the stability. Some outdoor testing of the above mentioned surfaces on different collector types has given results on stagnation temperatures.

Additional information

Authors: BOOSE C A, CENTRAL ORGANIZATION FOR APPLIED RESEARCH TNO, THE HAGUE (THE NETHERLANDS);VAN DER LEIJ M CENTRAL ORGANIZATION FOR APPLIED RESEARCH TNO, THE HAGUE (THE NETHERLANDS), CENTRAL ORGANIZATION FOR APPLIED RESEARCH TNO, THE HAGUE (THE NETHERLANDS)
Bibliographic Reference: EUR 9156 EN (1985) MF, 176 P., BFR 300, BLOW-UP COPY BFR 880, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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