Chidambaram, K. ; Malhotra, L. K. ; Chopra, K. L. (1982) Spray-pyrolysed cobalt black as a high temperature selective absorber Thin Solid Films, 87 (4). pp. 365-371. ISSN 0040-6090
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/004060...
Related URL: http://dx.doi.org/10.1016/0040-6090(82)90289-9
Abstract
Cobalt oxide coatings with an integrated solar absorptance of 0.93 and a hemispherical emittance at 100°C of 0.14 were prepared by spray pyrolysis on stainless steel substrates kept at 300°C. The coatings are strongly adherent and stable up to temperatures of about 600°C. Auger electron spectroscopy, X-ray photoelectron spectroscopy and X-ray and electron diffraction investigations revealed the coatings to be composed of an upper layer of Co3O4 and subsequent layers of CoO down to the substrate. The absorption mechanism is primarily intrinsic. Lower substrate temperatures (about 150°C) can be used for preparing coatings from equimolar aqueous solutions of cobaltous acetate and thiourea. Such coatings, containing both cobalt oxide and cobalt sulphide, have a comparable absorptance but a higher emittance and are stable only up to about 300°C.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
ID Code: | 22996 |
Deposited On: | 25 Nov 2010 13:43 |
Last Modified: | 28 May 2011 05:26 |
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