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US 4,153,753 AGranted
Spectrally selective surfaces and method of fabricating the same
AssigneesTrevor P. Woodman, Albert Fischer
InventorsTrevor P. Woodman, Albert Fischer
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AssigneesTrevor P. Woodman, Albert Fischer
InventorsTrevor P. Woodman, Albert Fischer
Estimating the term…
The invention comprises spectrally selective surfaces having a good performance at relatively low cost, and designed to be used mainly, but not exclusively, in solar thermal energy collectors. Suitable substances in powder form are attached by simple and effective means to a suitable surface. This is accomplished by the use of new classes of binders, or alternatively, by novel, purely mechanical means, without the use of a binder. The binders described herein feature a high transparency for the infrared radiation emitted by the hot underlying surface, coupled with good adhesive properties towards both the powder and the surface to be coated. The method of effecting the adhesion of a powder layer to the underlying surface without the use of a binder consists of bringing the powder layer into intimate contact with the surface, for example by pressing or rolling the powder layer onto or into the surface, especially with simultaneous mechanical deformation of the object whose surface is being coated.
A body with spectrally selective surface possessing the absorptivity for solar radiation of a correspondingly colored non-selective surface but having a significantly lower emissivity for heat radiation than said non-selective surface, comprising an outer layer comprising at least one metal oxide pigment in powder form selected from the group consisting essentially of oxides of copper, cobalt, iron or mixtures thereof, a supporting substrate having a poorly emitting metal surface selected from the group consisting essentially of copper or aluminum, said outer metal oxide powder layer being mechanically attached to the poorly emitting metal surface of the supporting substrate directly or by means of a binder which is largely transparent to heat radiation emitted from the underlying metal surface, said outer layer possessing a high absorptivity for solar radiation, while being largely transparent to the heat radiation emitted by the surface of the substrate.
A process for the fabrication of a body with a spectrally selective surface, comprising the steps of:
Dependencies are inferred from the claim text.