Solar absorbers with layers of nickel/chromium alloy and dielectric material
First Claim
1. A solar absorber for collecting solar energy comprising, a metallic or metallized substrate having a weak hemispherical emission factor in the infra-red range, a semi-transparent metallic layer adhering to the substrate, and an outer dielectric interference layer adhering to said semi-transparent layer to form a composite structure, the metallic layer being a layer of nickel/chromium alloy consisting of 60 to 85% by weight of nickel and of 40 to 15% by weight of chromium, and the dielectric layer being a layer of a material selected from the group comprising silicon monoxide, zinc sulphide and silicon dioxide, said solar absorber composite structure having a solar absorption factor/hemispherical emission ratio greater than 10.
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Abstract
This invention relates to space vehicles. It is concerned with solar absorbers consisting of a metallic or metallized substrate with a weak hemispherical emission factor coated with two layers consisting of a semi-transparent metallic layer adhering to the substrate and of an outer interference dielectric layer. The metallic layer is a layer of nickel/chromium alloy consisting of 60 to 83% by weight of nickel and of 40 to 15% by weight of chromium, and the dielectric layer is a layer of silicon monoxide, of zinc sulphide or silicon dioxide.
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6 Claims
- 1. A solar absorber for collecting solar energy comprising, a metallic or metallized substrate having a weak hemispherical emission factor in the infra-red range, a semi-transparent metallic layer adhering to the substrate, and an outer dielectric interference layer adhering to said semi-transparent layer to form a composite structure, the metallic layer being a layer of nickel/chromium alloy consisting of 60 to 85% by weight of nickel and of 40 to 15% by weight of chromium, and the dielectric layer being a layer of a material selected from the group comprising silicon monoxide, zinc sulphide and silicon dioxide, said solar absorber composite structure having a solar absorption factor/hemispherical emission ratio greater than 10.
Specification