Solar selective absorption coatings
AssigneeSandia Corporation
InventorsAlan R. Mahoney, Scott T. Reed, Carol S. Ashley, F. Edward Martinez
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Abstract
A new class of solar selective absorption coatings are disclosed. These coatings comprise a structured metallic overlayer such that the overlayer has a sub-micron structure designed to efficiently absorb solar radiation, while retaining low thermal emissivity for infrared thermal radiation. A sol-gel layer protects the structured metallic overlayer from mechanical, thermal, and environmental degradation. Processes for producing such solar selective absorption coatings are also disclosed.
Claims9
A solar selective absorption coating, comprising:
- a) a low emissivity surface;
- b) a nanostructured selective absorption layer atop said surface, said nanostructured selective absorption layer comprising a stratum of sub-micron pinnacles;
- and,
- c) a sol-gel protective layer deposited over said absorption layer.
A solar selective absorption coating, comprising:
- a) a low emissivity surface;
- b) a nanostructured selective absorption layer atop said surface;
- and,
- c) a sol-gel protective layer deposited over said absorption layer, wherein said sol-gel protective layer predominately consists of polymerized complexes comprising network-forming cations and bridging oxygen atoms.
A solar selective absorption coating, comprising:
- a) a low emissivity surface;
- b) a nanostructured selective absorption layer atop said surface;
- and,
- c) a sol-gel protective layer deposited over said absorption layer, wherein said sol-gel protective layer consists essentially of a polymer comprising monomers chosen from the group consisting of Al2O3, B2O3, MgO, SiO2, SiO, TiO2, and ZrO2.
Dependencies are inferred from the claim text.