Global to push GA events into
skip to main content

Title: High temperature solar selective coatings

Improved solar collectors (40) comprising glass tubing (42) attached to bellows (44) by airtight seals (56) enclose solar absorber tubes (50) inside an annular evacuated space (54. The exterior surfaces of the solar absorber tubes (50) are coated with improved solar selective coatings {48} which provide higher absorbance, lower emittance and resistance to atmospheric oxidation at elevated temperatures. The coatings are multilayered structures comprising solar absorbent layers (26) applied to the meta surface of the absorber tubes (50), typically stainless steel, topped with antireflective Savers (28) comprising at least two layers 30, 32) of refractory metal or metalloid oxides (such as titania and silica) with substantially differing indices of refraction in adjacent layers. Optionally, at least one layer of a noble metal such as platinum can be included between some of the layers. The absorbent layers cars include cermet materials comprising particles of metal compounds is a matrix, which can contain oxides of refractory metals or metalloids such as silicon. Reflective layers within the coating layers can comprise refractory metal silicides and related compounds characterized by the formulas TiSi. Ti.sub.3SiC.sub.2, TiAlSi, TiAN and similar compounds for Zr and Hf. The titania can be characterized by the formulas TiO.sub.2, Ti.sub.3O.sub.5. TiOxmore » or TiO.sub.xN.sub.1-x with x 0 to 1. The silica can be at least one of SiO.sub.2, SiO.sub.2x or SiO.sub.2xN.sub.1-x with x=0 to 1.« less
Issue Date:
OSTI Identifier:
Alliance for Sustainable Energy, LLC (Golden, CO) GFO
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2007 Oct 18
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
Country of Publication:
United States

Works referenced in this record:

Plastic deformation of single crystals of transition metal disilicides
journal, August 1997
  • Ito, Kazuhiro; Moriwaki, Masaya; Nakamoto, Takayuki
  • Materials Science and Engineering: A, Vol. 233, Issue 1-2, p. 33-43
  • DOI: 10.1016/S0921-5093(97)00046-4

Hillock formation by surface diffusion on thin silver films
journal, February 1972

The role of microstructure and surface energy in hole growth and island formation in thin silver films
journal, February 1972

Quasicrystal films: numerical optimization as a solar selective absorber
journal, December 1995

Oxidation of quasicrystalline and crystalline AlCuFe thin films in air
journal, October 1997

Spectral reflectance of TiNx and ZrNx films as selective solar absorbers
journal, January 1977

Study on d.c. magnetron sputter deposition of titanium aluminium nitride thin films: effect of aluminium content on coating
journal, December 1996

Prediction of silicide formation and stability using heats of formation
journal, December 1996