Schott Solar Ag

Schott Ag

Kamel Silmy

Thomas Kuckelkorn

Sebastian Dreyer

Wolfgang Graf

Andreas Georg

Christina Hildebrandt

Jan Schulte-Fischedick

The radiation-selective absorber coating, in particular for an absorber tube of a parabolic trough collector, includes a reflective layer which is reflective in the infrared range, at least one barrier layer arranged below the reflective layer, at least one absorption layer arranged above the reflective layer, an antireflection layer arranged above the absorption layer and at least one adhesion-enhancing layer arranged between the barrier layer and the reflective layer. The adhesion-enhancing layer preferably is a molybdenum layer, but can also be provided by a copper, titanium, titanium oxide, or silicon layer. The adhesion-enhancing layer preferably has a thickness of 5 to 50 nm.

Radiation-selective absorber coating and absorber tube with radiation-selective absorber coating

The radiation-selective absorber coating for absorber tubes of parabolic trough collectors includes two or more barrier layers (); an infrared reflective layer () on the barrier layers (); at least one cermet absorption layer () above the infrared reflective layer () and an antireflection layer () above the at least one cermet absorption layer (). The two or more barrier layers () include a first barrier layer () of thermally produced oxide and a second barrier layer () arranged above it. The second barrier layer () is a cermet material including at least one oxide compound and at least one metal. The oxide compound is aluminium oxide, silicon oxide, nickel oxide and/or chromium oxide. The metal is molybdenum, nickel, tungsten and/or vanadium. The invention also includes an absorber tube with the absorber coating on it.

Radiation-selective absorber coating and absorber tube with said radiation-selective absorber coating

The radiation-selective absorber coating () has two barrier layers (), an IR-reflecting layer () arranged thereon, an absorption layer () arranged above the IR-reflecting () and an antireflection layer () over the absorption layer (). The absorber tube () is a steel tube () with the radiation-selective absorber coating () applied to the outside thereof. In the process of coating the absorber tube () a first oxide barrier layer () is applied to a steel tube by thermal oxidation; a second barrier layer () is then applied by physical gas phase deposition of silicon with supply of oxygen; the IR-reflecting layer () is then applied by gas phase deposition of gold, silver, platinum or copper; the absorption layer () is then applied by deposition of aluminum and molybdenum; and a final antireflection layer () is applied by deposition of silicon with supply of oxygen.

Radiation-selective absorber coating, absorber tube and process for production thereof

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Mitterteich, Germany

Kamel Silmy