Radiation selective absorber coating for an absorber pipe, absorber pipe with said coating, and method of making same

US7909029B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Thomas Kuckelkorn · Idar-Oberstein, DE
• Wolfgang Graf · Sankt Goarshausen, DE
• Christina Hildebrandt · Glückstadt, DE
• Andreas Georg · Glückstadt, DE

Key dates

• Filing date: Nov 26, 2007
• Grant date: Mar 22, 2011
• Expiry date: May 2, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12535
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The radiation selective absorber coating of the invention includes two or more barrier layers arranged over each other on a substrate surface, an infrared-range reflective layer arranged on the two or more barrier layers, and at least an absorption layer arranged over the infrared-range reflective layer and a final antireflection layer arranged over the absorption layer. The absorber pipe, especially for a parabolic trough collector, is a steel pipe, on whose outer side the radiation selective absorber coating is applied. In the method of making the absorber pipe a first oxide barrier layer is provided on the outer side of the steel pipe by thermal oxidation, and then a second barrier layer, an infrared-range reflective layer, an absorption layer and a final antireflection layer are applied by gas-phase physical deposition.