RADIATION- SELECTIVE ABSORBER COATING AND ABSORBER TUBE WITH RADIATION- SELECTIVE ABSORBER COATING

摘要

pThe radiation-selective absorber coating (20) comprises a reflective layer that reflects in the infrared range, barrier layers (24a, 24b, 24c) arranged below the reflective layer, an absorption layer (22) arranged above the reflective layer, an antireflection layer (23) arranged above the absorption layer, and an adhesion-enhancing layer (25) arranged between the barrier layer and the reflective layer. The second of the two barrier layers consists of aluminum oxide compound (Al xO y), where x is 1 or 2 and y is 1, 2 or 3, and silicon oxide compound (SiO x), where x is 1-2. The radiation-selective absorber coating (20) comprises a reflective layer that reflects in the infrared range, barrier layers (24a, 24b, 24c) arranged below the reflective layer, an absorption layer (22) arranged above the reflective layer, an antireflection layer (23) arranged above the absorption layer, and an adhesion-enhancing layer (25) arranged between the barrier layer and the reflective layer. The second of the two barrier layers consists of aluminum oxide compound (Al xO y), where x is 1 or 2 and y is 1, 2 or 3, and silicon oxide compound (SiO x), where x is 1-2. The adhesion-enhancing layer has a thickness of 5-50 nm. The reflective layer has a thickness of 80-150 nm. Independent claims are included for: (1) an absorber tube for a parabolic trough collector; and (2) a method of operating a parabolic trough collector./p [EP2253737A1]