Solar absorber coating and method for producing such a solar absorber coating

摘要

Solar absorption coating comprises a (semi)metal oxide component to which particles are added to form a layer that absorbs light to generate heat. Independent claims are also included for: (1) process (P1) for producing a solar absorption coating from a mixed oxide gel, where at least two metal alkoxides and preferably a metal salt are incorporated as sol-gel precursors; (2) process (P2) for producing a solar absorption coating by mixing a silica dispersion with an alumina or titanium dioxide matrix precursor in the form of a metal alkoxide and optionally adding a metal salt; (3) process (P3) for producing a titanium dioxide layer by a sol-gel process comprising applying a titanium dioxide sol containing 40-95% silver, heating to 180-350[deg] C for 3-15 minutes, applying a titanium dioxide layer, heating to 300-500[deg] C for 5-30 minutes, heating to 400-600[deg] C for 3-15 minutes, preferably applying a zinc oxide layer and preferably heating to 300-450[deg] C for 5-30 minutes.