Groove type solar medium-temperature selective absorption coating
A technology of trough solar energy and absorbing coatings, applied in solar thermal power generation, solar thermal devices, layered products, etc., can solve the problems of thermal efficiency decline, collector heat loss increase, infrared emissivity increase, etc., to achieve enhanced absorption Effect, reduction of work cost, effect of high absorption rate
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[0025] The trough type solar energy medium temperature absorbing coating of the present invention comprises four layers of film, and from substrate to surface is infrared reflection layer, first absorption layer, second absorption layer and antireflection layer successively, and described infrared reflection layer is made up of Ni film, and thickness is 20-120nm; the first absorption layer is a Ni+NiAl film with a thickness of 50-75nm, and the content of NiAl is 25-35wt%; the second absorption layer is a Ni+NiAl film with a thickness of 75-150nm. Wherein the content of NiAl is 35-50wt%; the antireflection layer is a NiO film with a thickness of 25-50nm. The performance of the solar selective absorbing coating prepared by the invention is as follows: after the coating is annealed in vacuum at 400 DEG C for 1 hour, the absorption rate of the coating is 90%-92%.
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