Medium-high temperature solar selective absorption composite coating and preparation method thereof
A composite coating and selective technology, which is applied in the field of solar thermal utilization, can solve the problems of poor coating adhesion and high temperature stability, poor optical selectivity, and limited temperature tolerance, so as to improve the overall corrosion resistance and high Selective absorption capacity, effect of improving binding degree
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[0048] Example
[0049] The solar selective absorption composite coating of this embodiment has a four-layer structure, and from bottom to top are the substrate, the infrared reflective layer, the selective absorption layer and the anti-reflection layer; the substrate is a highly polished 304 stainless steel substrate, The infrared reflection layer is a metal Ti film, the selective absorption layer is a CuCoMnOx spinel film, and the anti-reflection layer is a SiO2 film; the infrared reflection layer is prepared by magnetron sputtering, and the selective absorption layer and the anti-reflection layer are both sol-coagulated Prepared by glue method.
[0050] The preparation method of the solar selective absorption composite coating is as follows:
[0051] Step 1. Preparation of CuCoMnOx composite sol A: Weigh 3.62g copper nitrate trihydrate, 1.46g cobalt nitrate hexahydrate and 3.67g manganese acetate tetrahydrate and dissolve into 100ml ethanol, stir magnetically until completely dis...
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