Medium-high temperature solar selective absorption composite coating and preparation method thereof

Abstract

The invention discloses a medium-high temperature solar selective absorption composite coating and a preparation method thereof. The composite coating comprises four layers of structures from inside to outside, namely the substrate layer, the infrared reflection layer, the selective absorption layer and the antireflection layer; and the substrate layer is a stainless steel substrate, the infrared reflection layer is a metal thin film, the selective absorption layer is a CuCoMnOx spinel thin film, and the antireflection layer is a SiO2 or TiO2 thin film. The medium-high temperature solar selective absorption composite coating has a high absorption rate at the visible-near infrared wave band and has low emissivity at the medium-far infrared wave band, has good high-temperature resistance and corrosion resistance and can work stably at a medium-high temperature and meanwhile is simple in preparation process and low in cost.

Description

technical field [0001] The invention belongs to the field of solar light and heat utilization, and in particular relates to a medium-high temperature solar selective absorption composite coating and a preparation method thereof. Background technique [0002] With the development of society and economy, fossil energy is consumed in large quantities, and the energy crisis is becoming more and more serious. The solar collector is one of the core components of solar thermal utilization, and the solar spectrum selective coating on the collector is the most critical part of solar thermal conversion. The solar selective absorbing coating with excellent performance has high absorptivity in the visible-near-infrared band (0.3-2.5 μm), and low emissivity in the mid-far infrared band (2.5-25 μm). And emissivity directly affects the efficiency of solar collectors. [0003] With the continuous development of solar thermal utilization, solar thermal utilization is gradually developing f...

AI Technical Summary

Problems solved by technology

The magnetron sputtering process is advanced, the film preparation speed is fast, the film is dense, uniform, and excellent in performance, but the cost is expensive and the process requirements are high; the coating method is the most convenient, the preparation process is simple, and the cost is low, but the optical selectivity is not excellent. Limited by temperature; electroplating and electroless plating have great pollution to the environment, and at the same time, the bonding force and high temperature stability of the coating are also poor

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