Thermal spraying coating layer antireflection layer suitable for solar selective absorption and preparation method thereof

Abstract

The invention belongs to the field of coating layer antireflection materials, and in particular, relates to a thermal spraying coating layer antireflection layer suitable for solar selective absorption and a preparation method thereof. The thermal spraying coating layer antireflection layer consists of a single CuMnOx layer, or consists of composite two layers: an inner layer of a CuMnOx layer and an outer layer of a SnO2 layer. The CuMnOx layer is prepared by CuMnOx composite sol; and the CuMnOx composite sol is prepared by mixing nanometer solid particles in an amorphous state with CuMnOx sol. The thermal spraying coating layer antireflection layer, prepared by the method, has excellent optical selection performance, can relieve the stress effect of a coating layer in the heat treatment process, decreases the porosity of the thermal spraying coating layer, improves the absorption emitting ratio of the coating layer, is better in heat stability under high temperature, achieves multiple effects of hole sealing, protection and reflection reduction, and is compact in structure and stable in performance.

Description

technical field [0001] The invention belongs to the field of coating anti-reflection materials, in particular to a thermal spray coating anti-reflection layer suitable for selective absorption of solar energy and a preparation method thereof. Background technique [0002] Solar energy is a clean energy with huge reserves and no pollution. Solar thermal utilization technology has been widely used in low-temperature fields, such as solar water heaters; in the medium-high temperature field, there is a big gap between China and foreign countries. The commercial operation is slow, and there are many existing preparation methods for solar selective absorption coatings, such as magnetron sputtering, which are only suitable for vacuum environments and cannot meet the needs of medium and high temperature environments in atmospheric environments. The cost is expensive and the process requirements are high. Only a few can be put into actual production practice, high temperature resista...

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Problems solved by technology

However, thermal spraying coatings have problems such as insufficiently dense structure and high porosity. The existence of pores makes the coating prone to oxidation under high temperature conditions in the atmosphere, resulting in peeling off of the coating, reduced weather resistance of the coating, increased infrared emissivity, and reduced coating. The service life and optical performance of the layer, so it is necessary to seal the absorbing layer coating; the multi-layer coating structure has a better absorption-emission ratio, so after sealing the coating, add a layer of anti-reflection layer to increase Large visible light transmittance, reduce reflection, thereby increasing the absorptivity of the coating in the visible light region, and further improving the selective absorption performance of the coating. Common anti-reflection layers such as TiO 2 , SnO 2 , SiO 2 Wait

[0003] The solar selective absorbing layer prepared by the thermal spraying process will be severely corroded in the non-vacuum environment for a long time, and the weather resistance and thermal stability of the coating in the medium and high temperature environment will be deteriorated. Although the common anti-reflection layer can increase the visible light region Transmittance, but the protective effect on the coating is not ideal, and there are many restrictions on the selection of materials, it is difficult to obtain satisfactory results; the multilayer structure coating has the phenomenon of increased surface stress during the sintering process, making Cracks appear in the coating at the later stage of sintering, which affects the final optical selective absorption performance of the coating

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