Medium-high temperature solar selective absorbing composite coating and preparation thereof

Abstract

The invention relates to a medium-high temperature solar selective absorbing composite coating and preparation thereof. The preparation of the coating comprises the following steps that: TiO2 (titanium dioxide) is coated on a PbS coating to be served as a protective layer to form a TiO2 / PbS composite coating, the oxidation of the PbS coating is delayed, the service life of the PbS coating is prolonged, and the corrosion resistance, the wear resistance, the temperature resistance, the self-cleaning performance of the PbS coating are improved; and the aims of reducing emissivity and prolonging the service life of the coating are reached under the condition that the absorptivity is not obviously influenced. The medium-high temperature solar selective absorbing composite coating disclosed by the invention is suitable to a solar collector tube and a flat-plate type solar heat-collecting plate core, and can be applied to solar photo-thermal use and solar photovoltaic use, such as a solar water heater, a solar house, solar power generation and the like.

Description

technical field [0001] The invention belongs to the field of thin-film technology and thin-film materials, and in particular relates to a high-temperature selective absorption film in solar spectrum. Background technique [0002] The medium and high temperature solar spectrum selective absorption coating refers to the selective absorption coating that can withstand high temperatures above 200 ° C, and can work normally within the range of room temperature for a long time, maintaining a high a and a low ε. It is the frontier topic in the current solar thermal utilization. In the past 20 to 30 years of research on solar energy utilization in China, most of the research results are limited to low temperature applications (<100°C), such as solar water heaters, solar dryers, and solar houses. From a long-term point of view, the integration of solar energy and buildings is one of the important development directions of solar thermal utilization. The coating materials used in t...

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Problems solved by technology

[0004] In order to overcome the shortcoming that when the pbs coating is mixed with alkali, the sulfur element in the pbs and the oxygen in the air generate sulfate radicals to reduce the absorptivity of the coating and greatly increase the emissivity, the purpose of the invention is to cover a pbs coating surface with a Layer or several layers of TiO 2 thin film, which can significantly improve the performance of the PBS coating, improve the self-cleaning function of the coating, and achieve the purpose of reducing the emissivity and prolonging the life of the coating without significantly affecting the absorptivity

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