Weather-resistance and high-efficiency solar selective absorbing coating layer and preparation method thereof

Abstract

The invention discloses a weather-resistance and high-efficiency solar selective absorbing coating layer. The coating system has a four-layer structure of TiCrMoN / CrMoON / CrON / SiON from inside to outside, wherein an infrared reflecting layer TiCrMoN coating layer comprises the following components: 28-32 at.% of Ti, 18-24 at.% of Cr, 4-10 at.% of Mo, and 43-47 at.% of N; an absorbing layer CrMoON comprises the following components: 35-43 at.% of Cr, 9-16 at.% of Mo, 6-12 at.% of O, and 35-40 at.% of N; an anti-reflecting layer CrON comprises the following components: 42-52 at.% of Cr, 7-12 at.% of O, and 39-48 at.% of N; and an anti-reflecting layer SiON comprises the following components: 36-42 at.% of Si, 12-20 at.% of O, and 40-49 at.% of N. The selective coating layer is excellent in weather resistance, and is excellent in selective absorbing characteristic under the conditions of temperature change, salt spray corrosion and ultraviolet irradiation; the absorbing coefficient is higher than 0.94; and the emitting coefficient is lower than 0.20. The coating layer is excellent in selective absorbability, strong in weather resistance, environment-friendly in preparation method, suitable for industrial production and significant in application prospect in the aspect of building integration of flat-plate solar collectors.

Description

technical field [0001] The invention belongs to the field of thin film materials, and in particular relates to a weather-resistant high-efficiency solar selective absorption coating and a preparation method thereof. Background technique [0002] It is the development trend of solar water heaters to use solar energy to solve the energy for hot water, heating, air conditioning and lighting in buildings in an all-round way so as to realize the integration of solar materials and buildings. The integration of solar energy and buildings is not a simple addition of solar energy and buildings, but to make solar energy a part of the building. While providing hot water for users, solar energy also plays a role in the energy saving and emission reduction of the entire building. The flat plate collector plays a vital role in the promotion of solar energy and building integration. Flat-plate collectors are currently growing at an annual rate of 200%. Three years later, the annual promot...

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Problems solved by technology

[0004] However, there are two major disadvantages in the heat-absorbing layer of domestic flat-panel solar water heaters. The heat-absorbing surface of the collector is mostly a non-selective absorbing surface, which leads to the thermal emissivity of the heat-absorbing surface at higher temperatures that cannot be ignored, thus making the water heater system less efficient. Secondly, the preparation methods of its absorbing surface are mostly processes such as brushing and electroplating, which will cause environmental pollution, and some processes also have shortcomings such as easy peeling of the coating

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