A thermal spray coating anti-reflection protective layer suitable for selective absorption of medium and high temperature solar energy and its preparation method

Abstract

The invention belongs to the field of solar energy selective absorption anti-reflection materials, and particularly relates to a thermal sprayed coating anti-reflection protective layer applicable toselective absorption of medium and high-temperature solar energy and a preparation method of the thermal sprayed coating anti-reflection protective layer. The thermal sprayed coating anti-reflection protective layer consists of an inner layer and an outer layer which are compounded, wherein the inner layer is prepared from 40 weight percent of a high-absorption Co3O4-CoAl2O4 thin film, and the outer layer is prepared from 20 weight percent of low-absorption Co3O4-CoAl2O4. The thermal sprayed coating anti-reflection protective layer prepared by the preparation method disclosed by the inventionnot only has excellent optical selectivity, but also can relieve the stress action of the coating in a thermal treatment process, reduce the porosity of a thermal sprayed coating and increase an absorption-emission ratio of the coating, is relatively high in thermal stability at high temperature, also achieves protection, connection and anti-reflection effects, and is compact in structure and stable in performance.

Description

technical field The invention belongs to the field of solar energy selective absorption anti-reflection materials, and in particular relates to a thermal spray coating anti-reflection protective layer suitable for medium-high temperature selective absorption of solar energy and a preparation method thereof. Background technique As one of the most abundant energy sources on earth, solar energy is converted into various forms of energy for utilization. Among them, photothermal conversion technology is widely used in solar collectors. The surface of solar collectors is the key part of absorbing solar energy and converting them into heat energy. High absorptivity absorbs sunlight in different bands; low emissivity ensures low heat radiation loss and better retention of solar radiation. At present, there are many methods for preparing solar selective absorbing coatings at home and abroad, such as magnetron sputtering, which cannot be widely used in large-scale production due to ...

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Problems solved by technology

The solar selective absorption coating prepared by the thermal spraying process is served in a medium-high temperature atmospheric environment, and the selective absorption performance of the coating will decrease rapidly

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