Selective solar energy absorbing film system and preparation method thereof

Abstract

The invention discloses a selective solar energy absorbing film system and a preparation method thereof. The selective solar energy absorbing film system comprises a metal substrate; a top surface of the metal substrate is of an uneven microstructure; a TiAlN absorption blocking layer is deposited on the top surface of the metal substrate, a TiNxOy absorption layer is deposited on the TiAlN absorption blocking layer, a SiO2 anti-reflection layer is deposited on the TiNxOy absorption layer and an AlN anti-reflection protective layer is deposited on the SiO2 anti-reflection layer; the top surface of the metal substrate is etched by using a reactive ion beam technique to form the microstructure, thereby improving adhesion between the metal substrate and the film layer, leading to that the film layer does not fall easily and the service life of the film system is prolonged; each film layer is deposited by means of magnetron sputtering; the TiAlN absorption blocking layer is capable of preventing diffusion between the metal substrate and the TiNxOy absorption layer and thus increasing the absorption of the whole film system to solar light; the anti-reflection effect may be enhanced by means of a double-layer anti-reflection film layer composed of AlN and SiO2 having different refractive indices; the AlN anti-reflection protective layer has excellent corrosion resistance and abrasion resistance; the service life of each film layer is long in high-temperature atmospheric environments, and the service life of the selective solar energy absorbing film system thus is prolonged.

Description

technical field [0001] The invention relates to the technical field of solar photothermal conversion, in particular to a solar selective absorption film system and a preparation method thereof. Background technique [0002] Solar energy has the advantages of being widely distributed, inexhaustible and inexhaustible, and it can achieve almost no pollution to the environment. It is a sustainable and clean energy in the true sense. The utilization of solar energy is currently mainly concentrated in two categories: photothermal conversion and photoelectric conversion. A solar collector is a light-to-heat conversion device used to absorb solar radiation and convert it into heat energy. There are many kinds of solar collectors on the market, the most common one is the all-glass vacuum tube solar water heater, but it has the disadvantages of being unable to withstand pressure, easy to burst, high maintenance rate, and short service life. It does not adapt to people's requirements...

AI Technical Summary

Problems solved by technology

There are many kinds of solar collectors on the market, the most common one is the all-glass vacuum tube solar water heater, but it has the disadvantages of being unable to withstand pressure, easy to burst, high maintenance rate, and short service life.

Not suitable for people's requirements for future solar collectors

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