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Solar selective absorption composite coating

A selective absorption and composite coating technology, applied in solar thermal power generation, coatings, solar thermal devices, etc., can solve the problems of low radiation loss, coating absorption efficiency loss, emissivity increase, etc., to achieve good repeatability and reliability Controllability, simple and convenient operation, excellent overall performance

Inactive Publication Date: 2016-10-26
南通中兴多元复合钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain an efficient absorbing coating, two main contradictions need to be solved: one is to have as high absorptivity α as possible in the solar spectrum; the other is to have as low a radiation loss as possible in the radiation wavelength range, that is, low emissivity ε
[0003] At present, in the selective coatings widely used in our country, when the temperature is high, the emissivity increases sharply with the temperature, and the metal components in the film layer are easy to diffuse in high temperature, causing the aging and peeling of the film layer, resulting in the coating Loss of layer absorption efficiency and shortened service life

Method used

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Examples

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Effect test

Embodiment 1

[0018] Instrument preparation

[0019] A magnetron sputtering apparatus model JGP500A, equipped with three Φ75mm permanent magnet magnetron targets, with a maximum sputtering power of 500W; a four-station sample turntable with revolution function, which can realize co-sputtering of three targets Experiment; samples can be heated or water-cooled, the maximum temperature can reach 700°C, and the heating rate can be adjusted from 10°C / min to 50°C / min, which is suitable for preparing films of various materials; the vacuum system is equipped with a 2XZ- 8 (8L / S) mechanical pump and FF-200 / 1200 turbo molecular pump, the highest vacuum degree can reach 7.0×10 -6 Pa.

[0020] Material preparation

[0021] The sputtering targets are Al, 99.99wt% Ag and 99.9wt% Ta with a purity of 99.9wt%, and the diameters are all 75mm; the substrate is a polished metal Cu sheet.

[0022] Coating preparation: Two sets of identical nano-multilayer gradient solar spectrum selective absorption coatings...

Embodiment 2

[0031] According to the method described in Example 1, the nanometer multilayer gradient solar spectrum selective absorption coating is prepared, wherein when the absorption layer is deposited, three layers of gradient absorption layers are selected: take AlN-Ag as a deposition period, set the period value to 3, select Determine the ratio of the sub-layers, deposit the AlN layer and the Ag layer sequentially according to the single-layer absorption layer deposition method, and the deposited three-layer gradient film absorption layers are AlN20nm-Ag5nm / AlN30nm-Ag5nm / AlN40nm-Ag5nm respectively.

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Abstract

The invention discloses a solar selective absorption composite coating, which comprises, successively, a bottom metal sheet, a heat absorption layer, an absorption layer and an antireflection layer; wherein the heat diffusion barrier layer is a Ta nanolayer; the absorption layer is an AlN-Ag nanolayer; and the antireflection layer is an AlN nanolayer. In the invention, by introducing the high-melting point metal Ta into the absorption layer as a absorption layer, the thermostability and the interface bonding strength of the coating are improved evidently. The coating disclosed by the invention achieves the advantages of simple and convenient operation, good controllability, cleanness and non-pollution, and is suitable for large-scale industrialization.

Description

technical field [0001] The invention relates to a solar spectrum selective absorption coating, and also relates to a preparation method of the solar spectrum selective absorption coating, which belongs to the technical field of vacuum coating. Background technique [0002] The utilization of solar energy is a preface topic in the field of current energy material utilization. Solar energy has the advantages of renewable energy, clean, pollution-free, safe and inexhaustible. Converting low-grade solar energy into high-grade thermal energy is a key technology in solar thermal utilization. A solar collector is a device that can convert solar energy into heat energy. Its core part is a surface selective absorption coating, which absorbs most of the light waves in the ultraviolet to near-infrared range of solar energy, while in the infrared band it is strong. Reflection, its own infrared radiation rate is very low, it is the core material of solar collectors. In order to obtain ...

Claims

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Application Information

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IPC IPC(8): C23C28/00F24J2/48
CPCC23C28/324C23C28/34C23C28/36F24S70/25F24S70/225F24S70/30Y02E10/40
Inventor 宗亚娟
Owner 南通中兴多元复合钢管有限公司
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