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Preparing method of solar-energy selective absorption coating

An absorbing coating and selective technology, which is applied in the field of solar energy utilization, can solve the problems of poor bonding force and high temperature stability of the coating, poor optical selectivity of the coating, and large environmental pollution of the electroplating bath, so as to improve the bonding firmness, Improved overall corrosion resistance and low processing costs

Inactive Publication Date: 2015-02-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods, they all have advantages and disadvantages, and only a few are put into production practice
The sputtering technology is advanced, the film preparation speed is fast, the film is dense and uniform, and some scholars have used this method to prepare high-temperature solar energy selective absorption coatings, which have excellent performance, but the cost is expensive and the process requirements are high; the coating method is the most convenient and the preparation process is simple , the cost is low, but organic adhesives are often added to the coating, so that the optical selectivity of the coating is not excellent, and the temperature resistance is limited; the electroplating bath has a large environmental pollution, and the coating has poor adhesion and high temperature stability; chemical The plating cost is low and the preparation method is simple, but the coating has the same disadvantages as the electroplating coating; the traditional sol-gel method has simple processing technology and low cost, but the film adhesion performance is poor, and it is difficult to realize the application in the high temperature field. These factors all restrict heat utilization of solar energy

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  • Preparing method of solar-energy selective absorption coating
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  • Preparing method of solar-energy selective absorption coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Solar energy selective absorbing coating with double-layer structure

[0050] In the double-layer structure of the coating, the first layer is the base material, and the second layer is the composite oxide absorption layer, arranged from bottom to top. The substrate is a stainless steel substrate, and the composite oxide absorption layer is Cu 1.5 mn 1.5 o 4 Composite oxide film, the anti-reflection layer is TiO 2 Film; the composite oxide absorbing layer and the anti-reflection layer are prepared by sol-gel method.

[0051] The above-mentioned stainless steel substrate is treated as the base material, or the heat collecting pipe made of stainless steel that is directly treated without adding a bright metal bottom layer is used as the base material.

Embodiment 2

[0052] Example 2: Solar energy selective absorbing coating with three-layer structure

[0053] In the three-layer structure of the coating, the first layer is the base material, the second layer is the composite oxide absorbing layer, and the third layer is the anti-reflection layer, arranged from bottom to top; the base material is a stainless steel substrate, composite The oxide absorber layer is Cu 1.5 mn 1.5 o 4 Composite oxide film, the anti-reflection layer is TiO 2 Film; the composite oxide absorbing layer and the anti-reflection layer are prepared by sol-gel method.

[0054] The above-mentioned stainless steel substrate is treated as the base material, or the heat collecting pipe made of stainless steel that is directly treated without adding a bright metal bottom layer is used as the base material.

[0055] In above-mentioned embodiment 1 and 2, absorbing layer adopts Cu 1.5 mn 1.5 o 4 , with high solar absorption performance. Its crystallization temperature i...

Embodiment 3

[0057] Operation steps: Put the base material in 90°C alkaline washing solution for alkaline washing for 5 minutes, ultrasonic cleaning in 70°C deionized water for 5 minutes, then put the base material in 80°C pickling solution for pickling and activation for 3 minutes, and finally at 30°C Ultrasonic cleaning in deionized water for 5 min. Take 0.04molCu(NO 3 ) 2 , Mn(NO 3 ) 2 Dissolve in 100ml of deionized water, dissolve 0.16mol of citric acid in 100ml of deionized water, slowly add citric acid into the salt solution, and stir at constant temperature at 70°C for 6h to prepare 100ml of sol. Take 1 g of hydroxypropyl cellulose and add it into the sol, stir at room temperature for 2 hours and set aside. The coating was pulled once at a pulling speed of 20mm / min, and dried at 120°C. Put the sample after pulling and coating into the muffle furnace, raise the temperature at a rate of 1°C / min, and finally anneal at 550°C for 2 hours to prepare a solar selective absorbing coatin...

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Abstract

The invention relates to a solar-energy selective absorption coating and its preparing method. The coating is structured in double layers or three layers: the first layer is a polished stainless steel substrate, the second layer is a Cu1.5Mn1.5O4 composite oxide absorption layer, the third layer is an anti-reflection coating formed by a TiO2 film, and the three layers are arranged from bottom to top. The absorption layer and the anti-reflection coating are both prepared by steps of dip-pulling plating by a sol-gel method and annealing. The preparation method of the coating contains steps of composite oxide absorption layer preparation and anti-reflection coating preparation, wherein a preparation method of the composite oxide absorption layer contains the step of sol and thin film preparation and a preparation method of the anti-reflection coating contains steps of composite oxide absorption layer surface cleaning, sol preparation and anti-reflection coating thin film preparation. The coating provided by the invention has visible-near infrared high absorptivity, mid-far-infrared low emissivity and good high temperature resistance and corrosion resistance, is suitable for the operating temperature of 100-500 DEG C, and simultaneously requires a simple production technology and low processing cost.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, in particular to a method for preparing a selective absorption coating on the surface of a non-vacuum high-temperature solar heat collection tube. Background technique [0002] Thermal utilization of solar energy is an important form of solar energy utilization. With the country's investment in energy saving and emission reduction, and the problem of energy shortage gradually surfaced, the research on the thermal utilization of solar energy is becoming more and more extensive. [0003] The thermal utilization of solar energy is generally achieved by preparing a solar selective absorption coating on the surface of the heat collector. The solar selective absorbing coating with excellent performance maintains high absorptivity in the visible-near infrared band (0.3-2.5 μm), and has low emissivity in the mid-far infrared band (2.5-25 μm). The absorptivity and emissivity of the sola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B15/18C23C20/08
Inventor 程旭东闵捷马涛叶卫平黄伟王涛王珂王辉万倩李光磊宫殿清
Owner WUHAN UNIV OF TECH