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Non-vacuum high temperature solar selective absorbing coating composite anti-reflection coating and preparation method thereof

An absorption coating, medium and high temperature technology, applied in the field of non-vacuum medium and high temperature solar selective absorption coating composite anti-reflection film and its preparation, to achieve the effects of excellent mechanical properties, convenient operation and improved service life

Inactive Publication Date: 2013-09-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a non-vacuum medium-high temperature solar energy selectivity with high temperature resistance and high stability under non-vacuum conditions, which can increase the absorption rate of the coating and increase the service life for the natural environment of the tower heat absorber system. Absorbing coating composite anti-reflection film and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Configure Al 2 o 3 Sol and SnO 2 sol

[0021] Al 2 o 3 Preparation of sol: Using deionized water and aluminum isopropoxide as raw materials, stir magnetically at 80°C for 1 hour, add nitric acid to adjust the pH value to 4 while stirring, and reflux at 95°C for 16 hours to prepare a concentration of 0.6 mol / L Al 2 o 3 Sol; SnO 2 Preparation of sol: Using deionized water and crystalline tin tetrachloride as raw materials, magnetically stir at 60°C until dissolved, then add diluted ammonia water to adjust the pH value to 1.35 to obtain SnO with a concentration of 0.6mol / L 2 Sol, ammonia water is prepared according to the molar ratio of pure ammonia water and deionized water 1:2;

[0022] 2) Processing of stainless steel substrate

[0023] Put the stainless steel substrate sample into the alkaline cleaning solution, heat to 90°C and clean for 10 minutes. Take out the sample and wash it in deionized water for 5 minutes, then put it in the pickling solution for ...

Embodiment 2

[0029] 1) Configure Al 2 o 3 Sol and SnO 2 sol

[0030] al 2 o 3 Preparation of sol: Using deionized water and aluminum isopropoxide as raw materials, stir magnetically at 80°C for 1 hour, add nitric acid to adjust the pH value to 5 while stirring, and reflux at 95°C for 16 hours to prepare a concentration of 0.3 mol / L Al 2 o 3 Sol; SnO 2 Preparation of sol: Using deionized water and crystalline tin tetrachloride as raw materials, magnetically stir at 60°C until dissolved, then add diluted ammonia water to adjust the pH value to 1.15 to obtain SnO with a concentration of 0.3mol / L 2 Sol, ammonia water is prepared according to the molar ratio of pure ammonia water and deionized water 1:2;

[0031] 2) Substrate pretreatment

[0032] Put the stainless steel substrate sample into the alkaline cleaning solution, heat to 90°C and clean for 10 minutes. Take out the sample and wash it in deionized water for 5 minutes, then put it into the pickling solution for 2 to 5 minutes,...

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Abstract

The present invention relates to a non vacuum high temperature solar selective absorbing coating composite anti-reflection coating and a preparation method thereof, wherein the method comprises the following steps: (1) preparing A1203 colloidal sol and Sn02 colloidal sol; (2) putting the sample into A1203 colloidal sol to form A1203 film via sol-gel dip-coating and heat treatment; after curing and polishing of the A1203 colloidal sol, doing sol-gel dip-coating for anther time, and keeping the A1203 colloidal sol unthickened and completely sealed; putting the sample plated with A1203 film into Sn02 colloidal sol to form Sn02 film via sol-gel dip-coating and heat treatment, and keeping the thickness of the Sn02 colloidal sol when doing sol-gel dip-coating for another time after polishing the surface with flannelette, whereby the composite anti-reflection coating is obtained. The present method has high infrared reflectivity, prolonged service life of the coating, and is suitable for medium-high temperature working environment. Additionally, the bi-layer thin film has simple preparation technology, easy controlling, short production cycle and convenient operation.

Description

technical field [0001] The invention relates to a non-vacuum high-temperature solar selective absorption coating composite anti-reflection film and a preparation method thereof. Background technique [0002] With the rapid development of solar technology and the increasing shortage of energy, solar power generation is required to have higher efficiency and longer service life. Medium and high temperature solar spectrum selective absorption coating refers to the coating that can withstand high temperature of 300 ℃ and above, and can work normally in the range of this temperature and room temperature for a long time, maintaining a high solar absorption rate α and a low emissivity ε Selective absorbing coating, which is a frontier topic in current solar thermal utilization. In the past 20 to 30 years of research on solar energy utilization in China, most of the research results are limited to low temperature applications (<300°C), such as solar water heaters, solar dryers, ...

Claims

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Application Information

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IPC IPC(8): C23C20/08F24J2/48B32B9/04
CPCF24S70/225F24S70/30Y02E10/40
Inventor 程旭东张朴宫殿清向泓宇孟晓明
Owner WUHAN UNIV OF TECH
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