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Method using ion nitriding technology to prepare solar energy absorbing coating

A technology of solar energy absorption and ion nitridation, which is applied in the field of preparation of solar energy absorption coatings, can solve the problems of expensive operation, complex equipment, slow hot start, etc., and achieve the effects of simplifying the process, reducing production costs and reducing heat loss

Inactive Publication Date: 2009-11-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is that the existing solar energy absorbing coating aluminum nitride is prepared by magnetron sputtering method on the glass tube, the thermal start is slow when in use, the equipment used in the production is expensive and the operation is complicated, based on Therefore, the applicant provides a method of applying ion nitriding process to prepare solar absorbing coating

Method used

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  • Method using ion nitriding technology to prepare solar energy absorbing coating
  • Method using ion nitriding technology to prepare solar energy absorbing coating
  • Method using ion nitriding technology to prepare solar energy absorbing coating

Examples

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Embodiment 1

[0024] 1. First, use chemical treatment to clean the surface of the aluminum alloy tube to make it chemically react with oil, dirt, rust, scale, and oxide film to form soluble substances, so that the surface of the aluminum alloy tube to be treated is smooth and clean. Specific steps are as follows:

[0025] (1) Etching the aluminum alloy pipe with a NaOH solution with a concentration of 8%-10% and a solution temperature of 40°C-60°C for 10-15 minutes;

[0026] (2) Rinse with cold water for about 2 minutes;

[0027] (3) neutralize in a dilute nitric acid solution with a volume fraction of 30%, so that the surface of the aluminum alloy tube is smooth and clean;

[0028] (4) Rinse with hot water at 50°C to 60°C for 2 to 3 minutes, and brush with a hard brush;

[0029] (5) Dry it in a drying oven at 100°C to 150°C for about 30 minutes, and set it aside.

[0030] 2. Ion nitriding treatment on the surface of aluminum alloy tube

[0031] 1. Furnace loading: seal both ends of the...

Embodiment 2

[0037] According to the method of Example 1, a net-like sponge-type porous graphite source was added in the ion nitriding furnace, and ion nitriding treatment was performed on the surface of the aluminum alloy tube. When the temperature rises to 350°C, adjust the graphite electrode voltage to 400V, carry out ion nitriding, and keep the temperature for 2 hours. After slowly cooling out of the furnace, a gradient AlN-Al composition gradient is formed on the surface of the aluminum alloy tube, which is the solar energy absorbing coating.

[0038] The light-to-heat conversion efficiency of the aluminum nitride coating prepared in this example without a vacuum insulation layer is 92.4% of that of the existing solar vacuum heat collecting tube finished product.

Embodiment 3

[0040]According to the method of Example 1, a grid-shaped sponge-type porous graphite electrode was added in the ion nitriding furnace, and ion nitriding treatment was performed on the surface of the aluminum alloy tube. After sputtering and cleaning at a pressure of 40Pa and a voltage of 550V, 99.99% high-purity nitrogen is introduced, the volume ratio of argon and nitrogen is controlled to be 0.4, the pressure is increased to 400Pa, the power supply voltage is adjusted to 700V, and the graphite electrode voltage is adjusted. 500V, keep the temperature at 450°C, perform ion nitriding on the surface of the aluminum alloy tube, keep it warm for 1 hour, and form a gradient AlN-Al with a gradient change on the surface of the aluminum alloy tube, which is the solar absorbing coating.

[0041] The light-to-heat conversion efficiency of the aluminum nitride coating prepared in this example without a vacuum insulation layer is 91.6% of the finished product of the existing solar vacuum...

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Abstract

The invention relates to a method using an ion nitriding technology to prepare a solar energy absorbing coating. In the method, an aluminum alloy tube is used as a cathode, and a gradually-varied aluminum nitride / aluminum (A1N-A1) solar energy absorbing coating with compositional gradient change is formed on the surface of the aluminum alloy tube by utilizing the ion nitriding technology. The method introduces a graphite source, enhances the heat absorbing efficiency of an aluminum nitride coating, increases solar absorbing efficiency and has the advantages of high seeping speed, uniform seeping layer, simple equipment, low cost, and the like.

Description

technical field [0001] The invention relates to a method for preparing a solar absorbing coating, in particular to a method for preparing a solar absorbing coating on the surface of an aluminum alloy tube by using an ion nitriding process. Background technique [0002] The "Acta Solaris Sinica" sponsored by the China Renewable Energy Society, in January 2001, publicly reported the "light-thermal performance of the all-glass vacuum solar collector tube", which introduced the pre-prepared aluminum film bottom layer on borosilicate glass 313 (BJ2TY), A solar absorbing coating process in which graded aluminum-nitrogen composite films are used as the absorbing layer and aluminum-oxygen dielectric films are used as the antireflection layer is prepared by single-target magnetron sputtering technology. Among them, the absorption rate α of the multilayer (gradient) AlN / Al selective absorption coating can reach 0.93, and the reflectance ε is about 0.05. Multi-layer (gradient) AlN / Al ...

Claims

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Application Information

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IPC IPC(8): C23C8/36F24J2/48
CPCY02E10/40F24J2/487F24S70/25F24S70/225
Inventor 陟成刚王超唐宾张翔宇刘俊谢燕翔
Owner TAIYUAN UNIV OF TECH
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