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Preparation method of solar selective absorbing coating with double-texture surface and coating

A technology for absorbing coatings and solar energy, applied in coatings, metal material coating processes, vacuum evaporation plating, etc., can solve problems such as inability to make further breakthroughs, achieve novel structures, prevent diffusion and fusion, and improve thermal stability

Active Publication Date: 2022-06-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers use catalyst technology, electrochemical treatment, hydrothermal method and other processes to build self-assembled 2D nanostructures and foam nanostructures on the surface of transition metals, Fe–Cr–Ni alloys, cermets, etc., to improve their absorption properties and high temperature stability. The results show that the reflectance is always higher than 0.1, which can effectively increase the temperature resistance of the coating to 500°C, but cannot make a further breakthrough

Method used

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  • Preparation method of solar selective absorbing coating with double-texture surface and coating
  • Preparation method of solar selective absorbing coating with double-texture surface and coating
  • Preparation method of solar selective absorbing coating with double-texture surface and coating

Examples

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preparation example Construction

[0055] Combined equipment diagram figure 1 , Schematic diagram of substrate coating morphology change figure 2 , the present invention provides a double-textured surface solar energy selective absorption coating and a preparation method thereof comprising the following steps:

[0056] (1) Preparing the experimental environment: on the radio frequency magnetron sputtering PVD equipment, press figure 1 Place sputtering target 1, arc power target 2, turntable 3, sample holder 4, and substrate 5 at the positions shown. At this time, substrate 5 is parallel to arc power target 2, and the surface of substrate 5 is flat (see figure 2 13) in (a), vacuumize by mechanical pump, molecular pump group 6, open heating tube 7 simultaneously, when vacuum degree reaches ideal value, when temperature reaches target value; Vacuum degree is generally 10 -3 Pa level, the temperature in the cavity is determined by the application and performance of the coating, generally between 100-300°C;

[...

example 1

[0075] The present invention provides a method for preparing a double-textured surface solar energy selective absorption coating. The prepared textured surface morphology can be adjusted by adjusting the substrate bias, etching time, distance between the arc power target 2 and the substrate 5, Arc power parameters, air pressure, etc., can obtain surface textures with different shapes;

[0076] combine figure 1 , image 3 , Figure 4 , taking the surface textured surface in the form of particles, stainless steel as the substrate, high-entropy alloy as the absorbing layer, and high-entropy alloy oxide as the anti-reflection layer as an example to illustrate, and verify the comparison The stainless steel substrate with only textured surface, no absorbing layer and oxide anti-reflection layer, coating with absorbing layer, anti-reflective layer on textured surface, and secondary textured surface have better spectral selectivity.

[0077] (1) Preparing the experimental environme...

example 2

[0088] combine Figure 5 , on the basis of Example 1, it was further verified that the high temperature of the solar selective absorption coating on the surface of the particle morphology double-textured surface with stainless steel as the substrate, high-entropy alloy as the absorption layer, high-entropy alloy oxide as the protective layer, and anti-reflection layer stable performance.

[0089] (1) Preparing the experimental environment: as in Example 1;

[0090] (2) The textured surface is etched on the flat stainless steel substrate: as in Example 1;

[0091] (3) Deposition of multilayer absorption coating: as in Example 1;

[0092] (4) Deposition of pure high-entropy alloy oxide anti-reflection layer: as in Example 1;

[0093] (5) The secondary textured surface is etched on the anti-reflection layer: as in Example 1;

[0094] (6) Test the properties before annealing: measure the surface morphology, reflection spectrum, such as Figure 4 , the results are analyzed as ...

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Abstract

The invention provides a preparation method of a solar selective absorbing coating with a double-texture surface and the coating. The preparation method comprises the following steps: preparing magnetron sputtering equipment, placing a sputtering target material, an arc power supply, a turntable and a substrate, vacuumizing and heating; high-purity Ar gas is introduced, negative bias voltage of the substrate is set, an arc power source is turned on, and the required texture surface is etched on the surface of the substrate through Ar under the action of the arc power source; depositing a multi-layer absorbing coating: turning off an arc power supply, rotating a turntable to enable the substrate on the turntable to be parallel to the sputtering target material, turning on a radio frequency power supply, setting parameters, simultaneously introducing high-purity Ar gas and oxygen into the chamber, sequentially setting different O2 / Ar ratios, sputtering substances of the sputtering target material, and depositing the substances on the substrate to form the gradient multi-layer absorbing coating; depositing an alloy oxide or pure metal oxide anti-reflection coating; etching a secondary texturing morphology on the surface of the anti-reflection layer through the Ar < + > ion beam; and finishing the preparation of the coating. The absorption performance and the high-temperature stability of the prepared coating are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a preparation method of a double-textured surface solar energy selective absorption coating and the coating. Background technique [0002] Solar Spectral Selective Absorber (SSA) is the most direct way to convert solar radiation into heat energy. From a thermodynamic point of view, in order to increase the efficiency of solar power generation systems, it is necessary to use concentrated solar power systems. The radiation density on the surface of the absorber will inevitably lead to an increase in its working temperature. At present, the concentrating solar energy system based on the parabolic trough requires the working temperature to be higher than 600°C, so there are strict requirements on the long-term thermal stability of the absorbing material , the design of selective absorbers capable of operating at such temperatures is a very difficult problem. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/08C23C14/14C23C14/35C23C14/54C23F4/00
CPCC23C14/08C23C14/35C23C14/14C23C14/548C23C14/0042C23F4/00Y02E10/40
Inventor 瓦西里·帕里诺维奇曾晓梅杨兵张俊张翔宇陈燕鸣黄家辉
Owner WUHAN UNIV
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