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Preparation method of metal/aluminum oxide solar selective absorption coating material

A technology of absorbing coatings and alumina, applied in coatings, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of low light-to-heat conversion efficiency of coating materials, unreasonable coating structure design, and coating preparation Incomplete process and other problems, to achieve the effect of no obvious performance attenuation, reasonable coating structure design, and small changes in absorptivity and emissivity

Inactive Publication Date: 2015-12-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the current research status of solar selective absorbing coatings at home and abroad, solar selective absorbing coatings are currently facing the following problems: the light-to-heat conversion efficiency of coating materials is not high; the preparation cost of coatings is high; Under certain conditions, the performance has a large attenuation; the coating preparation process is not perfect, and the coating structure design is not reasonable

Method used

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  • Preparation method of metal/aluminum oxide solar selective absorption coating material
  • Preparation method of metal/aluminum oxide solar selective absorption coating material
  • Preparation method of metal/aluminum oxide solar selective absorption coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Prepare a porous alumina template; specifically include the following sub-steps:

[0037] (1.1) Under the condition of temperature of 20°C and oxidation voltage of 20V, put the high-purity aluminum sheet in 0.3M oxalic acid solution for anodic oxidation for 6 hours;

[0038] (1.2) Put the aluminum sheet that has passed step (1.1) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 6 hours;

[0039] (1.3) Under the conditions of a temperature of 20°C and an oxidation voltage of 20V, anodize the aluminum sheet in step (1.2) in a 0.3M oxalic acid solution for 12 hours;

[0040] (1.4) Put the aluminum sheet that has passed step (1.3) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 12 hours;

[0041] (1.5) with saturated CuCl 2 solution to replace the aluminum layer on the back of the aluminum sheet; use 5wt% phosphoric acid solution to corrode the aluminum sheet at 60°C for...

Embodiment 2

[0049] (1) Prepare a porous alumina template; specifically include the following sub-steps:

[0050] (1.1) Place the high-purity aluminum sheet in 0.3M oxalic acid solution for anodic oxidation for 6 hours at a temperature of 20°C and an oxidation voltage of 40V;

[0051] (1.2) Put the aluminum sheet that has passed step (1.1) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 6 hours;

[0052] (1.3) Under the conditions of a temperature of 20°C and an oxidation voltage of 40V, anodize the aluminum sheet in step (1.2) in a 0.3M oxalic acid solution for 12 hours;

[0053] (1.4) Put the aluminum sheet that has passed step (1.3) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 12 hours;

[0054] (1.5) with saturated CuCl 2 solution to replace the aluminum layer on the back of the aluminum sheet; use 5wt% phosphoric acid solution to corrode the aluminum sheet at 60°C for 10-20 minutes...

Embodiment 3

[0062] (1) Prepare a porous alumina template; specifically include the following sub-steps:

[0063] (1.1) Place the high-purity aluminum sheet in 0.3M oxalic acid solution for anodic oxidation for 6 hours at a temperature of 40°C and an oxidation voltage of 20V;

[0064] (1.2) Put the aluminum sheet that has passed step (1.1) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 6 hours;

[0065] (1.3) Under the conditions of a temperature of 40°C and an oxidation voltage of 20V, anodize the aluminum sheet in step (1.2) in a 0.3M oxalic acid solution for 12 hours;

[0066] (1.4) Put the aluminum sheet that has passed step (1.3) in a mixture of 5wt% phosphoric acid and 2wt% chromic acid, and chemically corrode it at 60°C for 12 hours;

[0067] (1.5) with saturated CuCl 2 solution to replace the aluminum layer on the back of the aluminum sheet; use 5wt% phosphoric acid solution to corrode the aluminum sheet at 60°C for 10-20 minutes...

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Abstract

The invention discloses a preparation method of a metal / aluminum oxide solar selective absorption coating material. The preparation method comprises the following steps: taking a high-purity aluminum sheet as a base body; preparing a porous aluminum oxide mold plate on the surface of the high-purity aluminum sheet according to a twice anodic oxidation method; splashing to form a uniform Au layer on the back of the porous aluminum oxide mold plate to ensure that the porous aluminum oxide mold plate is conductive; finally, preparing Ni, Mo, Co or Fe metal nanowires on the porous aluminum oxide mold plate according to an electrochemical deposition method. The preparation method has the advantages that the production efficiency is high; the cost is low; the heat stability of a formed coating is favorable; the operating temperature can reach up to 400 DEG C, which can meet the requirement of middle-high temperature solar-thermal electric power generation.

Description

technical field [0001] The patent of the invention belongs to the technical field of solar heat collectors, and specifically relates to a preparation method of a metal / alumina solar selective absorption coating material. Background technique [0002] At present, the energy utilization of solar energy mainly includes three ways: photothermal conversion, photoelectric conversion and photochemical conversion. Compared with the solar photoelectric conversion and photochemical conversion technologies that have developed rapidly in recent years, the solar thermal conversion technology is the earliest research time, the longest research process, the most mature research results, and the most widely used solar energy utilization technology. In the solar thermal conversion technology, the solar collector is an important device that converts solar radiation into heat energy, and the solar selective absorption coating is the main functional component of the solar collector and the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12C25D15/00
Inventor 闵捷袁颂东张运华杨艳飞熊鹏
Owner HUBEI UNIV OF TECH
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