Preparation method of AAO photonic crystal based high-temperature-resistant ternary nano composite heat-absorbing coating

A photonic crystal and nano-composite technology, applied in anodic oxidation and other directions, can solve the problems of low solar spectral absorptivity, infrared emissivity, high-temperature thermal stability, etc., and achieve high-temperature resistance, wide material sources, and strong coating adhesion. Effect

Inactive Publication Date: 2018-03-09
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the existing method for preparing solar energy absorbing coatings by anodic oxidation, and to provide a method for preparing AAO photonic crystal-based high-temperature-resistant ternary nanocomposite heat-absorbing coatings, which has a wide range of material sources, strong coating adhesion, High solar spectrum absorptivity, low infrared emissivity, good thermal stability at high temperature

Method used

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  • Preparation method of AAO photonic crystal based high-temperature-resistant ternary nano composite heat-absorbing coating
  • Preparation method of AAO photonic crystal based high-temperature-resistant ternary nano composite heat-absorbing coating
  • Preparation method of AAO photonic crystal based high-temperature-resistant ternary nano composite heat-absorbing coating

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Pretreatment of the aluminum alloy sample: put the aluminum alloy sample in 45g / L NaOH, 1g / LC at a temperature of 70°C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 3 minutes. Rinse the sample after alkali etching with water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 4 minutes, the acid-treated test piece was rinsed with ultrapure water, and then the AAO photonic crystal was prepared.

[0028] (2) Preparation of AAO photonic crystal: put the aluminum alloy sample into 2 SO 4 , Do periodic variable voltage oxidation in the electrolyte, and the cathode plate is made of high-purity lead plate. The voltage change in each cycle is mainly divided into 5 stages, and the corresponding time parameters are: t 1 =32s,t 2 =32s,t 3 = 20s, t 4 =56s,t 5 = 128s; t 0 =300s is the initial oxidation period, and the voltage at the initial stage plays a certain role in compensating for the drift of the photon forbidden band in the...

Embodiment 2

[0034] (1) Pretreatment of the aluminum alloy sample: put the aluminum alloy sample in 45g / L NaOH, 1g / LC at a temperature of 70°C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 3 minutes. Rinse the sample after alkali etching with water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 4 minutes, the acid-treated test piece was rinsed with ultrapure water, and then the AAO photonic crystal was prepared.

[0035] (2) Preparation of AAO photonic crystal: put the aluminum alloy sample into the 2 SO 4 , Do periodic variable voltage oxidation in the electrolyte, and the cathode plate is made of high-purity lead plate. The voltage change in each cycle is mainly divided into 5 stages, and the corresponding time parameters are: t 1 = 36s, t 2 =32s,t 3 = 25s, t 4 =70s;t 0 =800s is the initial oxidation stage voltage, and the initial stage voltage plays a certain role in compensating for the drift of the photonic band gap in the subsequent...

Embodiment 3

[0040] (1) Pretreatment of the aluminum alloy sample: put the aluminum alloy sample in 45g / L NaOH, 1g / LC at a temperature of 70°C 12 h 25 SO 4 Alkaline etching in a mixed solution of Na for 3 minutes. Rinse the sample after alkali etching with water and put it in 10% H 2 SO 4 , 4% HNO 3 Pickling in the mixed solution for 4 minutes, the acid-treated test piece was rinsed with ultrapure water, and then the AAO photonic crystal was prepared.

[0041] (2) Preparation of AAO photonic crystal: put the aluminum alloy sample into 2 SO 4 , Do periodic variable voltage oxidation in the electrolyte, and the cathode plate is made of high-purity lead plate. The voltage change in each cycle is mainly divided into 5 stages, and the corresponding time parameters are: t 1 = 40s, t 2 = 36s, t 3 = 25s, t 4 =70s,t 5 = 128s; t 0 =2400s is the initial oxidation period, and the voltage in the initial period plays a certain role in compensating for the drift of the photonic band gap in t...

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Abstract

The invention discloses a preparation method of an AAO photonic crystal based high-temperature-resistant ternary nano composite heat-absorbing coating. The coating prepared by adopting the method is simple in process operation, is 0.84-0.94 in absorptivity and 0.12-0.21 in emissivity and has high solar absorptivity. After being thermally treated at 100-600 DEG C, a sample coating is comparativelytable in absorptivity and emissivity. The coating is high in solar spectrum absorptivity, low in emissivity, extensive in material source, firm in binding force and good in resistance to high temperature. The coating can be applied in the field of solar water heaters, solar cooker heat collection, high-temperature power generation and seawater desalination.

Description

technical field [0001] The invention relates to a method for preparing an AAO photonic crystal-based high-temperature-resistant ternary nano-composite heat-absorbing coating, which combines an anodic oxidation technology with an alternating current electrodeposition technology to prepare a high-temperature-resistant nano-composite heat-absorbing coating, especially relates to anodic oxidation The prepared AAO photonic crystal is used as the basis, and the solar energy absorption and high temperature resistant nano composite absorption coating is prepared by using appropriate electrodeposition parameters and appropriate deposition liquid formula, which belongs to the technical field of solar heat absorption materials. Background technique [0002] The main method of direct utilization of solar energy is photothermal conversion technology. Photothermal conversion technology is widely used in solar collectors, and the solar absorbing coating is a key component of the collector....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D11/08C25D11/20
CPCC25D3/562C25D11/08C25D11/20
Inventor 陈东初魏红阳常萌蕾户华文
Owner FOSHAN UNIVERSITY
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