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Solar selective absorbing coating on ceramic substrate surface and preparation method thereof

A technology of ceramic substrate and absorbing coating, applied in the field of solar selective absorbing coating on the surface of ceramic substrate and its preparation, can solve problems such as large heat radiation loss, and achieve the effects of reducing emissivity and preventing aggregation

Active Publication Date: 2016-07-20
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, due to the urgent need for building integrated design and the gradual maturity of ultra-thin ceramic technology, ceramic collectors have once again attracted people's attention. Relevant research institutions and enterprises in Shandong, Fujian, Guangdong and other places in my country have begun to develop, Production and sales of ceramic collectors based on vanadium-titanium black porcelain coating. Vanadium-titanium black porcelain is a kind of slag. The application of vanadium-titanium black porcelain absorbing coating has positive significance for promoting the reuse of waste resources; but vanadium-titanium black porcelain The surface emissivity of the porcelain coating is very high, reaching about 80%, and the heat radiation loss is very large

Method used

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  • Solar selective absorbing coating on ceramic substrate surface and preparation method thereof
  • Solar selective absorbing coating on ceramic substrate surface and preparation method thereof
  • Solar selective absorbing coating on ceramic substrate surface and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The film layer structure is ceramic substrate / vanadium titanium black porcelain / SiO 2 / ATO, prepared as follows:

[0030] (1) Preparation of vanadium-titanium black porcelain absorption layer: mix 100g base material, 0.1-0.5g sodium carboxymethyl cellulose and 40-80g water to obtain glaze slurry; wherein, the composition of the base material is: SiO 2 25-49%, Al 2 o 3 20-25%, Fe 2 o 3 20~25%, V 2 o 5 2-4%, TiO 2 4~8%, GaO1~3%, MgO1~3%, K 2 O1~3%, Na 2 O2 ~ 4%. The vanadium-titanium glaze slurry is applied on the surface of the blank to form a green body by the method of spraying glaze, and the green body is trimmed and dried to obtain a fine body. Send the compact into the kiln, complete sintering at a high temperature of 1200°C, and obtain a vanadium-titanium black porcelain absorbing layer after cooling;

[0031] (2) Preparation of silicon dioxide ion barrier layer: Take 50ml tetraethyl orthosilicate and add it to 200mL ethanol, adjust the pH value of the s...

Embodiment 2

[0035] Referring to Example 1, the difference is that when preparing the antimony-doped tin oxide infrared reflective layer, the volume ratio of glacial acetic acid to ethylene glycol is 1:2, and the reaction temperature is 60°C. The prepared solar selective absorbing coating has an absorptivity of 92% and an emissivity of 21%.

Embodiment 3

[0037] Referring to Example 1, the difference is that when preparing the antimony-doped tin oxide infrared reflective layer, the volume ratio of glacial acetic acid to ethylene glycol is 1:3, and the reaction temperature is 100°C. The prepared solar selective absorbing coating has an absorptivity of 90% and an emissivity of 23%.

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Abstract

Aiming at the defects of high surface emissivity, great thermal radiation loss and the like of a current vanadium-titanium black porcelain coating, the invention provides a solar selective absorbing coating on a ceramic substrate surface and a preparation method thereof. The coating comprises three layers of a vanadium-titanium black porcelain absorbing layer, a silica ion barrier layer and an antimony-doped tin oxide infrared reflecting layer in sequence. The solar selective absorbing coating on the ceramic substrate surface and the preparation method thereof have the advantages that as glycol is used as a coordination stabilizer and a solvent, hydrolytic condensation of antimony ions can be effectively controlled, the antimony ions can be prevented from coagulating due to hydrolysis and thus the doping concentration of the antimony ions is effectively controlled so that the antimony-doped tin oxide infrared reflecting layer reflects infrared radiation between 2.5 microns and 25 microns and has the reflectivity as high as 80% to achieve the purpose of reducing the emissivity of the selective absorbing coating. The solar selective absorbing coating which has an absorptivity of more than 90% and an emissivity of less than 25% can be obtained, and has positive significance for resource recycling of wastes and effective thermal utilization of solar energy.

Description

technical field [0001] The invention relates to a photothermal conversion absorbing coating, in particular to a solar selective absorbing coating on the surface of a ceramic substrate and a preparation method thereof. Background technique [0002] In recent years, due to the urgent need for building integrated design and the gradual maturity of ultra-thin ceramic technology, ceramic collectors have once again attracted people's attention. Relevant research institutions and enterprises in Shandong, Fujian, Guangdong and other places in my country have begun to develop, Production and sales of ceramic collectors based on vanadium-titanium black porcelain coating. Vanadium-titanium black porcelain is a kind of slag. The application of vanadium-titanium black porcelain absorbing coating has positive significance for promoting the reuse of waste resources; but vanadium-titanium black porcelain The surface emissivity of the porcelain coating is very high, reaching about 80%, and the...

Claims

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Application Information

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IPC IPC(8): F24J2/48
CPCY02E10/40F24S70/20
Inventor 徐雪青范玉容王毅梁柱荣徐刚
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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