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Thermal sprayed coating anti-reflection protective layer applicable to selective absorption of medium and high-temperature solar energy and preparation method of thermal sprayed coating anti-reflection protective layer

A technology of thermal spraying and protective layer, applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve problems such as the decline of the absorption performance of the coating, improve the surface state, increase the absorption rate, reduce the infrared The effect of emissivity

Inactive Publication Date: 2018-06-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The solar selective absorption coating prepared by the thermal spraying process is served in a medium-high temperature atmospheric environment, and the selective absorption performance of the coating will decrease rapidly

Method used

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  • Thermal sprayed coating anti-reflection protective layer applicable to selective absorption of medium and high-temperature solar energy and preparation method of thermal sprayed coating anti-reflection protective layer
  • Thermal sprayed coating anti-reflection protective layer applicable to selective absorption of medium and high-temperature solar energy and preparation method of thermal sprayed coating anti-reflection protective layer
  • Thermal sprayed coating anti-reflection protective layer applicable to selective absorption of medium and high-temperature solar energy and preparation method of thermal sprayed coating anti-reflection protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of anti-reflection protective layer suitable for solar energy selective absorption Co-WC thermal spray coating is prepared by the following method:

[0028] (1) 40wt%Co 3 o 4 -CoAl 2 o 4 The preparation of sol: weigh 6.909g Co(NO 3 ) 2 ·6H 2 O, 3.918gC 9 h 21 AlO 3 , measure 139ml absolute ethanol, weigh the Co(NO 3 ) 2 ·6H 2 O was added to absolute ethanol to prepare a 0.138mol / L A solution; measure 172ml of deionized water, and weighed C 9 h 21 AlO 3 Add in deionized water, stir magnetically at 80°C until completely dissolved, and prepare solution B with the same concentration; slowly add solution A to suspension B to obtain solution C, adjust the temperature of the water bath to 85°C, and stir for 1 hour at a constant temperature in the open to make Evaporate the alcohol to speed up the hydrolysis rate, then replenish water to the original position; then raise the temperature to 90°C, add 3 times diluted concentrated nitric acid dropwise during t...

Embodiment 2

[0035] A kind of anti-reflection protective layer suitable for solar energy selective absorption Co-WC thermal spray coating is prepared by the following method:

[0036] (1) Preparation of 40wt% Co by sol-gel method 3 o 4 -CoAl 2 o 4 Sol: Weigh 6.909g Co(NO 3 ) 2 ·6H 2 O, 3.918gC 9 h 21 AlO 3 , measure 139ml of absolute ethanol, and weigh the Co(NO 3 ) 2 ·6H 2 O was added to absolute ethanol to prepare a 0.138mol / L A solution; measure 172ml of deionized water, and weighed C 9 h 21 AlO 3 Add in deionized water, stir magnetically at 80°C until completely dissolved, and prepare solution B with the same concentration; slowly add solution A to suspension B to obtain solution C, adjust the temperature of the water bath to 85°C, and stir for 1 hour at a constant temperature in the open to make Evaporate the alcohol to speed up the hydrolysis rate, then replenish water to the original position; then raise the temperature to 90°C, add 3 times diluted concentrated nitric ...

Embodiment 3

[0043] A kind of anti-reflection protective layer suitable for solar energy selective absorption Co-WC thermal spray coating is prepared by the following method:

[0044](1) Preparation of 40wt% Co by sol-gel method 3 o 4 -CoAl 2 o 4 Sol: Weigh 6.909g Co(NO 3 ) 2 ·6H 2 O, 3.918gC 9 h 21 AlO 3 , measure 139ml of absolute ethanol, and weigh the Co(NO 3 ) 2 ·6H 2 O was added to absolute ethanol to prepare a 0.138mol / L A solution; measure 172ml of deionized water, and weighed C 9 h 21 AlO 3 Add in deionized water, stir magnetically at 80°C until completely dissolved, and prepare solution B with the same concentration; slowly add solution A to suspension B to obtain solution C, adjust the temperature of the water bath to 85°C, and stir for 1 hour at a constant temperature in the open to make Evaporate the alcohol to speed up the hydrolysis rate, then replenish water to the original position; then raise the temperature to 90°C, add 3 times diluted concentrated nitric a...

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Abstract

The invention belongs to the field of solar energy selective absorption anti-reflection materials, and particularly relates to a thermal sprayed coating anti-reflection protective layer applicable toselective absorption of medium and high-temperature solar energy and a preparation method of the thermal sprayed coating anti-reflection protective layer. The thermal sprayed coating anti-reflection protective layer consists of an inner layer and an outer layer which are compounded, wherein the inner layer is prepared from 40 weight percent of a high-absorption Co3O4-CoAl2O4 thin film, and the outer layer is prepared from 20 weight percent of low-absorption Co3O4-CoAl2O4. The thermal sprayed coating anti-reflection protective layer prepared by the preparation method disclosed by the inventionnot only has excellent optical selectivity, but also can relieve the stress action of the coating in a thermal treatment process, reduce the porosity of a thermal sprayed coating and increase an absorption-emission ratio of the coating, is relatively high in thermal stability at high temperature, also achieves protection, connection and anti-reflection effects, and is compact in structure and stable in performance.

Description

technical field [0001] The invention belongs to the field of solar energy selective absorption anti-reflection materials, and in particular relates to a thermal spray coating anti-reflection protective layer suitable for medium-high temperature selective absorption of solar energy and a preparation method thereof. Background technique [0002] As one of the most abundant energy sources on earth, solar energy is converted into various forms of energy for utilization. Among them, photothermal conversion technology is widely used in solar collectors. The surface of solar collectors is the key part of absorbing solar energy and converting them into heat energy. High absorptivity absorbs sunlight in different bands; low emissivity ensures low heat radiation loss and better retention of solar radiation. At present, there are many methods for preparing solar selective absorbing coatings at home and abroad, such as magnetron sputtering, which cannot be widely used in large-scale pr...

Claims

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Application Information

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IPC IPC(8): H01L31/0216H01L31/04C23C18/12
CPCC23C18/1216C23C18/1254C23C28/048H01L31/02168H01L31/04Y02E10/50Y02P70/50
Inventor 程旭东张学敏曾鲜
Owner WUHAN UNIV OF TECH
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