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Solar selective absorbing coating and preparation method therefor

An absorbing coating and selective technology, which is applied in solar thermal power generation, coatings, solar thermal devices, etc., can solve problems such as the need to increase the working temperature, the deterioration of coating performance, and the increase in emissivity, so as to improve the absorption and heat dissipation. Effects of stability, reduced interfacial stress, and low material cost

Active Publication Date: 2017-01-04
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, metal nitride (oxide) oxide is one of the most commonly used spectrally selective absorption coatings, but the spectrally selective absorption coating based on metal nitride (oxide) absorption is mainly used in the low temperature field, because, based on metal nitrogen Spectrum selective absorption coatings absorbed by (oxide) oxides will deteriorate with the increase of operating temperature. The radiation rate increases and the absorption rate decreases; 2) metal nitrogen (oxygen) oxides are oxidized under high temperature conditions in the atmospheric environment, and the absorption rate decreases
[0004] Therefore, the operating temperature of spectrally selective absorbing coatings based on metal nitride (oxide) absorption needs to be improved

Method used

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  • Solar selective absorbing coating and preparation method therefor
  • Solar selective absorbing coating and preparation method therefor
  • Solar selective absorbing coating and preparation method therefor

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Embodiment 1

[0035] This embodiment provides a solar selective absorbing coating, the coating includes a substrate, an infrared reflection layer, an absorbing layer and an anti-reflection layer from the bottom layer to the surface in sequence, and the absorbing layer is composed of a first sublayer, a second The second sublayer and the third sublayer are composed of the first sublayer and the second sublayer containing metal nitride, the third sublayer is metal oxynitride, and the first sublayer of the absorption layer is metal nitride , The refractive index and extinction coefficient of the metal nitride of the second sublayer and the metal oxynitride of the third sublayer all decrease successively, the first sublayer is in contact with the infrared reflection layer, and the third sublayer is in contact with the antireflection layer . The first sublayer is incompletely nitrided metal nitride, the second sublayer is metal nitride, and the third sublayer is metal nitride oxide. The incompl...

Embodiment 2

[0038] This embodiment provides a solar selective absorbing coating, its structure is as follows figure 1 As shown, wherein, 1 is the substrate, 2 is the infrared reflection layer, 3 is the absorption layer, 31 is the first sublayer, 32 is the second sublayer, 33 is the third sublayer, and 4 is the antireflection layer.

[0039] Wherein, the substrate is an aluminum substrate with a thickness of 0.5 mm.

[0040] The infrared reflective layer is an Al layer with a thickness of 200nm.

[0041] The absorption layer includes a first sublayer, a second sublayer and a third sublayer from bottom to top, and the first sublayer is CrN x , wherein, 0y , wherein, 1≤y≤1.5, said y is the atomic number ratio of N element to Cr element; said third sublayer is CrN m o n , wherein, 0<m≤1.5, 0<n≤2, the m is the atomic number ratio of the N element to the Cr element, and the n is the atomic number ratio of the O element to the Cr element. The total thickness of the absorption layer is 125nm,...

Embodiment 3

[0059] This embodiment provides a solar selective absorbing coating, its structure is as follows figure 1 As shown, wherein, 1 is the substrate, 2 is the infrared reflection layer, 3 is the absorption layer, 31 is the first sublayer 1, 32 is the second sublayer, 33 is the third sublayer, and 4 is the antireflection layer. Wherein, the substrate is a glass sheet with a thickness of 6 mm. The infrared reflective layer is an Al layer with a thickness of 100 nm.

[0060] The absorption layer includes a first sublayer, a second sublayer and a third sublayer from bottom to top, and the first sublayer is CrN x , wherein, 0y , wherein, 1≤y≤1.5, said y is the atomic number ratio of N element to Cr element; said third sublayer is CrN m o n , wherein, 0<m≤1.5, 0<n≤2, the m is the atomic number ratio of the N element to the Cr element, and the n is the atomic number ratio of the O element to the Cr element. The total thickness of the absorption layer is 120nm, wherein the thickness of...

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Abstract

The invention relates to a solar selective absorbing coating and a preparation method therefor. The coating successively comprises a substrate, an infrared reflective layer, an absorbing layer and an antireflection layer from a bottom layer to the surface, wherein the absorbing layer is composed of a first sub layer, a second sub layer and a third sub layer; the firsts sub layer and the second sub layer contain metal nitrides, the third sub layer is a metal oxynitride, the first sub layer is in contact with the infrared reflective layer, and the third sub layer is in contact with the antireflection layer. The preparation method comprises the following steps: depositing the infrared reflective layer on the substrate; depositing the absorbing layer on the infrared reflective layer; and depositing the antireflection layer on the absorbing layer. According to the metal nitride (oxynitride) solar selective absorbing coating provided by the invention, the working temperature of the metal nitride (oxynitride) solar selective absorbing coating is raised, and the coating is simple to prepare and is more suitable for scaled production.

Description

technical field [0001] The invention relates to a coating, in particular to a solar selective absorption coating and a preparation method thereof. Background technique [0002] The solar spectrum selective absorption coating is the core material for photothermal conversion of solar collectors. It has a high absorption rate in the sunlight band with a wavelength range of 0.3μm-2.5μm, and has a high absorption rate in the infrared heat radiation band with a wavelength range of 2.5μm-50μm. With low emissivity, it can achieve high absorption and low radiation heat dissipation, and convert solar energy into heat energy to the maximum extent. Selective absorbing coatings can be divided into low-temperature coatings (below 100°C), medium-temperature coatings (100-400°C) and high-temperature coatings (above 400°C) according to different operating temperatures. Among them, low-temperature coatings are mainly used for solar water heaters, medium-temperature coatings are mainly used f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/48C23C14/35C23C14/06C23C14/16C23C14/18C23C14/08C23C14/10
CPCC23C14/0641C23C14/0652C23C14/0676C23C14/08C23C14/10C23C14/165C23C14/185C23C14/3485C23C14/35C03C17/36C03C17/3626C03C17/3649C03C17/366C03C2217/734C23C14/0036F24S70/225F24S70/25Y02E10/40
Inventor 杨中周刘静孙志强汪洪
Owner CHINA BUILDING MATERIALS ACAD
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