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Solar selective absorbing coating and preparation method thereof

An absorbing coating and selective technology, applied in solar thermal power generation, coatings, solar thermal devices, etc., can solve problems such as poor thermal stability, increased infrared emissivity, and reduced solar spectral absorption rate, and achieve improved thermal stability. performance effect

Active Publication Date: 2015-11-25
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to aim at mutual diffusion between the infrared reflective layer and the absorbing layer in the solar selective absorbing coating in the prior art, and the infrared reflective layer in the solar selective absorbing coating containing a diffusion barrier layer, The interdiffusion between the diffusion barrier layer and the absorbing layer leads to poor thermal stability, a significant decrease in the solar spectrum absorptivity, and a sharp increase in the infrared radiation rate. A solar selective absorbing coating with good thermal stability is proposed and its preparation method

Method used

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

Examples

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Embodiment 1

[0035] This embodiment provides a solar selective absorbing coating, its structure is as follows figure 1 As shown, a substrate, an infrared reflection layer, a transition layer, a composite absorption layer and an anti-reflection layer are sequentially arranged from the bottom layer to the surface.

[0036] Wherein, the substrate is an aluminum substrate with a thickness of 0.5mm.

[0037] The infrared reflective layer is an Al layer with a thickness of 200nm, and the electrical conductivity of the infrared reflective layer is greater than 10 6 S m -1 .

[0038] The transition layer is CrN x , wherein, 1

[0039] The composite absorption layer includes a metal sublayer Cr layer, a metal nitride sublayer CrN from bottom to top m1 layer and metal oxynitride sublayer CrN m2 o n , where 1≤m 1 ≤1.2, 02 ≤0.5, 1m1 layer and CrN m2 o n Both the refractive index and extinction coefficient decrease sequentially. The total thickness of the compo...

Embodiment 2

[0057] This embodiment provides a solar selective absorption coating, in which a substrate, an infrared reflection layer, a transition layer, a composite absorption layer and an anti-reflection layer are sequentially arranged from the bottom layer to the surface.

[0058] Wherein, the substrate is a glass sheet with a thickness of 6 mm.

[0059] The infrared reflective layer is a Cu layer with a thickness of 80nm.

[0060] The transition layer is completely oxynitrided yCrN·(1-y)Cr 2 o 3 , wherein, 0

[0061] The composite absorption layer includes a metal sublayer Cr layer, a metal nitride sublayer CrN from bottom to top m1 layer and metal oxynitride sublayer CrN m2 o n , where, 1.21 2 m1 layer and CrN m2 o n The refractive index and extinction coefficient of each are all successively decreased; the total thickness of the composite absorption layer is 65nm, the thickness of the Cr layer is 10nm, and the CrN m1 layer thickness is 25nm, the ...

Embodiment 3

[0079] This embodiment provides a solar selective absorption coating, in which a substrate, an infrared reflection layer, a transition layer, a composite absorption layer and an anti-reflection layer are sequentially arranged from the bottom layer to the surface.

[0080] Wherein, the substrate is a copper sheet with a thickness of 0.3 mm.

[0081] The infrared reflective layer is an Au layer with a thickness of 100 nm.

[0082] The transition layer is fully oxynitrided ySi 3 N 4 ·(1-y)SiO2 2 , wherein, 0

[0083] The composite absorption layer includes a metal sublayer Cr layer, a metal nitride sublayer CrN from bottom to top m1 layer and metal oxynitride sublayer CrN m2 o n , where, 1.11 2 m1 layer and CrN m2 o n Refractive index and extinction coefficient of all are to reduce successively; The total thickness of described composite absorption layer is 100nm, and the thickness of described Cr layer is 20nm, and described CrN m1 layer thi...

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Abstract

The invention provides a solar selective absorbing coating. The solar selective absorbing coating is sequentially provided with a substrate, an infrared reflection layer, a transition layer, a composite absorbing layer and an antireflection layer from the bottom layer to the surface. Besides, the transition layer is arranged to be made of one or more of CrNx, yCrN*(1-y)Cr2O3, ySi3N4*(1-y)SiO2, yAlN*(1-y)Al2O3 and yTi3N4*(1-y)TiO2, wherein x is larger than 1 and smaller than 1.5, and y is larger than 0 and smaller than 1. Thus, the coating can effectively prevent mutual diffusion between the infrared reflection layer and the absorbing layer, and mutual diffusion among the infrared reflection layer, a diffusion impervious layer and the absorbing layer in the solar selective absorbing coating comprising the diffusion impervious layer The thermal stability of the solar selective absorbing coating is improved, so that the solar selective absorbing coating still has high solar spectral absorptivity and low infrared radiance under the atmospheric condition of 400 DEG C. The solar selective absorbing coating has the good thermal stability and excellent spectral selectivity.

Description

technical field [0001] The invention relates to a solar selective absorption coating and a preparation method thereof, belonging to the technical field of solar spectrum selective absorption coatings. Background technique [0002] The solar spectrum selective absorption coating has a high absorption rate α in the solar light band with a wavelength range of 0.3 μm-2.5 μm, and a low emissivity ε in the infrared band with a wavelength range of 2.5 μm-50 μm. Therefore, the solar spectrum selective absorption Coatings are widely used in solar heat collectors or heat collecting tubes, and are the core materials for realizing solar light-to-heat conversion. At present, the existing solar selective absorbing coatings mainly include an infrared reflective layer, an absorbing layer, and an anti-reflection layer sequentially arranged on glass, aluminum, stainless steel and other substrates. Among them, the main function of the infrared reflective layer is to reflect infrared rays and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/48C23C14/35C23C14/08C23C14/06C23C14/14B32B15/04B32B33/00
CPCY02E10/40
Inventor 杨中周刘静孙志强汪洪
Owner CHINA BUILDING MATERIALS ACAD
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