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Solar selective absorbing coating

An absorbing coating and selective technology, which is applied in the field of photothermal solar energy, can solve the problems of lower solar spectrum absorptivity, higher infrared radiation rate, and easy peeling of the film layer, and achieve dense coating, quality improvement, and crack prevention. Effect

Inactive Publication Date: 2016-11-09
NANNING KEYU ENERGY TECH CO LTD
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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 the mutual diffusion between the infrared reflective layer and the absorbing layer in the solar selective absorbing coating in the prior art, resulting in poor thermal stabil

Method used

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  • Solar selective absorbing coating

Examples

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Embodiment 1

[0038] A stainless steel round tube is used as the metal substrate. Firstly, a large-area electron beam evaporation coating process is adopted. Aluminum is used as the coating material, and a reflective base layer with a thickness of 1000nm is coated on the substrate. The preparation of the composite absorbing layer is achieved by reactive sputtering on the above-mentioned reflective base layer by DC magnetron sputtering. The selected target material is metal Cr (purity above 99.7%), and the reaction gas is argon (Cr layer), argon, nitrogen (CrN x layer), argon, nitrogen, oxygen (CrN x o y layer) with a thickness of 30nm, 40nm and 50nm, respectively. where CrN x , CrN x o y layer can also use CrN x The target material is prepared by feeding argon, nitrogen, and argon, oxygen in sequence; finally thermal spraying CuMnO on the composite absorber layer x layer as an anti-reflection layer with a surface roughness of 50 nm.

Embodiment 2

[0040] This embodiment is basically the same as Embodiment 1, except that the thicknesses of the metal sublayer, metal nitride sublayer, and metal oxynitride sublayer are respectively 20nm, 35nm, and 40nm, and the antireflection layer is made of CuMnO x layer, the outer layer is SnO 2 layer composite bilayer composition, CuMnO x The surface roughness of the layer is 80 nm.

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Abstract

The invention relates to the technical field of photothermal solar energy, and discloses a solar selective absorbing coating. The solar selective absorbing coating comprises a reflecting substrate layer, a composite absorbing layer and an antireflection layer which are sequentially arranged on the surface of a substrate from inside to outside. The solar selective absorbing coating is characterized in that the reflecting substrate layer is prepared through a large-area electron beam evaporation coating process, and coating materials used by the coating process are aluminum or copper or silver; the composite absorbing layer comprises a metal sublayer, a metal nitride sublayer and a metal nitric oxide sublayer in sequence from inside to outside, wherein the metal sublayer, the metal nitride sublayer and the metal nitric oxide sublayer are materials having absorbing performance for spectrums; the thermal expansion coefficients of the reflecting substrate layer, the metal sublayer, the metal nitride sublayer and the metal nitric oxide sublayer are sequentially and gradually increased; and the antireflection layer is composed of a single CuMnOx layer or a composite layer with the inner layer being a CuMnOx layer and the outer layer being a SnO2 layer. The prepared coating not only has the superior optical selection performance, but also can relieve the stress effect of the coating in the thermal treatment process, improves the absorptivity-emissivity ratio of the coating and has better thermal stability at a high temperature.

Description

technical field [0001] The invention relates to the technical field of photothermal solar energy, in particular to a solar selective absorption coating. Background technique [0002] The solar selective absorption coating has a high absorption rate α in the sunlight band with a wavelength range of 0.3 μm-2.5 μm, and has a low emissivity ε in the infrared band with a wavelength range of 2.5 μm-50 μm. Therefore, the solar selective absorption coating It is widely used in solar heat collectors or heat collecting tubes, and is the core material 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 reduce heat. For outward radiation, when the infrared reflective l...

Claims

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Application Information

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IPC IPC(8): F24J2/48C23C14/16C23C14/30C23C28/00
CPCY02E10/40C23C14/16C23C14/30C23C28/00C23C28/322C23C28/345C23C28/3455F24S70/25
Inventor 梁洪方
Owner NANNING KEYU ENERGY TECH CO LTD
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