High-temperature-resistant and corrosion-resistant solar selective absorption coating

An absorbing coating and corrosion-resistant technology, which is applied in the field of photothermal solar energy, can solve problems such as large interface stress of the coating film, coating cracks, and interdiffusion, and achieve high temperature resistance and atmospheric corrosion resistance. Thermal stability, weather resistance, and performance-enhancing effects

Inactive Publication Date: 2016-10-26
NANNING KEYU ENERGY TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

As the working temperature rises, interlayer interdiffusion of metal components tends to occur, which leads to a significant decrease in the solar spectrum absorptivity of the coating, and a sharp increase in the infrared radiation rate, which affects the service temperature and life of the coating.
[0004] In addition, although the current common anti-reflection layer can increase the transmittance in the visible light region, the protective effect on the coating is not ideal, and there are many restrictions on the selection of materials, making it difficult to obtain satisfactory results; coatings with multi-layer structures During the sintering process, the surface stress of the coating increases, causing cracks to appear in the coating at the later stage of sintering, which affects the final optical selective absorption properties of the coating.
At the same time, due to the large difference in the thermal expansion coefficient of the interlayer materials, the interface stress between the coating layers is relatively large, resulting in the possibility of the film falling off during high and low temperature experiments and use.

Method used

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  • High-temperature-resistant and corrosion-resistant solar selective absorption coating

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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, this embodiment provides a SiO 2 and TiO 2 Atmospheric, high temperature and corrosion resistant solar selective absorption coating, in which the substrate is an aluminum strip, the thin film coating is made of metal aluminum, the reflective base layer is made of aluminum as the coating material, the thickness is 500 nm, and the diffusion barrier layer is TiO 2 film with a thickness of 50 nm and a composite absorber layer of SiO 2 +TiO 2 film with a total thickness of 140nm, in which the first sublayer SiO 2 +TiO 2 The film thickness is 80nm, the second sublayer is SiO 2 +TiO 2 The film thickness is 60nm, SiO in the first sublayer 2 The volume percentage is 40%, the rest is TiO 2 ; second sublayer SiO 2 The volume percentage is 60%, the rest is TiO 2 ; The antireflection layer is a single layer of CuMnO x layer with a surface roughness of 50 nm; the thickness of the organic protective layer is 150 nm.

Embodiment 2

[0037] Such as figure 1 As shown, this embodiment provides a Si 3 N 4 and Ni 3 N 2 Structural atmospheric high temperature and corrosion resistant solar selective absorbing coating. Among them, the substrate is a stainless steel strip, metal aluminum and copper are selected for the film coating, copper is used as the coating material for the reflective base layer, the thickness is 800 nm, and the diffusion barrier layer is Si 3 N 4 film, thickness 60nm, composite absorber Si 3 N 4 + Ni 3 N 2 film, the total thickness is 160nm, the thickness of the first sublayer is 100nm, the thickness of the second sublayer is 60nm, and the Si in the first sublayer 3 N 4 The volume percentage is 40%, the rest is Ni 3 N 2 ;Second sublayer Si 3 N 4 The volume percentage is 60%, the rest is Ni 3 N 2 ; The anti-reflection layer is composed 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; t...

Embodiment 3

[0039] Such as figure 1 As shown, this embodiment provides a TiO 2The high temperature and corrosion resistant selective absorption coating in the atmosphere with NiO structure, in which the substrate is a copper strip, the thin film coating is made of metal copper, the reflective base layer uses copper as the coating material, the thickness is 1000 nm, and the diffusion barrier layer is TiO 2 film with a thickness of 80nm; the composite absorbing layer includes two sublayer structures, both of which are TiO 2 +NiO film, the thickness of the first sublayer and the second sublayer are both 75nm, the TiO in the first sublayer 2 The volume percentage is 60%, and the rest is NiO; in the second sublayer, TiO 2 The volume percentage is 40%; the rest is NiO; the anti-reflection layer consists 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; the thickness of the organic protective layer is 140...

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Abstract

The invention relates to the technical field of photo-thermal solar energy and discloses a high-temperature-resistant and corrosion-resistant solar selective absorption coating. The coating comprises a reflection substrate layer, a composite absorption layer, an antireflection layer and an organic protection layer which are successively arranged on the surface of a substrate from inside to outside and is characterized in that the reflection substrate layer is prepared by a large-area electric beam evaporation coating process; the coating material used by the coating process is aluminum, copper or silver; the composite absorption layer comprises a first sub-layer and a second sub-layer which are successively arranged from bottom to top; the two sub-layers are double-ceramic films; the antireflection layer comprises a single CuMnOx layer or composite double layers; an inner layer of the composite double layers is a CuMnOx layer, and an outer layer of the composite double layers is an SnO2 layer; the thickness of the organic protection layer is 100-200nm; and the organic protection layer is prepared from tetraethyl orthosilicate, absolute ethyl alcohol and ammonia water. Through the high-temperature-resistant and corrosion-resistant solar selective absorption coating, stress action of the coating in the heat treatment process can be relieved; the absorption-emission ratio of the coating is increased; and the high temperature resistance and the corrosion resistance of the absorption coating are greatly improved.

Description

technical field [0001] The invention relates to the technical field of photothermal solar energy, in particular to a high temperature and corrosion resistant solar selective absorption coating. Background technique [0002] The solar spectrum selective absorption coating has a high absorption rate in the sunlight band with a wavelength range of 0.3μm-2.5μm, and has a low emissivity in the infrared band with a wavelength range of 2.5μm-50μm. Therefore, the solar spectrum 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 spectrum selective absorption coating mainly includes an infrared reflection layer, an absorption layer and an anti-reflection layer sequentially arranged on substrates such as glass, aluminum, and stainless steel. Among them, the main function of the infrared reflection layer is to reflect infrared rays and redu...

Claims

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Application Information

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