Quasi-optical microcavity structure solar spectrum selective absorption coating and preparation method thereof

An optical microcavity and absorbing coating technology, which is applied in coatings, solar thermal power generation, metal material coating technology, etc., can solve the problems of single research, influence of coating optical properties, emissivity increase, etc., and achieve solar absorption rate High, easy to adjust the spectral absorption range, good high temperature stability

Active Publication Date: 2020-09-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As already reported patents CN102954611A, CN102653151A, CN102286720A, CN106167892A, CN103572233A etc. have all studied the selective absorbing coating of double-layer cermet structure, and its shortcoming is: along with the rising of temperature, the diffusion of metal atoms in the coating will The optical properties of the layer are affected, resulting in a decrease in absorptivity and an increase in emissivity
[0010] (1) The research is single, mainly focusing on multilayer film type and cermet type absorbing coating;
[0011] (2) Thermal stability needs to be improved;
[0012] (3) It is difficult to adjust the spectral selectivity

Method used

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  • Quasi-optical microcavity structure solar spectrum selective absorption coating and preparation method thereof
  • Quasi-optical microcavity structure solar spectrum selective absorption coating and preparation method thereof
  • Quasi-optical microcavity structure solar spectrum selective absorption coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1QOM quasi-optical microcavity base selective absorption coating

[0043] A high-temperature stable quasi-optical microcavity structure solar spectrum selective absorption coating, including three parts: from bottom to top, there are metal infrared reflective layer, quasi-optical microcavity absorber, and optical anti-reflection layer, see 1(a) as shown,

[0044] Among them, the quasi-optical microcavity absorber is composed of a cermet 1-metal-cermet 2 structure,

[0045] The metal is metal W, and the cermet is W-SiO 2 Cermet, dielectric Al for optical antireflection layer 2 o 3 and SiO 2 .

[0046] Among them, W infrared reflective layer is about 50-150nm, W-SiO 2 Cermet 1 is about 30-60nm, the middle metal W layer is about 3-15nm, W-SiO 2 Cermet 2 is about 45-65nm, Al 2 o 3 Optical anti-reflection layer 1 is about 10-30nm, SiO 2 The thickness of the optical anti-reflection layer 2 is about 45-70nm. Volume ratio of cermet composition (W:SiO 2 )...

Embodiment 2

[0063] Embodiment 2 performance detection comparison

[0064] Under the condition that only the normal incidence is considered, the calculation formula of the absorption rate can be simplified as:

[0065]

[0066] Among them, λ is the wavelength; I is the standard solar spectrum (AM 1.5); R λ is the emission spectrum of the corresponding wavelength. R λ It can be measured by ultraviolet-visible-near-infrared spectrophotometer and Fourier transform infrared spectrometer. Similarly, under the condition of only normal incidence, the thermal emissivity calculation formula can be simplified to the following formula:

[0067]

[0068] Among them, M λ is the blackbody radiation intensity at the corresponding wavelength.

[0069] The light-to-heat conversion efficiency of the solar spectrum selective absorbing coating is then calculated according to the absorptivity α and thermal emissivity ε. Photothermal conversion efficiency η Thermal Follow the formula below:

[007...

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Abstract

The invention belongs to the technical field of material preparation, and provides a high temperature-stable quasi-optical microcavity-structured solar spectrum selective absorption coating and a preparation method thereof. The coating sequentially comprises three parts, namely a metal infrared reflection layer, a quasi-optical microcavity absorbing body and an optical anti-reflection layer from bottom to top, wherein coating material is metal W, dielectrics are Al2O3 and SiO2, a substrate is stainless steel 304 obtained through mechanical polishing, and thus the coating is easy to prepare andobtain. Compared with a known coating, the coating has the following advantages that (1) the solar absorption rate is high; (2) the high-temperature stability is good; and (3) the spectrum absorptionrange is easy to adjust, and the industrial application is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of material preparation and provides a high-temperature stable quasi-optical microcavity structure solar spectrum selective absorption coating and a preparation method thereof. Background technique [0002] For a long time, energy issues have been particularly important. As one of the alternative energy sources of traditional energy, solar energy has the advantages of cleanness, no pollution, and large reserves. The most common solar energy utilization technologies can be roughly divided into two types: solar thermal and photovoltaic. Among them, photothermal technology has many advantages such as high energy utilization rate, low cost, and simple equipment. Solar thermal conversion technology absorbs solar energy in the form of heat and is widely used in solar water heaters, solar cooling systems and concentrated solar power systems (CSP). The photothermal technology of solar energy is not only another ut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24S70/225F24S70/30C23C14/35C23C14/06
CPCY02E10/40
Inventor 曹峰伍作徐张倩刘一杰魏东
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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