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Quasi-optical micro-cavity-based selective absorbing coating capable of being used at 800 DEG C or above

An optical microcavity and absorption coating technology, applied in coating, metal material coating process, vacuum evaporation coating, etc., can solve the problems of difficult high absorption ratio and high temperature thermal stability, and achieve the effect of high spectral selectivity

Active Publication Date: 2021-11-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, cermet-type selective absorbing coatings and multilayer interference-type absorbing coatings are widely studied, because the diffusion behavior of metal atoms at high temperatures will cause high-temperature optical degradation of selective absorbing coatings, so the current optical structure design has not It can make full use of the excellent thermal stability of ultra-high temperature ceramic materials, and it is difficult to design absorbing coatings to achieve high absorption ratio and high temperature thermal stability at the same time

Method used

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  • Quasi-optical micro-cavity-based selective absorbing coating capable of being used at 800 DEG C or above
  • Quasi-optical micro-cavity-based selective absorbing coating capable of being used at 800 DEG C or above
  • Quasi-optical micro-cavity-based selective absorbing coating capable of being used at 800 DEG C or above

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The above-mentioned preparation method is used to use ZrB in the quasi-optical microcavity structure prepared by radio frequency power sputtering under the argon environment of 0.4Pa at room temperature. 2 The material is used as the main absorbing layer of the selective absorbing coating, and the structure schematic diagram of the obtained selective absorbing coating is shown as figure 1 The specific coating parameters are shown in Table 1 below.

[0066] Table 1

[0067]

[0068] The simulated reflectance spectrum of this selective absorbing coating ZAA is as figure 2 shown. And using magnetron sputtering deposition on the Si substrate to obtain a volume ratio of 1:3 composite ceramic layer ZrB 2 -Al 2 o 3 , the volume ratio is 1:2.5 composite ceramic layer ZrB 2 -Al 2 o 3 , the volume ratio is 1:2 composite ceramic layer ZrB 2 -Al 2 o 3 , the sample numbers are Z1, Z2 and Z3 respectively, and the refractive index and extinction coefficient are tested o...

Embodiment 2

[0073] On the basis of Example 1, the ZrC material is used as the main absorbing layer of the selective absorbing coating in the quasi-optical microcavity structure prepared by radio frequency power sputtering at room temperature in an argon environment of 0.4 Pa. The selective absorbing coating of this embodiment The specific coating parameters of the layers are shown in Table 2 below.

[0074] Table 2

[0075]

[0076] The reflection spectra of the selective absorbing coating of this embodiment before and after high temperature vacuum annealing at 800°C and 900°C for 100 hours are as follows: Figure 12 As shown, the solar absorptivity and thermal emissivity under different heat treatment conditions are as Figure 13 As shown, the light-to-heat conversion efficiency diagram at different focusing magnifications is shown in Figure 14 As shown, the total efficiency of photoelectric conversion under different focusing magnifications is as follows Figure 15 shown. The ab...

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Abstract

The invention provides a quasi-optical micro-cavity-based selective absorbing coating capable of being used at 800 DEG C or above. The quasi-optical micro-cavity-based selective absorbing coating sequentially comprises an infrared reflecting layer, a quasi-optical micro-cavity absorber and an optical anti-reflection layer from bottom to top, wherein the optical anti-reflection layer comprises at least one of an Al2O3 anti-reflection layer and a SiO2 anti-reflection layer; the quasi-optical micro-cavity absorber sequentially comprises a first quasi-optical micro-cavity selective absorption layer, an ultra-high temperature ceramic material layer and a second quasi-optical micro-cavity selective absorption layer from bottom to top; the first quasi-optical micro-cavity selective absorption layer and the second quasi-optical micro-cavity selective absorption layer are made of an ultra-high temperature ceramic material Al2O3 or SiO2 composite material; the infrared reflecting layer is made of an ultra-high temperature ceramic material; and the ultra-high temperature ceramic material is at least one of carbide, nitride and boride. According to the technical scheme, high spectral selectivity is achieved; and the high-temperature thermal stability is realized.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a quasi-optical microcavity-based selective absorption coating that can be used at temperatures above 800°C. Background technique [0002] Photothermal conversion is the most direct and economical way to utilize solar energy. Its core component is a selective absorption coating. Improving the spectral selectivity and thermal stability of the selective absorption coating can effectively improve the performance of concentrated solar power generation systems (CSP). Solar energy conversion efficiency. However, it is still a huge challenge to develop absorbers with high thermal stability under extreme high temperature conditions. Ultra-high temperature ceramics (UHTCs) possess ultrahigh melting points, electrical and thermal conductivity, long-term chemical durability, and intrinsic spectral selectivity. [0003] At present, selective absorbing coatings in l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/08C23C14/10C23C14/35F24S70/225
CPCC23C14/081C23C14/10C23C14/0641C23C14/067C23C14/0635C23C14/06C23C14/35F24S70/225Y02E10/40
Inventor 曹峰王建张倩伍作徐刘一杰
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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