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A kind of high temperature resistant multi-layer solar energy selective absorption coating and preparation method thereof

An absorption coating and selective technology, which is applied in the field of solar energy utilization, can solve the problems of increasing the manufacturing process and process of heat collector tubes, low productivity and high cost, and achieves the effects of good spectral selective absorption performance, improved life, and high absorption rate.

Active Publication Date: 2017-12-05
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this increases the manufacturing process and procedures of the heat collecting tube, resulting in high cost and low productivity.

Method used

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  • A kind of high temperature resistant multi-layer solar energy selective absorption coating and preparation method thereof
  • A kind of high temperature resistant multi-layer solar energy selective absorption coating and preparation method thereof
  • A kind of high temperature resistant multi-layer solar energy selective absorption coating and preparation method thereof

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Effect test

Embodiment 1

[0025] This embodiment provides a high temperature resistant multilayer solar selective absorbing coating, the absorbing coating is composed of three-layer structure, the top layer is Cr 2 o 3 The anti-reflection layer, the middle layer is a CrAlON absorbing layer with a gradient structure of oxygen content, and the bottom layer is a CrAlSiN infrared reflective layer; wherein, the composition of the absorbing layer CrAlON is as follows: Cr: 35.8 at.%, Al: 16.3 at.%, O: 13.9 at. %, N: 34 at.%; the composition of the infrared reflective layer CrAlSiN is as follows: Cr: 15.2 at.%, Al: 37.8 at.%, Si: 9 at.%, N: 38 at.%.

[0026] The preparation method of the above-mentioned high-temperature resistant multi-layer solar selective absorbing coating comprises the following steps:

[0027] S1. After glow cleaning, control the temperature of the stainless steel substrate at 300°C, close the Ar gas flow valve, and open the N 2 Flow valve, control the air pressure in the coating chamber...

Embodiment 2

[0035] This embodiment provides a high temperature resistant multilayer solar selective absorbing coating, the absorbing coating is composed of three-layer structure, the top layer is Cr 2 o 3 The anti-reflection layer, the middle layer is a CrAlON absorbing layer with a gradient structure of oxygen content, and the bottom layer is a CrAlSiN infrared reflective layer; wherein, the composition of the absorbing layer CrAlON is as follows: Cr: 30.2 at.%, Al: 19.7 at.%, O: 17.7 at. %, N: 32.4 at.%; the composition of the infrared reflective layer CrAlSiN is as follows: Cr: 13.8 at.%, Al: 40 at.%, Si: 6.4 at.%, N: 39.8 at.%.

[0036] The preparation method of the above-mentioned high-temperature resistant multi-layer solar selective absorbing coating comprises the following steps:

[0037] S1. After glow cleaning, control the temperature of the stainless steel substrate at 300°C, close the Ar gas flow valve, and open the N 2 Flow valve, control the air pressure in the coating cha...

Embodiment 3

[0044] This embodiment provides a high temperature resistant multilayer solar selective absorbing coating, the absorbing coating is composed of three-layer structure, the top layer is Cr 2 o 3 The anti-reflection layer, the middle layer is a CrAlON absorbing layer with a gradient structure of oxygen content, and the bottom layer is a CrAlSiN infrared reflective layer; wherein, the composition of the absorbing layer CrAlON is as follows: Cr: 33 at.%, Al: 15 at.%, O: 28 at. %, N: 24 at.%; the composition of the infrared reflective layer CrAlSiN is as follows: Cr: 18.9 at.%, Al: 34.1 at.%, Si: 9.2 at.%, N: 37.8 at.%.

[0045] The preparation method of the above-mentioned high-temperature resistant multi-layer solar selective absorbing coating comprises the following steps:

[0046] S1. After glow cleaning, control the temperature of the stainless steel substrate at 300°C, close the Ar gas flow valve, and open the N 2 Flow valve, control the air pressure in the coating chamber a...

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Abstract

The invention belongs to the technical field of solar energy utilization, and specifically discloses a high-temperature resistant multi-layer solar selective absorption coating and a preparation method thereof. The absorbing coating consists of a three-layer structure, the top layer is a Cr2O3 antireflection layer, the middle layer is a CrAlON absorbing layer with a gradient oxygen content structure, and the bottom layer is a CrAlSiN infrared reflective layer; the composition of the absorbing layer CrAlON is as follows: Cr:30~36 at .%, Al: 14~20 at.%, O: 12~28 at.%, N: 22~38 at.%, the oxygen content gradually increases from the inside to the outside; the composition of the infrared reflective layer CrAlSiN is as follows: Cr: 13~21 at.%, Al: 30~40 at.%, Si: 6~10 at.%, N: 32~40 at.%. The top layer Cr2O3 of the coating system, the middle layer CrAlON coating with gradual oxygen content structure, and the bottom layer CrAlSiN coating all have good high temperature hardness and high temperature oxidation resistance. The coating of the invention has the advantages of high absorptivity, low emissivity, high bonding strength and good high temperature stability, and still has good spectral selective absorption performance up to 550°C.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a high-temperature resistant multi-layer solar selective absorption coating and a preparation method thereof. Background technique [0002] At present, there are mainly two ways of generating electricity using solar energy: photovoltaic and photothermal. Compared with photovoltaic power generation, solar thermal power generation has the advantages of low cost, easy compatibility with thermal power grids, and suitable for large-scale power generation. As early as 1995, the United States, Japan and Germany had begun to conduct comprehensive research on the materials, design, technology and theory of solar thermal power generation. However, compared with foreign countries, the research on solar thermal power generation technology in China lags behind obviously. The high-efficiency solar heat collection device in solar thermal power generation is the cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/08C23C14/34F24J2/48
CPCY02E10/40
Inventor 邹长伟邵乐喜谢伟梁枫唐晓山
Owner LINGNAN NORMAL UNIV
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