Cr series high-temperature solar selective absorbing coating and preparation method thereof

A technology for absorbing coatings and solar energy, applied in the field of solar energy utilization, can solve the problems of low process deposition rate, long production cycle, complex process, etc., and achieve the effects of low price, low emissivity, and simple preparation process
CN102102918AActive Publication Date: 2011-06-22北京天瑞星光热技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京天瑞星光热技术有限公司
Publication Date
2011-06-22

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Abstract

The invention discloses a Cr series high-temperature solar selective absorbing coating and a preparation method thereof. The coating consists of an infrared reflection layer, an absorption layer and an antireflection layer in turn from the bottom to the surface, wherein the first infrared reflection layer consists of three membranes; the middle infrared reflection layer is a Ag membrane of which the upside and downside are plated with a protective film that is any one of a chromic oxide (Cr2O3) film and an aluminum oxide (Al2O3) film respectively; the second absorption layer has two sub-layer structures both of the which are AlCrN+AlCr films, the volume percentage of the first sub-layer AlCr is greater than that of the second sub-layer AlCr; and the third antireflection layer is any one of Cr2O3 film and Al2O3 film. The preparation method comprises the steps of: preparing the infrared emission layer on the substrate surface by adopting a pure metal target magnetron sputtering process; preparing the second absorption layer on the first layer by adopting a Cr target and Al target middle-frequency magnetron sputtering process; and preparing the third antireflection layer on the second layer by adopting a metal target middle-frequency magnetron sputtering process.
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Description

technical field

[0001] The invention relates to the technical field of solar energy utilization, in particular to a Cr-based high-temperature solar selective absorption coating and a preparation method thereof. Background technique

[0002] The solar spectrum selective absorption coating has a high absorption rate in the visible-near-infrared band and a functional film with a low emissivity in the infrared band, which is the key to improving the efficiency of light-to-heat conversion for solar collectors. With the continuous development of solar heat utilization requirements and technology, the application range of solar collector tubes has been developed from low temperature applications (≤100°C) to medium temperature applications (100°C-350°C) and high temperature applications (350°C-500°C). Meet the requirements of medium and high temperature applications such as seawater desalination and solar power generation. The selective absorption coating used for the heat collecti...

Claims

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