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Solar selective absorbing coating and preparation method thereof

An absorbing coating and selective technology, applied in the field of solar thermal utilization and thermal power generation, can solve the problems of easy oxidation, diffusion, failure and optical performance degradation of refractory metal particle clusters, and achieve good high temperature thermal stability, The effect of high absorption rate and simple preparation process

Active Publication Date: 2010-12-22
安徽科鑫光热技术有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, in the prior art, a kind of refractory metal particle clusters are generally combined with ceramic media to form a cermet layer. The refractory metal particle clusters are prone to oxidation and diffusion at high temperatures, resulting in long-term service of the absorbing coating at high temperatures. Its optical performance declines, or even fails

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Examples

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Embodiment 1

[0018] Embodiment 1: The present invention provides a solar selective absorption coating, which includes three layers: a first infrared reflection layer, a second absorption layer and a third anti-reflection layer.

[0019] The first layer is an infrared reflection layer, which is composed of a Mo metal film with a thickness of 200nm, and is prepared by direct current sputtering of a metal Mo target with Ar gas as a sputtering gas.

[0020] The second layer is the absorption layer, the composition of which is dispersed in the insulating medium Al by AlNi alloy clusters 2 o 3 The cermet layer in the structure is composed of two sublayers with different thickness and AlNi volume percentage, the thickness of the first sublayer is 50nm, the volume percentage of AlNi is 50%, and the thickness of the second sublayer is 30nm , AlNi volume percentage content is 30%. These two sub-layers have intrinsic absorption for the solar spectrum, and at the same time form an interference absor...

Embodiment 2

[0027] Embodiment two: prepare a kind of solar energy selective absorbing coating, comprise three layers: the first layer infrared reflection layer (this example adopts the copper substrate after polishing, because copper has good infrared reflection characteristic, so can adopt this substrate directly as Infrared reflective layer), the second layer of absorbing layer and the third layer of anti-reflection layer. The preparation steps are as follows:

[0028] Step 1: preparing the first infrared reflection layer. In this experiment, the polished copper sheet was selected as the substrate, because the infrared reflectivity of the copper sheet is already very high. In order to simplify the preparation process, the substrate was directly used as the infrared reflective layer. All the other preparation steps are the same as in Example 1.

[0029] The performance of the solar selective absorbing coating prepared in this embodiment is as follows: under the condition of air quality...

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Abstract

The invention discloses a solar selective absorbing coating and a preparation method thereof. The coating comprises three layers of films from bottom to top on the surface of a heat absorber substrate; the first layer is an infrared reflective layer and consists of a metal molybdenum film; the second layer is an absorption layer, consists of a composite metal ceramic layer made from Ni-Al alloy particles and an insulating medium and is formed by two sublayers with different thicknesses and different Ni-Al alloy volume percentages in structure, wherein the thickness of the first sublayer is 35-70nm, the Ni-Al alloy volume percentage of the first sublayer is 40-60 percent, the thickness of the second sublayer is 30-60nm, and the Ni-Al alloy volume percentage of the second sublayer is 20-40 percent; the third layer is an anti-reflection layer formed by an aluminum oxide ceramic film. The preparation method thereof comprises three steps. Under the condition that an air quality factor AM is 1.5, the absorptivity of the coating is no less than 0.93, and the emissivity of the coating is no more than 0.09. The coating has good heat stability and can be used in the vacuum environment at the temperature of 600 DEG C for a long term. The invention has the practical value and wide application prospect in the technical field of solar heat utilization and thermal generation.

Description

(1) Technical field [0001] The invention relates to a solar selective absorbing coating and a preparation method thereof, which is one of the key technologies of current solar trough thermal power generation. In particular, it relates to a medium-high temperature solar selective absorption coating and a preparation method thereof. The utility model belongs to the technical field of solar thermal utilization and thermal power generation. (2) Background technology [0002] The solar spectrum selective absorption coating has the selective absorption characteristics of high absorption in the solar spectrum: visible-near-infrared band (300nm-2.5um), high reflection in the mid-far infrared band (2.5um-30um), and is a direct conversion of solar energy Functional film for thermal energy. With the continuous development of solar thermal utilization requirements and technologies, the scope of solar thermal applications has developed from low temperature applications (≤100°C) to medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/48B32B15/04B32B18/00B32B9/00C23C14/34C23C14/35C23C14/16C23C14/06
CPCF24J2/4652Y02E10/40F24J2/485F24S70/225F24S70/30
Inventor 王聪薛亚飞刘宇张放放
Owner 安徽科鑫光热技术有限公司
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