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Solar selectively absorbing coating and preparation method thereof

An absorbing coating and selective technology, applied in the field of solar selective absorbing coating and its preparation, medium and high temperature solar selective absorbing coating and its preparation, can solve the problem of high price, narrow range of refractory metal materials and medium influence. The high temperature selective absorption coating is widely used to achieve the effects of convenient operation, good thermal stability at medium and high temperature, and easy control.

Active Publication Date: 2012-05-30
安徽科鑫光热技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the range of refractory metal materials provided by the prior art is relatively narrow, and many of them are rare metals or precious metals, which are expensive, which affects the wide application of medium and high temperature selective absorption coatings

Method used

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  • Solar selectively absorbing coating and preparation method thereof
  • Solar selectively absorbing coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] Embodiment one A kind of solar energy selective absorbing coating of the present invention, it comprises three layers: the first layer infrared reflection layer (the Cu sheet after this example adopts polishing can adopt this substrate directly as the infrared reflection layer), the second layer absorption layer, the first layer Three anti-reflection layers.

[0020] The first layer is an infrared reflective layer, which is composed of a 70nm thick Cu metal film. It is prepared by direct current sputtering of a metal Cu target with Ar gas as the sputtering gas. If the polished Cu and stainless steel sheet are used as the substrate, this can be used The substrate directly acts as an infrared reflective layer. The infrared reflective layer has high reflection characteristics to the infrared band spectrum and low emissivity.

[0021] The second layer is the absorbing layer, composed of MoSi 2 and Al 2 o 3 The structure is composed of two sub-layers with different thi...

Embodiment 2

[0028] Embodiment two : prepare a kind of solar energy selective absorbing coating, comprise three layers: the first layer infrared reflection layer (this example adopts the stainless steel sheet after polishing and can adopt this substrate directly as infrared reflection layer), the second layer absorption layer, the third layer Anti-reflection layer. The preparation steps are as follows:

[0029] 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 copper sheet and stainless steel sheet is already high, so for the convenience of the preparation process, the substrate was directly used as the infrared reflective layer. The preparation steps are the same as in Example 1.

[0030] The performance of the solar selective absorbing coating prepared in this embodiment is as follows: under the condition of air quality factor AM1.5, the absorptivity of the coating i...

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Abstract

The invention relates to a solar selectively absorbing coating. A three-layer film structure is formed on a substrate from bottom to top, an infrared reflective layer, an absorbing layer and an antireflection layer are arranged on the substrate in turn; the first layer is the infrared reflective layer which is formed from metal copper layer prepared by magnetron sputtering, if a polished stainless steel substrate or a copper substrate is adopted, the substrate can be directly used as the infrared reflective layer; the second layer is the absorbing layer which is an alloy-ceramic composite layer which is formed by dispersing molybdenum disilicide particles in aluminium oxide ceramic medium according to a definite proportion through sputtering, the structure has two sub-layers with different thicknesses and MoSi2 volume percentages so as to form the interference and absorption effect; and the third layer is the Al2O3 antireflection layer which is prepared by magnetron sputtering of Al2O3 ceramic target or DC magnetron reactive sputtering of aluminum target. The coating has good medium-high temperature thermal stability, and when the air quality factor AM is 1.5, the absorption rate is 0.90-0.94, and the emissivity is 0.06-0.14. The solar selectively absorbing coating is suitable for the solar vacuum collector tube with medium-high work temperature (300-500 DEG C).

Description

technical field [0001] The invention provides a solar energy selective absorption coating and a preparation method thereof, in particular to a medium-high temperature solar selective absorption coating and a preparation method thereof. It belongs to the technical field of solar thermal utilization. Background technique [0002] The solar spectrum selective absorption coating has the selective absorption characteristics of high absorption in the visible-near-infrared band of the solar spectrum and high reflection in the mid-to-far infrared band. It is a functional film that directly converts sunlight energy into heat 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 medium and high temperature applications (350°C to 500°C). [0003] At present, the application scope of solar photothermal is mainly low temperature (less than 100...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/48C23C14/34B32B9/04
CPCY02E10/40F24S70/225
Inventor 王聪刘宇薛亚飞
Owner 安徽科鑫光热技术有限公司
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