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A kind of nanocomposite cr-al-o solar spectrum selective absorption coating and its preparation method

A solar spectrum and selective absorption technology, applied in the field of nanocomposite Cr-Al-O solar spectrum selective absorption coating and its preparation, can solve the problem of less research on the optical properties and microstructure of the coating, high ion energy and low cost and other problems, to achieve the effect of good industrial application prospects, simple equipment structure, and overcoming poor adhesion.

Inactive Publication Date: 2015-11-11
WUHAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] Arc ion plating technology is also a physical vapor deposition technology. Due to its characteristics of no pollution, high ionization rate, fast deposition rate, large ion energy, and low cost, it is currently the main preparation technology for hard coatings, and its application There are still very few studies on the preparation of solar spectrum selective absorption coatings, and even less research on the optical properties and microstructure of the prepared coatings.

Method used

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  • A kind of nanocomposite cr-al-o solar spectrum selective absorption coating and its preparation method
  • A kind of nanocomposite cr-al-o solar spectrum selective absorption coating and its preparation method
  • A kind of nanocomposite cr-al-o solar spectrum selective absorption coating and its preparation method

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preparation example Construction

[0038] The preparation process of this embodiment is:

[0039] First, the cleaning of the base material. The base material was ultrasonically cleaned in acetone, alcohol, and deionized water for 15 minutes, then dried in a desiccator, and then loaded on a workpiece rack whose rotation speed could be adjusted between 3-5 rpm, and the sample preparation chamber door was closed.

[0040] Second, the acquisition of a vacuum environment. The first is to use a mechanical pump for pumping under low vacuum conditions; when the vacuum reaches below 2pa, turn on the molecular pump to convert the pumping system to a high vacuum acquisition system until 8×10 -3 Below pa.

[0041] Third, the preparation of the coating. First, set the rotation speed of the workpiece holder to 3-5 rpm. Then, high-power (1.4-1.6 kilowatts) arc discharge technology is used to evaporate Cr ions from the Cr target with electric current, and deposit them on a rotating substrate connected to a negative bias of -800 to...

Embodiment 1

[0043] Example 1: At 10 -3 Under the vacuum degree, control the speed to 3rpm, use the high-energy ions evaporated from the Cr target to deposit the Cr layer on the cleaned stainless steel substrate. The power of the deposition source is 1.4 kilowatts, the bias voltage on the workpiece is -800V, and the deposition time is 10min. The thickness of the infrared high reflection layer is 500 nanometers; after the deposition, the bias voltage is reduced to -100V, oxygen gas with a flow rate of 15SCCM is introduced, and the argon flow rate is adjusted to make the vacuum degree 0.4Pa, and the CrAl target is turned on, the current is 30A, The corresponding power is 0.6 kilowatts. The low-oxygen absorption layer is deposited. The low-oxygen absorption layer is composed of Cr-Al alloy nanocrystalline and amorphous phase (Al 2 Cr)-O X The deposition time of the composite material is 2min, where X is 0.67, the thickness is 65 nanometers, and the size of the metal nanocrystal is 4-5 nanometers...

Embodiment 2

[0044] Example 2: At 10 -2 Under the vacuum degree, control the rotation speed to 5rpm, use the high-energy ions evaporated from the Cr target to deposit the Cr layer on the cleaned stainless steel substrate. The power of the deposition source is 1.6 kW, the bias voltage on the workpiece is -1000V, and the deposition time is 10min. The thickness of the infrared high reflection layer is 600 nanometers; after the deposition is completed, the bias voltage is reduced to -200V, oxygen gas with a flow rate of 20SCCM is introduced, and the argon flow rate is adjusted to make the vacuum degree 0.5Pa. The CrAl target is turned on and the current is 40A. The corresponding power is 0.8 kilowatts, and the low oxygen absorption layer is deposited. The low oxygen absorption layer is composed of Cr-Al alloy nanocrystalline and amorphous phase (Al 2 Cr)-O X The deposition time of the composite material is 2min, where X is 0.7, the thickness is 70 nanometers, and the size of the metal nanocrystal...

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Abstract

The invention discloses a nano composite Cr-Al-O (chromium-aluminum-oxygen) solar spectrum selective absorption coating and a preparation method thereof. The absorption coating is characterized in that an infrared high reflection layer, a low oxygen absorption layer, a medium oxygen absorption layer and a high oxygen antireflection layer are sequentially deposited on a stainless steel substrate. According to the preparation method of the coating, an electric arc discharging method is adopted to sequentially deposit the infrared high reflection layer, the low oxygen absorption layer, the medium oxygen absorption layer and the high oxygen antireflection layer on the substrate. The coating is reasonable in structure design. The prepared Cr-Al-O composite coating has an absorption ratio of 0.92 to 0.94, a transmitting rate of 0.15 to 0.22, good heat stability and high adhesive force. Meanwhile, the preparation process is free from pollution, the severe environmental pollution problem of the conventional electroplating method is overcome, the problems of the magnetron sputtering method, such as poor heat stability and the high-temperature adhesive force of coating and the problem of the evaporation technology that uniformity of the coating is poor can be solved, and the nano composite Cr-Al-O solar spectrum selective absorption coating is expected to be applied to the medium-high-temperature solar utilization field.

Description

technical field [0001] The invention relates to the field of thin film materials, in particular to a nanocomposite Cr-Al-O solar spectrum selective absorption coating and a preparation method thereof. Background technique [0002] In the solar photothermal conversion device, the solar radiation must first be converted into heat energy, and the component that can realize this function is the solar collector. Part of the core of the part is the solar spectrum selective absorbing coating. This coating absorbs most of the light waves in the ultraviolet to near-infrared range of the solar spectrum, and is transparent in the infrared band. Depositing the coating on a metal substrate can use its high infrared reflection characteristics to reflect infrared waves away. The purpose of this design is to avoid as much as possible the high heat emissivity caused by the coating absorbing infrared light waves, resulting in heat energy loss, especially as the working temperature of the coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/08C23C14/54F24J2/48B32B15/04
CPCY02E10/40F24S70/225
Inventor 刘辉东杨兵万强王如意
Owner WUHAN UNIV
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