Method for preparing solar selective absorbing coating with spinel structure

A technology of spinel structure and absorbing coating, which is applied in the field of preparation of spinel structure solar energy selective absorbing coating, can solve the problem of limited temperature resistance, high emissivity of coating, poor optical selectivity of coating, etc. question

Inactive Publication Date: 2015-06-03
QINGDAO SPARKLE ELECTRONICS SCI & TECH
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Problems solved by technology

The coating method is the most convenient, the preparation process is simple, and the cost is low, but the emissivity of the coating is high, and organic adhesives are often added to the coating,...

Method used

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Embodiment Construction

[0006] Weigh manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 9.8g, copper chloride (CuCl 2 2H 2 O) 6.82g, the cation ratio is 1:1, dissolved in 150ml of absolute ethanol, magnetically stirred for 5min until completely dissolved, the solution color is dark blue. The solution was magnetically stirred at constant temperature at 60°C for 6 hours, concentrated to 80ml, and the color of the sol turned dark green. Take 20ml of the prepared sol, dilute it in 100ml of methanol, and stir it magnetically for 5min. Slowly add 19 hydroxypropyl cellulose, and magnetically stir for 4 hours. After the hydroxypropyl cellulose is completely dissolved, let it stand for later use. The pretreated substrate was taken out of the deionized water, dried at 80°C, and then used. Dip the substrate in the sol, and pull the coating film at a pulling speed of 20mm / min. Blast dry at 80°C for 15 minutes, take it out, and pull it repeatedly. The temperature was raised to 500°C at a rate of 1°C per minute, an...

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Abstract

The invention provides a method for preparing a solar selective absorbing coating with a spinel structure. According to the technical scheme, CuCl2, Mn(CH3COO)2 and ethanol are taken as raw materials, hydroxy propyl cellulose is added into the sol, and the film-forming performance of the sol is improved. In the sintering process, the heating rate is controlled to be 1 DEG C per minute, the prepared coating grains are tightly arranged and are average in granularity, and obvious defects on the coating surface are avoided. The coating prepared by pulling twice at a pulling speed of 20mm per minute has the thickness of about 1pm, the absorption rate of 0.88 and the emissivity of 0.05. After the coating is insulated at the temperature of 500 DEG C for 1-30 hours, a small amount of original CuO and Mn2O3 in the coating is converted into Cu1.5Mn1.5O4, the absorption rate and emissivity of the coating are slightly improved, the highest absorption rate is 0.91, the emissivity is 0.09, and the performance is not degenerated. The method disclosed by the invention has the characteristics that the SEM analysis result proves that the grains in the coating do not grow in the thermal insulation process, cracking even stripping are avoided, and the thermal stability is high.

Description

technical field [0001] The invention provides a preparation method of a spinel structure solar selective absorption coating. Background technique [0002] Since the 1990s, many scholars have studied the selective absorption properties of spinel-structured composite oxides, but they all use the coating method. The coating method is the most convenient, the preparation process is simple, and the cost is low, but the emissivity of the coating is high, and organic adhesives are often added to the coating, and the coating is thick, so that the optical selectivity of the coating is not excellent, and the coating is durable. Limited by temperature, it can only be used in medium and low temperature fields. In order to overcome the above problems, the present invention proposes a method for preparing a spinel structure solar selective absorption coating. The spinel structure solar selective absorption coating prepared by this process has low synthesis temperature, easy control of p...

Claims

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Application Information

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IPC IPC(8): C23C26/00F24J2/48
CPCF24S70/225Y02E10/40
Inventor 谭秀航
Owner QINGDAO SPARKLE ELECTRONICS SCI & TECH
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