Solar Spectrum Selective Absorbing Coating and Its Preparation Method and Application

A technology that absorbs coatings and solar spectrum, applied in coatings, solar thermal devices, solar thermal power generation, etc., can solve the problems of high preparation cost, easy to be oxidized, etc., to achieve improved mechanical properties, not easy to release film, low thermal radiation rate effect

Active Publication Date: 2016-04-27
CHINA BUILDING MATERIALS ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photothermal conversion efficiency of this type of material can be as high as 90%, but it is easily oxidized in the atmosphere, which limits the application of this type of material in flat solar collectors
Doping metals such as Ag, Au, W, Mo or Pt in oxides or nitrides by physical vapor deposition has been found to have strong thermal stability in the atmosphere, and these materials have also been applied to special high temperatures In photothermal conversion devices, however, the relatively high cost of preparation limits the application of such materials in the field of medium and low temperature solar heat collection

Method used

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  • Solar Spectrum Selective Absorbing Coating and Its Preparation Method and Application
  • Solar Spectrum Selective Absorbing Coating and Its Preparation Method and Application
  • Solar Spectrum Selective Absorbing Coating and Its Preparation Method and Application

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Experimental program
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preparation example Construction

[0037] The preparation of the absorbing layer is to prepare the internal absorbing layer on the above-mentioned infrared reflective layer by reactive magnetron sputtering, using metal titanium as the target material, and feeding 50sccm argon and 8sccm nitrogen to make TiN with a thickness of 20nm-50nm x1 o y1 The internal absorption layer of the material; then pass into 2-2.5sccm oxygen, continue to use metal titanium as the target material to prepare the medium absorption layer on the above-mentioned internal absorption layer by the reactive magnetron sputtering method, and the thickness of the medium absorption layer is controlled at 10 -50nm, the material of the middle absorbing layer is TiN x2 o y2 Then increase the flow rate of oxygen to 2.5-3.5sccm, continue to use metal titanium as the target material to prepare an outer absorbing layer on the above-mentioned middle absorbing layer by reactive magnetron sputtering, the thickness of the outer absorbing layer is controll...

example 1

[0043] Carry out following operation steps according to above-mentioned preparation method:

[0044] 1) Carry out radio frequency ion cleaning to the glass base layer, remove the surface contamination layer and oxide layer, and increase the surface activity of the base;

[0045] 2) Transfer the base layer to the front of the aluminum target until the background vacuum is better than 6×10 -6 After Torr, pass into 50sccm argon gas, control pressure is 5mTorr, open sputtering power supply, keep power 1200W, set transfer rate as 0.4m / min, make base layer pass aluminum target 12 times, in order to prepare infrared reflective aluminum layer;

[0046] 3) Transfer the base layer coated with a metal aluminum layer to the front of the titanium target, inject 50 sccm argon gas, 8 sccm nitrogen gas, control the air pressure 5mTorr, turn on the sputtering power supply, keep the power at 1000W, and the transfer rate is 0.4m / min, so that the base layer Through the titanium target 3 times to...

Embodiment 2

[0054] Carry out following operation steps according to above-mentioned preparation method:

[0055] 1) Carry out radio frequency ion cleaning on the Al base layer to remove the surface contamination layer and oxide layer, and increase the surface activity of the base. The thermal emissivity of the Al plate after sputtering cleaning is lower than 1.7%. At this time, the Al base layer has an infrared reflective layer at the same time role;

[0056] 2) The base layer is transported to the front of the magnetron sputtering titanium target, and the background vacuum is better than 6×10 -6 After Torr, feed 50sccm argon, 8sccm nitrogen, control the air pressure at 5mTorr, turn on the sputtering power supply, keep the power at 1000W, and the transmission rate at 0.4m / min, so that the base layer passes through the titanium target 3 times to prepare TiN. 0.94 o 0.60 internal absorption layer;

[0057] 3) Under the condition that other parameters remain unchanged, 2sccm of oxygen is ...

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Abstract

The invention discloses a solar spectrum selective absorbing coating, a preparation method and an application thereof. The solar spectrum selective absorbing coating comprises a substrate layer, an infrared reflecting layer, an absorbing layer and an anti-reflection layer; the absorbing layer is composed of three gradient solar spectrum absorbing layers (an outer absorbing layer, a middle absorbing layer and an inner absorbing layer), the inner absorbing layer is made of TiN(x1)O(y1), the middle absorbing layer is made of TiN(x2)O(y2), and the outer absorbing layer is made of TiN(x3)O(y3). The optical parameter of the absorbing layer is gradually changed, so that the coating can effectively absorb the solar spectrum, the heat stability is high, and the thermal radiation rate is low.

Description

technical field [0001] The invention relates to a solar light-to-heat conversion material used at medium and low temperatures and a preparation method thereof, in particular to a solar spectrum selective absorption coating and a preparation method thereof which can be used in vacuum tube and flat solar water heaters. Background technique [0002] Solar thermal utilization is one of the most direct and effective ways to develop new energy and renewable energy. Among them, solar collectors used at medium and low temperatures (80-400°C) have the advantages of easy promotion and high penetration rate, and have become an energy-saving important means of platooning. The heat absorber is the core component of the solar heat collector. The early heat absorbers used black paint, electroplated black chrome or black nickel as the absorbing material, although these materials have a high absorption rate in the sunlight band, which can effectively convert solar energy into At the same ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/48B32B9/04B32B15/20B32B17/06C23C14/35C23C14/06C23C14/08
CPCY02E10/40
Inventor 宋斌斌刘静汪洪
Owner CHINA BUILDING MATERIALS ACAD
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