CN102721217A - Groove type solar high-temperature selective absorption coating - Google Patents
Groove type solar high-temperature selective absorption coating Download PDFInfo
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- CN102721217A CN102721217A CN2012102203196A CN201210220319A CN102721217A CN 102721217 A CN102721217 A CN 102721217A CN 2012102203196 A CN2012102203196 A CN 2012102203196A CN 201210220319 A CN201210220319 A CN 201210220319A CN 102721217 A CN102721217 A CN 102721217A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
The invention relates to a groove type solar high-temperature selective absorption coating, which sequentially comprises an infrared reflecting layer, a first absorption layer, a second absorption layer and an antireflection layer from the base to the surface. The raw materials of the coating are all conventional materials, the groove type solar high-temperature selective absorption coating is wide in application range, high in molding performance and low in price and can be processed into columnar targets, the target utilization rate is obviously improved, and the operating cost can be reduced further; and moreover, the groove type solar high-temperature selective absorption coating is suitable for solar thermal collector tubes with high/medium operating temperature.
Description
Technical field
The present invention relates to groove type solar elevated temperature heat power field, be specifically related to solar selectively absorbing coating in a kind of high-temperature heat-collection pipe.
Background technology
Solar energy thermal-power-generating is an important technology approach that large-scale develops and utilizes solar energy; Tower, slot type, dish formula system are arranged at present; Wherein more with slot type and tower system commercial application; Particularly trough type solar power generation is unique in the world up to now mature technology through commercialized running in 20 years, and its cost is far below photovoltaic generation.The energy-storage system of slot light collection heat generating system can be realized operation in 24 hours, and along with the increase of scale, cost of electricity-generating also has very strong competitiveness.At present, development priority is middle high-temperature heat-gathering, and operating temperature surpasses 400 ℃ thermal-collecting tube, can be used for the heat generating.In the middle high-temperature heat-collection pipe, generally adopt the high power concentrator technology, the optically focused ratio can be up to 80.The photo-thermal transformation efficiency is a key index, and often the raising of one percentage point all is a strain after.
For solar selectively absorbing coating at present after deliberation with film systems such as the SS-C/SS (stainless steel) that has been widely used black chromium, anode oxidation coloration Ni-Al2O3 and has had a composition gradual change characteristic and Al-N/Al, but these coatings are applicable to that 200 ℃ of thermal-collecting tubes with interior plate type heat collecting device are surperficial.But under hot conditions, obviously raise because its infrared emittance rises with temperature, cause the heat collector heat loss obviously to rise, the thermal efficiency significantly descends.For the middle high temperature utilization of solar energy, especially high temperature utilization needs a kind of absorptivity height, low, the Heat stability is good of emissivity, and the easy coating for selective absorption of technology.
Summary of the invention
In order to solve the above-mentioned technical problem that exists in the prior art; The object of the present invention is to provide a kind of groove type solar high temperature to select absorber coatings; When thermal-collecting tube was worked under 400-500 ℃ of temperature environment, coating was high to the absorptivity of solar spectrum, low, the good thermal stability of emissivity of high temperature black body radiation.
In order to solve the problems of the technologies described above, the present invention realizes through following technical scheme:
A kind of groove type solar high temperature is selected absorber coatings, from the matrix to the surface, is followed successively by infrared reflecting layer, first absorbed layer, second absorbed layer and antireflection layer; Said infrared reflecting layer is made up of the Mo film, and thickness is 20-120nm; First absorbed layer is the Mo+ZnO film, and thickness is 50-75nm, and wherein the content of ZnO is 20-40wt%; Second absorbed layer is the Mo+ZnO film, and thickness is 75-125nm, and wherein the content of ZnO is 40-50wt%; Said antireflection layer is a ZnO film, and thickness is 25-75nm.
Wherein, the thickness of said infrared reflecting layer is 30-90 nm.
Wherein, the thickness of said first absorbed layer is 50-70 nm.
Wherein, the thickness of said second absorbed layer is 100-125 nm.
Wherein, the thickness of said first absorbed layer and second absorbed layer and be said antireflection layer 2-3 doubly.
Compared with prior art, the present invention has the following advantages: coating for selective absorption provided by the present invention mixes two absorbed layer and alloy antireflection layers of interfering of forming by infrared metallic reflection Mo layer, Mo and ZnO and forms.Has the good high-temperature stability.Simultaneously,, utilize the interference effect of film and the sink effect that optical trap comes enhancement coating, make rete have the high absorptivity of solar spectrum, the advantage of infrared spectrum low-launch-rate owing to adopted two interference absorbent layer structures.In addition, the raw material that coating of the present invention is selected are conventional material, and range of application is wider, and processability is good, can be processed into the column target, significantly improves target utilization, and price is also cheaper simultaneously, can further reduce job costs.The solar energy heat collection pipe of hot operation temperature in being applicable to.
The specific embodiment
Below in conjunction with the specific embodiment the present invention is done further detailed explanation.
Groove type solar high temperature of the present invention selects absorber coatings to comprise four tunics, from the matrix to the surface, is followed successively by infrared reflecting layer, first absorbed layer, second absorbed layer and antireflection layer, and said infrared reflecting layer is made up of the Mo film, and thickness is 20-120nm; First absorbed layer is the Mo+ZnO film, and thickness is 50-75nm, and wherein the content of ZnO is 20-40wt%; Second absorbed layer is the Mo+ZnO film, and thickness is 75-125nm, and wherein the content of ZnO is 40-50wt%; Said antireflection layer is a ZnO film, and thickness is 25-75nm.
Groove type solar high temperature of the present invention is selected absorber coatings, and can adopt following method preparation: it may further comprise the steps:
Preliminary treatment is carried out in substrate
Earlier to carrying out preliminary treatment in the stainless steel-based end; With the polishing of stainless steel-based basal surface, ultrasonic waves for cleaning 10-20 min in alcohol respectively then, and then with deionized water ultrasonic waves for cleaning 5-10 min; Then dry processing, magnetron sputtering is carried out at the stainless steel-based end after will drying then; Earlier vacuum chamber is evacuated to 10
-The 3 Pa orders of magnitude charge into Ar gas as sputtering atmosphere, and the adjustment sputtering pressure cleans 20-30min with ion gun to substrate to 1-3 Pa.
Deposition ground floor infrared reflecting layer on matrix
Select the Mo target of purity 99.99% for use, after having cleaned substrate, opening M o target power supply.Adopt magnetically controlled DC sputtering, adjustment dc source voltage is 350-450 V; The preparation coating layer thickness is 20-120nm, and this layer has high reflection characteristic to infrared band spectrum.
On infrared reflecting layer, deposit absorbed layer
Selecting purity for use is 99.99% ZnO target and above-mentioned Mo target, adopts the cosputtering mode to form first absorbed layer, and THICKNESS CONTROL is 50-75nm; Increase the power of sputter ZnO target film, prepare the second subgrade Mo-SiO2 film, thickness is 75-125nm.
On second layer absorbed layer, deposit antireflection layer
Antireflection layer is a ZnO film.After a last thicknesses of layers reaches, stop the Mo target power supply, continue the sputter ZnO film, THICKNESS CONTROL is 25-75nm.
Although the inventor has done comparatively detailed elaboration to technical scheme of the present invention and has enumerated; Be to be understood that; For one of ordinary skill in the art; According to disclosed content, the foregoing description made to revise and/or change or adopt the replacement scheme that is equal to be conspicuous, it all can not break away from the present invention and require the scope protected.
Embodiment 1
Groove type solar high temperature of the present invention selects absorber coatings to comprise four tunics, from the matrix to the surface, is followed successively by infrared reflecting layer, first absorbed layer, second absorbed layer and antireflection layer, and said infrared reflecting layer is made up of the Mo film, and thickness is 20-120nm; First absorbed layer is the Mo+ZnO film, and thickness is 50-75nm, and wherein the content of ZnO is 20-40wt%; Second absorbed layer is the Mo+ZnO film, and thickness is 75-125nm, and wherein the content of ZnO is 40-50wt%; Said antireflection layer is a ZnO film, and thickness is 25-75nm.The performance of the solar selectively absorbing coating of the present invention's preparation is following: after 1 hour, the coating absorptivity is 92%-93% to the coating process 400 ℃ of vacuum annealings.
Claims (5)
1. a groove type solar high temperature is selected absorber coatings, from the matrix to the surface, is followed successively by infrared reflecting layer, first absorbed layer, second absorbed layer and antireflection layer, and said infrared reflecting layer is made up of the Mo film, and thickness is 20-120nm; First absorbed layer is the Mo+ZnO film, and thickness is 50-75nm, and wherein the content of ZnO is 20-40wt%; Second absorbed layer is the Mo+ZnO film, and thickness is 75-125nm, and wherein the content of ZnO is 40-50wt%; Said antireflection layer is a ZnO film, and thickness is 25-75nm.
2. the described absorber coatings of claim 1, the thickness that it is characterized in that said infrared reflecting layer is 30-90 nm.
3. the described absorber coatings of claim 1, the thickness that it is characterized in that first absorbed layer is 50-70 nm.
4. the described absorber coatings of claim 1, the thickness that it is characterized in that said second absorbed layer is 100-125 nm.
5. the described absorber coatings of claim 1, it is characterized in that said first absorbed layer and second absorbed layer thickness and for the 2-3 of said antireflection layer doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102203196A CN102721217A (en) | 2012-06-29 | 2012-06-29 | Groove type solar high-temperature selective absorption coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102203196A CN102721217A (en) | 2012-06-29 | 2012-06-29 | Groove type solar high-temperature selective absorption coating |
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| CN102721217A true CN102721217A (en) | 2012-10-10 |
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| CN2012102203196A Pending CN102721217A (en) | 2012-06-29 | 2012-06-29 | Groove type solar high-temperature selective absorption coating |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4098956A (en) * | 1976-08-11 | 1978-07-04 | The United States Of America As Represented By The Secretary Of The Interior | Spectrally selective solar absorbers |
| CN101724812A (en) * | 2008-10-24 | 2010-06-09 | 山东力诺新材料有限公司 | Coating and preparation method thereof |
| CN102108491A (en) * | 2010-12-30 | 2011-06-29 | 东莞市康达机电工程有限公司 | High-temperature solar selective absorbing coating and preparation method thereof |
-
2012
- 2012-06-29 CN CN2012102203196A patent/CN102721217A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4098956A (en) * | 1976-08-11 | 1978-07-04 | The United States Of America As Represented By The Secretary Of The Interior | Spectrally selective solar absorbers |
| CN101724812A (en) * | 2008-10-24 | 2010-06-09 | 山东力诺新材料有限公司 | Coating and preparation method thereof |
| CN102108491A (en) * | 2010-12-30 | 2011-06-29 | 东莞市康达机电工程有限公司 | High-temperature solar selective absorbing coating and preparation method thereof |
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Application publication date: 20121010 |