CN105779926A - New process of preparing high-temperature solar selective absorbing coating used in atmospheric environment - Google Patents
New process of preparing high-temperature solar selective absorbing coating used in atmospheric environment Download PDFInfo
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- CN105779926A CN105779926A CN201610382413.XA CN201610382413A CN105779926A CN 105779926 A CN105779926 A CN 105779926A CN 201610382413 A CN201610382413 A CN 201610382413A CN 105779926 A CN105779926 A CN 105779926A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
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Abstract
The invention relates to a novel compounding process of preparing a high-temperature solar selective absorbing coating used in atmospheric environment. Hypersonic flame spraying and laser surface cladding technologies are organically combined in the compounding process, AND the compounding process is mainly used for preparing a Co(Mo,W)-WC series solar selective absorbing coating used for a long time in the atmospheric environment at 500 DEG C. The compounding process has the advantages of being low in cost and easy to operate, coating powder is wide in selection range, the adhesive strength of a base material is high, the size, thickness and uniformly are controllable, the coating process technology is not limited by the size of a part, and the prepared coating is high in selectivity and absorbability, stable, high in thermal shock resistance and the like.
Description
Technical field
The present invention relates to coat preparing technology field, particularly relate to application and preparation high temperature solar energy selective absorption coating under atmospheric environment, a kind of new technology preparing solar selectively absorbing coating.
Background technology
Energy crisis is one of serious crisis of being faced of current human survival.Compared with numerous fossil energies, solar energy can approximate regards a kind of inexhaustible clean energy resource as.Solar energy source is in the thermonuclear reaction of solar interior, hydrogen is reaction material, the immense pressure existed due to the excessive temperature in solar interior depths and the most each layer, there occurs that hydrogen becomes the thermonuclear fusion reaction of helium, and in course of reaction, the quality of loss is just converted into energy to space radiation.And the Fossil fuel that the mankind are used, its energy is the most also from solar energy.According to statistics, compared with the nuclear energy that the current mankind can develop, underground heat homenergic, big compared with its gross reserves more than 5000 times of the solar radiant energy total amount that the earth is intercepted.The solar energy total amount that the earth accepts every year is then verified crude oil reserve nearly thousand times, is consume gross energy world's year more than 10,000 times.Thus Application of Solar Energy is a very promising research.
But, when utilizing heat collector to absorb solar energy, the energy of incident sunlight has reflection loss, conduction and convection losses, radiation loss on heat collector surface.Remainder is only the live part being obtained by for heat transfer agent takes away.Therefore, in order to maximally utilise the energy of incident sunlight, it is necessary for suppressing these heat loss as far as possible.For conduction and convection losses, transparent heat-insulated material can be used by adding a cover transparent cover plate on heat-absorbent surface surface or uses the methods such as vacuum tube collector to reduce the heat loss of this respect.For reflection loss and the radiation loss on suppression surface, then it is to utilize spectral selective absorbing coating to realize.When the energy projects of radiation is to body surface, can absorb simultaneously, reflect and transmission phenomenon.For the light wave of Same Wavelength, absorbance and the emissivity of material are equal, i.e. absorbance height the most correspondingly emissivity is the highest.But absorbance α and reflectance r and absorbance t can defer to relational expression: α+r+t=1.For opaque material, due to t=0, then α+r=1.And for black object, r ≈ 0, then α ≈ l.This is required indexing, it is simply that need high absorbance (α) and low emissivity (ε).From the above discussion, it is known that preparing solar selectively absorbing coating from the teeth outwards is a preferable method.But, the distribution of solar energy is the most uneven, and its optical radiation energy is mainly distributed in the spectral regions that wavelength X is 0.3 ~ 2.5 μm, say, that solar radiant energy is mainly distributed on visible ray and near infrared region.And object is heated and occurs the energy of black body radiation to be mainly distributed in the spectral regions that wavelength is 2 ~ 100 μm, namely main in far-infrared band.Therefore, maximally effective solar selectively absorbing coating is in the range of solar spectrum, i.e. λ < 2.5 μm, has α ≈ 1 (i.e. r ≈ 0)；And at λ > in the range of 2.5 μm, i.e. heat radiation wavelength, there is ε ≈ 0 (i.e. r ≈ 1 or α ≈ 0).But when reality prepares coating, after α reaches a certain numerical value, want to increase further α, ε and also can increase therewith.And, the value that the value that ε increases sometimes increases more than α, therefore in research, often the ratio (α/ε) of application α Yu ε characterizes the selective height of coating.In the actual application of solar selectively absorbing coating, it is also contemplated that the environmental factors impact on its performance, the such as factor such as temperature, humidity, acid-base value all may make the performance of coating impacted.
The research of solar selectively absorbing coating starts from the middle of last century.Solar thermal collector before uses blackboard paint and Berlin black as absorber coatings always, and this coating does not has selectivity.Until 1954, in first time world's solar energy conference, Israel Taylor expert and US Experts gill Dun Keer demonstrate the probability on the selective coating surface making high-absorbility and low-launch-rate, and propose black nickel and two kinds of face coats of black chromium respectively.Afterwards, the state such as Australia, Israel, Germany, Japan all puts into huge fund and carries out correlational study, develops a series of coating for selective absorption.Wherein, it is considered as a kind of classical architecture that University of Sydney, Australia works out the 3-tier architecture of coating, is generally used.This structure nexine is bright metallic reflector, and centre is solar absorbing layer, and outer layer is antireflection layer.Japanese Scientists have devised and makees substrate at aluminum, covers the coating of organic resin above.Pathkar deposits black cobalt the most on a glass substrate.Reis proposes to coat the coatings such as black nickel, black nickel plating on cobalt-based body.Kalleder uses sol-gal process from a kind of hydrolyzable, can produce carbon containing parent as coating material the compound of polycondensation.
From eighties of last century end of the seventies, China gradually carries out the research in terms of Solar use.The units such as Tsing-Hua University, Solar Energy Inst., Beijing, Liaoning Inst. of Energy Sources, Shanghai silicic acid institute of the Chinese Academy of Sciences, Beijing Non-Ferrous Metal Research General Academy and some solar energy enterprises begin one's study exploitation coating for selective absorption, successively develop vulcanized lead/asphalt caulk coating, black chrome coating, black cobalt coating, aluminum-nitrogen-oxygen gradation type coating for selective absorption.
Afterwards, Tsing-Hua University uses magnetron sputtering technique to prepare Al-N, Al-N-O coating in argon；Shanghai silicate institute proposes the black aluminium coating with organic material, glass and metal as substrate；Li Shouxiang have developed the coating of the aluminum cathode reaction using O, N jointly to participate in；It is aluminum nitrogen film that Shenyang Tai Yang Sunpower Corp. develops and apply top layer, and absorbed layer is the coating of aluminum carbon film；Zhang Yun mountain proposes the coating type coating being made up of heat-absorbing material and binding agent；A kind of coating being made up of optical absorbing agent, binding agent, solvent and auxiliary agent has been invented by Qingdao School of Architecture & Civil Engineering；Li Xianhang proposes metal-free ceramic-type coating.
The most typically use 316L stainless steel tube as the base material of coating for selective absorption.Use the 3-tier architecture coating that University of Sydney, Australia proposes.Be positioned at the thin film bottom (proximate substrate material) is infrared reflecting layer, this layer of material used mainly includes Al, Cr, Cu, Au, Ni, Ti, Ag, Mo, W etc. at present, higher infrared reflectivity (low emissivity) can be met, there is under high temperature higher antioxidation and anti-diffusivity, there is with base material the requirement of good adhesion simultaneously.Intermediate layer is absorbed layer, such as ceramic metal etc., has relatively antiradar reflectivity (high absorbance) at solar spectrum 0.3-2.5 mu m waveband, and has high reflectance (low emissivity) higher than the infrared band of 2.5 μm.Uppermost is antireflection layer, is most commonly used that monolayer SiO2Or Al2O3Thin film.It is positioned at the outermost layer of coating structure, is close to air, and Main Function is the reflectance reducing solar spectral, thus realizes solar absorptance to greatest extent.Sweden scientist prepares SiO with sol-gal process2Anti-reflection layer, makes the absorbance of coating bring up to 0.93 from 0.79 ~ 0.81, and emissivity is 0.03.But the preparation method of above coating is complicated, production environment requires height, and production efficiency is low and the cycle is longer, and input cost is higher.Therefore, for above deficiency, exploring and develop simple and practical, production efficiency is high, and the good technological process of obtained coating absorbent properties is a job with broad prospect of application.
Summary of the invention
The invention aims to provide a kind of and can be applicable to the novel preparation process of high temperature solar energy selective absorption coating under atmospheric environment.Technical characterstic is to utilize HVAF to prepare the solar selectively absorbing coating can being on active service for a long time in high temperature air environment, and utilize laser surface treating technology and mechanical polishing technology to reduce surface hole defect, improve coating compactness and reduce Coating Surface Roughness, thus it is high to obtain absorbance, the solar selectively absorbing coating that infrared emittance is low.This technique has with low cost, simple to operate, made that coating selective absorbing performance is high, coating stable, the advantages such as thermal shock resistance is strong.
The present invention realizes by the following technical solutions: a kind of prepare the new technology of high temperature solar energy selective absorption coating under atmospheric environment, and the matrix material used is uniform roughening treatment through surface；Described technique comprises the steps: to make powder → HVAF → Laser Surface Treatment → stress relief annealing → mechanical polishing: described in make powder step and use spray drying method to prepare composite powder, raw material is the mixture of metal dust and WC powder, temperature 280-300 to be maintained in drying tower○Between C, making composite powder after powder completes is uniform solid spherical, and particle diameter mean size is between 400 mesh to 600 mesh；Carrying out matrix material in HVAF step, propane does combustion gas, and oxygen does combustion-supporting gas, and compressed air does carrier gas；Propane pressure is at 0.5 MPa, and flow velocity is 20-30 L/min；Oxygen pressure is 0.6-0.7MPa, and flow velocity is 50-60 L/min, and compressed air pressure is 0.6 MPa, and powder sending quantity is 25 ± 3 g/min, and prepared coating layer thickness controls at 20-30 μ m；After spraying completes, coating is slowly cooled to room temperature, carries out Laser Surface Treatment step；Selecting wavelength, at solid or the semiconductor pulse laser of Visible-to-Near InfaRed wave band, coating is carried out surface process, laser power is 100-130W, and pulsewidth is 2ms, and scanning speed is 4-5mm/s；600 are carried out after Laser Surface Treatment○The stress relief annealing of C, 3h processes；Then mechanically polish, obtain high temperature solar energy selective absorption coating under atmospheric environment.
Further, described metal dust includes that Co powder and Mo powder, the weight/mass percentage composition of described Co powder, WC powder and Mo powder are respectively 72%, 8%, 20%；It is prepared as the granularity after composite powder between 400 mesh to 600 mesh.
Further, described metal dust is Co powder, and Co powder is respectively 80% and 20% with the weight/mass percentage composition of WC powder；It is prepared as the granularity after composite powder between 400 mesh to 700 mesh.
Technique of the present invention is mainly for the preparation of can be at atmospheric environment high temperature (>=500○C) solar selectively absorbing coating of application under the conditions of, excellent Co, Mo, the WC of this process selection resistance to elevated temperatures, decay resistance and antioxygenic property is as coating for selective absorption material, can ensure that selective absorbability (absorbance >=0.80 that coating is excellent, emissivity ε≤0.30), 500○C high temperature above environment can long service, corrosion-resistant, antioxidation, structure property is stable, the feature of active time length.
Further, matrix material select essence throw rustless steel, the pure compressed air utilizing pressure to be 0.3 ~ 0.4MPa by the corundum sand of 120 mesh with 70 ~ 80 ° of angle of attack high velocity jet to stainless steel surfaces so that it is surface is uniformly roughened.
Further, mechanical polishing is divided into rough polishing and essence to throw two steps；Coating throws roughness Ra≤0.6, rear surface μm in roughness Ra≤2, rough polishing rear surface μm, essence.
Further, through coating prepared by HVAF, should first carry out surface cleaning, remove residual powder, carry out Laser Surface Treatment the most again；Painting should be placed in pure water during Laser Surface Treatment and carry out forcing cooling, pure water water temperature should be 10 ~ 30○Between C.
Further, the cleaning step after mechanical polishing is also included；Use organic solvent during cleaning, supersonic cleaning machine is not shorter than the ultrasonic cleaning of 20 min, clean and carry out in 1 h after terminating mechanical polishing；Described organic solvent is acetone.
This technique can be used to the preparation solar selectively absorbing coating containing materials with high melting point such as Co, Mo, W, WC, such as coatings such as Co-AlN, Mo-WC, Co-W-WC, Co-Mo-WC.This technique is compared with existing preparation technology, have with low cost, simple to operate, the coated powder range of choice is extensive, and firm with substrate adhesion intensity, dimensional thickness is controlled with uniformity, coating process technology is not limited by the size of the workpiece, make coating selective absorbing performance high, coating stable, the advantages such as thermal shock resistance is strong.
Accompanying drawing explanation
Fig. 1 is the process chart of the solar selectively absorbing coating that present invention process prepares.
Detailed description of the invention
For being more fully understood that the present invention, in conjunction with two specific embodiments present invention process done below and illustrate further.But claimed technical solution of the invention is not limited only to the following examples.
Embodiment 1
This technique is utilized to prepare Co-Mo-WC high temperature solar energy selective absorption coating: slip mix homogeneously Co powder, WC powder and Mo powder prepared, its percentage composition is respectively 72%, 8%, 20%, composite powder is prepared by spray drying method, granularity is (optional 400,450,500,550,600 mesh), temperature 280-300 to be maintained in drying tower between 400 mesh to 600 mesh○C(may select 280○C、285○C、290、295○C 、300 ○C) between.
Metal matrix material selects 307 essences to throw rustless steels, and utilize pure compressed air that pressure is 0.3-0.4 MPa by the corundum sand of 120 mesh with 70 ~ 80 ° of angle of attack high velocity jet to stainless steel surfaces so that it is surface is uniformly roughened.After being roughened, same pure compressed air is utilized to be blown off by remnants gravel.
The method using HVAF, propane does combustion gas, and oxygen does combustion-supporting gas, and compressed air does carrier gas.Wherein, propane pressure is at 0.5 MPa, and flow velocity is 20-30 L/min.Oxygen pressure should be higher than that selected propane pressure 0.1-0.2 MPa, and flow velocity is 50-60 L/min, and compressed air pressure is 0.6 MPa, and powder sending quantity is 25 ± 3 g/min.The coating layer thickness prepared should control at 20-30 μ m.Through coating prepared by HVAF, carry out surface cleaning.
After spraying completes, coating is slowly cooled to room temperature, selects wavelength to carry out surface process at solid or the semiconductor pulse laser of Visible-to-Near InfaRed wave band.Laser power is 100-130 W(100 W, 110 W, 120 W, 130 W), pulsewidth is 2 ms, and scanning speed is 4-5 mm/s.Painting is placed in pure water by processing procedure and carries out forcing cooling, pure water water temperature 20○About C.
600 are carried out after Laser Surface Treatment○The stress relief annealing of C, 3 h processes.
Should carry out mechanical polishing process after stress relief annealing, mechanical polishing is divided into rough polishing and essence throwing two steps to carry out.Coating throws roughness Ra≤0.6, rear surface μm in roughness Ra≤2, rough polishing rear surface μm, essence.
Coating uses acetone and other organic solvent after terminating polishing in 1 h, be not shorter than the ultrasonic cleaning of 20 min in supersonic cleaning machine.
The spectral absorption performance test result of Co-Mo-WC high temperature solar energy selective absorption coating prepared shows that the standby solar selectively absorbing coating of this project system has excellent solar spectral selective absorbability, and test result is as shown in table 1:
Embodiment 2
This technique is utilized to prepare Co-WC high temperature solar energy selective absorption coating: by slip mix homogeneously standby to Co powder, WC powder, its percentage composition is respectively 80%, 20%, composite powder is prepared by spray drying method, granularity is (optional 400,450,500,650,700 mesh), temperature 280-300 to be maintained in drying tower between 400 mesh to 700 mesh○C(may select 280○C、285○C、290、295○C 、300 ○C) between.
Metal matrix material selects 307 essences to throw rustless steels, and utilize pure compressed air that pressure is 0.3-0.4 MPa by the corundum sand of 120 mesh with 70 ~ 80 ° of angle of attack high velocity jet to stainless steel surfaces so that it is surface is uniformly roughened.After being roughened, same pure compressed air is utilized to be blown off by remnants gravel.
The method using HVAF, propane does combustion gas, and oxygen does combustion-supporting gas, and compressed air does carrier gas.Wherein, propane pressure is at 0.5 MPa, and flow velocity is 20-30 L/min.Oxygen pressure should be higher than that selected propane pressure 0.1-0.2 MPa, and flow velocity is 50-60 L/min, and compressed air pressure is 0.6 MPa, and powder sending quantity is 25 ± 3 g/min.The coating layer thickness prepared should control at 20-30 μ m.Through coating prepared by HVAF, carry out surface cleaning.
After spraying completes, coating is slowly cooled to room temperature, selects wavelength to carry out surface process at solid or the semiconductor pulse laser of Visible-to-Near InfaRed wave band.Laser power is 100-130 W(100 W, 110 W, 120 W, 130 W), pulsewidth is 2 ms, and scanning speed is 4-5 mm/s.Painting is placed in pure water by processing procedure and carries out forcing cooling, pure water water temperature 20○About C.
600 are carried out after Laser Surface Treatment○The stress relief annealing of C, 3 h processes.
Should carry out mechanical polishing process after stress relief annealing, mechanical polishing is divided into rough polishing and essence throwing two steps to carry out.Coating throws roughness Ra≤0.6, rear surface μm in roughness Ra≤2, rough polishing rear surface μm, essence.
Coating uses acetone and other organic solvent after terminating polishing in 1 h, be not shorter than the ultrasonic cleaning of 20 min in supersonic cleaning machine.
The spectral absorption performance test result of Co-WC high temperature solar energy selective absorption coating prepared shows that the standby solar selectively absorbing coating of this project system has excellent solar spectral selective absorbability, and test result is as shown in table 2:
Claims (8)
1. preparing a new technology for high temperature solar energy selective absorption coating under atmospheric environment, the matrix material used is uniform roughening treatment through surface；It is characterized in that, described technique comprises the steps: to make powder → HVAF → Laser Surface Treatment → stress relief annealing → mechanical polishing: described in make powder step and use spray drying method to prepare composite powder, raw material is the mixture of metal dust and WC powder, temperature 280-300 to be maintained in drying tower○Between C, making composite powder after powder completes is uniform solid spherical, and particle diameter mean size is between 400 mesh to 700 mesh；Carrying out matrix material in HVAF step, propane does combustion gas, and oxygen does combustion-supporting gas, and compressed air does carrier gas；Propane pressure is at 0.5 MPa, and flow velocity is 20-30 L/min；Oxygen pressure is 0.6-0.7MPa, and flow velocity is 50-60 L/min, and compressed air pressure is 0.6 MPa, and powder sending quantity is 25 ± 3 g/min, and prepared coating layer thickness controls at 20-30 μ m；After spraying completes, coating is slowly cooled to room temperature, carries out Laser Surface Treatment step；Selecting wavelength, at solid or the semiconductor pulse laser of Visible-to-Near InfaRed wave band, coating is carried out surface process, laser power is 100-130W, and pulsewidth is 2ms, and scanning speed is 4-5mm/s；600 are carried out after Laser Surface Treatment○The stress relief annealing of C, 3h processes；Then mechanically polish, obtain high temperature solar energy selective absorption coating under atmospheric environment.
2. preparation as claimed in claim 1 new technology of high temperature solar energy selective absorption coating under atmospheric environment, it is characterized in that, matrix material selects essence to throw rustless steel, the pure compressed air utilizing pressure to be 0.3 ~ 0.4MPa by the corundum sand of 120 mesh with 70 ~ 80 ° of angle of attack high velocity jet to stainless steel surfaces so that it is surface is uniformly roughened.
3. preparation as claimed in claim 2 new technology of high temperature solar energy selective absorption coating under atmospheric environment, it is characterised in that described metal dust includes that Co powder and Mo powder, the weight/mass percentage composition of described Co powder, WC powder and Mo powder are respectively 72%, 8%, 20%；It is prepared as the granularity after composite powder between 400 mesh to 600 mesh.
4. preparation as claimed in claim 2 new technology of high temperature solar energy selective absorption coating under atmospheric environment, it is characterised in that described metal dust is Co powder, and Co powder is respectively 80% and 20% with the weight/mass percentage composition of WC powder；It is prepared as the granularity after composite powder between 400 mesh to 700 mesh.
5. the new technology of high temperature solar energy selective absorption coating under atmospheric environment of the preparation as described in any one of claim 1 ~ 4, it is characterised in that mechanical polishing is divided into rough polishing and essence to throw two steps；Coating throws roughness Ra≤0.6, rear surface μm in roughness Ra≤2, rough polishing rear surface μm, essence.
6. the new technology of high temperature solar energy selective absorption coating under atmospheric environment of the preparation as described in any one of claim 1 ~ 4, it is characterized in that, through coating prepared by HVAF, should first carry out surface cleaning, remove residual powder, carry out Laser Surface Treatment the most again；Painting should be placed in pure water during Laser Surface Treatment and carry out forcing cooling, pure water water temperature should be 10 ~ 30○Between C.
7. preparation as claimed in claim 1 or 2 new technology of high temperature solar energy selective absorption coating under atmospheric environment, it is characterised in that also include the cleaning step after mechanical polishing；Use organic solvent during cleaning, supersonic cleaning machine is not shorter than the ultrasonic cleaning of 20 min, clean and carry out in 1 h after terminating mechanical polishing.
8. preparation as claimed in claim 7 new technology of high temperature solar energy selective absorption coating under atmospheric environment, it is characterised in that described organic solvent is acetone.
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| CN108559992A (en) * | 2018-01-23 | 2018-09-21 | 南京工业大学 | Preparation method of multi-scale metal ceramic solar selective absorption coating |
| CN109848551A (en) * | 2018-12-04 | 2019-06-07 | 北京航空航天大学 | A kind of method that ultrafast laser processing carbide-base ceramics surface micro-nano structure reduces light reflectivity |
| CN109957796A (en) * | 2019-04-11 | 2019-07-02 | 新余学院 | The preparation method of solar selectively absorption WC-Co composite coating |
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| CN108559992A (en) * | 2018-01-23 | 2018-09-21 | 南京工业大学 | Preparation method of multi-scale metal ceramic solar selective absorption coating |
| CN109848551A (en) * | 2018-12-04 | 2019-06-07 | 北京航空航天大学 | A kind of method that ultrafast laser processing carbide-base ceramics surface micro-nano structure reduces light reflectivity |
| CN109957796A (en) * | 2019-04-11 | 2019-07-02 | 新余学院 | The preparation method of solar selectively absorption WC-Co composite coating |
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