CN114405797B - Graphene coating based on liquid material plasma spraying technology and spraying process thereof - Google Patents
Graphene coating based on liquid material plasma spraying technology and spraying process thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/20—Aqueous dispersion or solution
Abstract
The invention relates to a graphene coating based on a liquid material plasma spraying technology and a spraying process thereof, and belongs to the technical field of coatings. The process comprises the steps of preheating a substrate to 100-300 ℃, and depositing a graphene suspension on the surface of the substrate by a spray gun through a liquid material plasma spraying technology to obtain the graphene coating; the concentration of the graphene suspension is 0.5-2mg/mL; the power of the spray gun is 28-36kW, the current is 780-850A, and the voltage is 36-42V; the spraying distance is 40-200mm; the moving speed of the spray gun is 50-1000mm/s; the spraying cycle times are 2-50 times; the temperature of the substrate in the spraying process is 400-600 ℃. The spraying process of the graphene coating has the characteristics of simple flow, short production period, high production efficiency and the like, and the prepared graphene coating has the advantages of larger preparation size, higher coating bonding strength and more applicable matrix types.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a graphene coating based on a liquid material plasma spraying technology and a spraying process thereof.
Background
The graphene has excellent optical, electrical and mechanical properties, and has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like. Currently, conventional methods for preparing graphene coatings include vapor deposition (CVD) and suction filtration. First, the CVD method for producing graphene-based coatings requires a high temperature and vacuum environment, and then carbon-containing gaseous substances and hydrogen gas as a reducing gas are introduced into a closed reaction furnace. Therefore, the CVD method limits the size of the substrate, cannot deposit in large size, has slow deposition speed and long preparation period. In addition, CVD produces graphene coatings that can only be grown on specific metal substrate surfaces, and there is only weak van der waals bonding between the coating and the substrate. And secondly, the preparation method of the suction filtration comprises the steps of pouring the graphene dispersion liquid into a suction filtration bottle filled with a filter membrane, and forming a graphene thin layer on the basement membrane in a vacuum filtration mode. The preparation method can only obtain a graphene thin layer, weak van der Waals force bonding can be formed between the graphene thin layer and a substrate, and the graphene coating prepared by the suction filtration method at present is only within 10 cm. Therefore, the conventional graphene coating preparation technology is not suitable for practical functional applications.
Patent CN105063571 discloses a method for preparing three-dimensional graphene on a stainless steel substrate, which utilizes a Chemical Vapor Deposition (CVD) method to prepare three-dimensional graphene, and the principle is that a carbon-containing gaseous substance is introduced into a furnace under the environment of high temperature and high vacuum by using hydrogen as reducing gas, and all generated graphene is the deposited substrate surface. However, when a graphene coating attached to a given substrate needs to be prepared, since the chemical vapor deposition of graphene can only obtain graphene attached to a growth substrate (such as copper foil) and the bonding form is weak van der waals force, plasma spraying is a technology for material surface strengthening and surface modification after transfer and bonding with a target substrate (such as using a binder), so that the surface of the substrate can have the performances of wear resistance, corrosion resistance, high-temperature oxidation resistance, electrical insulation, heat insulation, radiation protection, wear reduction, sealing and the like.
The plasma spraying technique is a method of heating a material such as ceramics, alloys, metals, etc. to a molten or semi-molten state by using a plasma arc driven by a direct current as a heat source, and spraying the material at a high speed onto the surface of a pretreated workpiece to form a firmly adhered surface layer. Aiming at the problems of limited preparation size, long preparation period, limited applicable matrix, weak bonding strength and the like of the existing graphene coating, the liquid material plasma spraying technology is used for researching and developing a high-mechanical-strength graphene coating which can be deposited on various matrixes rapidly and is large in size and can be applied to engineering.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of limited preparation size, long preparation period, limited applicable matrix, weak bonding strength and the like in the prior art.
In order to solve the technical problems, the invention provides a graphene coating based on a liquid material plasma spraying technology and a spraying process thereof. The spraying process comprises the processes of graphene liquid-phase feeding preparation and coating deposition, wherein the liquid-phase feeding is aqueous or organic uniform and stable graphene dispersion liquid obtained by emulsification, dispersion and other methods. The graphene coating with excellent mechanical properties can be rapidly deposited on different substrates in large size by means of a liquid material plasma spraying technology.
The first purpose of the invention is a spraying process of a graphene coating based on a liquid material plasma spraying technology, which comprises the following steps of preheating a substrate to 100-300 ℃, and depositing a graphene suspension on the surface of the substrate by a spray gun by adopting the liquid material plasma spraying technology to obtain the graphene coating; the concentration of the graphene suspension is 0.5-2mg/mL; the power of the spray gun is 28-36kW, the current is 780-850A, and the voltage is 36-42V; the spraying distance is 40-200mm; the moving speed of the spray gun is 50-1000mm/s; the spraying cycle times are 2-50; the temperature of the substrate in the spraying process is 400-600 ℃.
In one embodiment of the invention, the deposition rate of the graphene coating is 0.5-5 μm/min.
In one embodiment of the invention, preheating the substrate may ensure efficient deposition of the graphene coating and achieve high interfacial bonding. Controlling the temperature of the substrate during the spraying process can prevent the carbonization or ablation of graphene on the substrate.
In one embodiment of the invention, the spray gun moves by being mounted on the mechanical arm, and the moving track and speed are set by changing the moving parameters of the mechanical arm.
In one embodiment of the invention, the feed flow rate and the spray distance are set to ensure that the graphene droplets can possess sufficient enthalpy while preventing carbonization of the already deposited coating. By utilizing the typical non-equilibrium process and extremely short heating time of liquid material plasma spraying, graphene is not easily oxidized in the spraying process.
In one embodiment of the invention, the material of the substrate is metal, ceramic, glass and plastic. Further, the metal is stainless steel and/or a nickel-based alloy; the ceramic is alumina and/or silicon dioxide; the plastic is high-temperature-resistant plastic, and the matrix can not be damaged in the spraying process. The graphene coating is combined with the matrix such as alumina, stainless steel, nickel-based alloy, silicon dioxide and the like to form a boundary, and the coating is combined with the matrix through mechanical occlusion force with high strength.
In one embodiment of the invention, the surface of the substrate is subjected to sand blasting, and the thickness of the substrate is 1-100mm. The surface of the substrate can be subjected to sand blasting treatment or surface roughening treatment.
In one embodiment of the invention, the graphene suspension is supplied at a flow rate of 5-50mL/min.
In one embodiment of the invention, in the liquid material plasma spraying technology, the main air pressure is 0.4-0.8MPa, the main air flow is 30-70L/min, the auxiliary air pressure is 0.3-0.6MPa, and the auxiliary air flow is 2-50L/min.
In one embodiment of the invention, the main gas used in the liquid material plasma spraying technology is argon and/or nitrogen; the auxiliary gas is hydrogen or helium.
The second purpose of the invention is a graphene coating obtained by the spraying process.
In one embodiment of the present invention, the graphene coating has a thickness of 1-50 μm.
The third purpose of the invention is to provide the application of the graphene coating in the fields of wear resistance and corrosion resistance.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The graphene coating disclosed by the invention utilizes a plasma spraying process, and the thickness of the graphene coating is effectively regulated and controlled by changing the concentration of a graphite dispersion solution, the flow rate of a liquid material, the moving state of a spray gun and the spraying cycle number. The graphene droplets have higher enthalpy value when being deposited on the coating, and can be efficiently deposited and simultaneously form mechanical occlusion with various substrates, so that mechanical occlusion force far stronger than weak van der Waals force is formed, and the deposition efficiency of the coating can be intuitively set only by controlling the movement parameters of a mechanical arm moved by the spray gun.
(2) The spraying process of the graphene coating has the characteristics of simple flow, short production period, high production efficiency and the like, and compared with the conventional preparation method of the graphene coating, the graphene coating prepared by the method has the advantages of larger preparation size, higher coating bonding strength and more applicable matrix types, and can be used for various graphene coatings for practical engineering application, such as wear resistance, wear reduction, corrosion resistance and the like.
(3) The spraying area and the layer thickness of the graphene coating can be selected according to specific functions, and the deposition efficiency of the coating can be changed by improving the power of a spray gun or adjusting the spraying distance on the premise of not oxidizing the coating, so that the aim of the invention is better fulfilled.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic view of a spray gun used in the present invention.
Fig. 2 is a schematic diagram of depositing a graphene coating by using a plasma material ion spraying technique.
Fig. 3 is a schematic diagram of a CVD method for preparing a graphene coating.
Fig. 4 is a friction performance test chart of a graphene coating prepared by liquid material plasma spraying.
Fig. 5 is a friction performance test chart of the graphene coating prepared by CVD.
Fig. 6 is a Nyquist plot of electrochemical ac impedance testing of graphene coatings and aluminum alloy substrates.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1
Referring to fig. 1-2, a graphene coating based on a liquid plasma spraying technology and a spraying process thereof specifically include the following steps:
(1) Preparing a graphene suspension: graphite dispersion solution with concentration of 1mg/mL is adopted, and deionized water is used as a solvent.
(2) Matrix: the substrate was a surface-blasted alumina substrate with a thickness of 1.8mm, and was preheated to 200 ℃.
(3) The spraying technology comprises the following steps: setting spraying process parameters, and depositing the graphene suspension on the surface of the matrix by a spray gun by adopting a liquid material plasma spraying technology to obtain a graphene coating; the movement of the spray gun is realized by erecting a plasma spray gun on a mechanical arm, the moving speed of the mechanical arm is set to be 200mm/s, the spraying distance is set to be 100mm, and the spraying cycle number is 20. The flow rate of the liquid material is set to be 30mL/min; the power of the spray gun is set to be 32kW, wherein the current is set to be 800A, the voltage is set to be 40V, the main air pressure is 0.7MPa, the main air flow is 50L/min, the auxiliary air pressure is 0.4MPa, and the auxiliary air flow is 25L/min; the spraying technique uses helium as an auxiliary gas; argon was used as the main gas, and the temperature of the substrate during spraying was 500 ℃. The thickness of the graphene coating is set to be 20 mu m, the deposition speed of the graphene coating is set to be 3 mu m/min, and the total size is 2836mm 2 。
Example 2
Referring to fig. 1-2, a graphene coating based on a liquid plasma spraying technology and a spraying process thereof specifically include the following steps:
(1) Preparing a graphene suspension: graphite dispersion solution with concentration of 1.5mg/mL is adopted, and deionized water is used as solvent.
(2) Matrix: the substrate is a stainless steel substrate with the surface subjected to sand blasting treatment, the thickness of the substrate is set to be 1.8mm, and the substrate is preheated to 200 ℃.
(3) The spraying technology comprises the following steps: setting spraying process parameters, and depositing the graphene suspension on the surface of the substrate by a spray gun by adopting a liquid plasma spraying technology to obtain a graphene coating; the plasma spray gun is erected on the mechanical arm to realize the movement of the spray gun, the moving speed of the mechanical arm is set to be 200mm/s, the spraying distance is set to be 100mm,the number of spraying cycles was 20. The flow rate of the liquid material is set to be 30mL/min; setting the power of the spray gun to be 32kW, wherein the current is set to be 800A, the voltage is set to be 40V, the main air pressure is 0.7MPa, the main air flow is 50L/min, the auxiliary air pressure is 0.4MPa, and the auxiliary air flow is 25L/min; the spraying technique uses helium as an auxiliary gas; argon is used as main gas, the temperature of a matrix is 500 ℃ in the spraying process, the thickness of the obtained graphene coating is 31 mu m, the deposition speed of the graphene coating is 4.6 mu m/min, and the total size is 2796mm 2 。
Example 3
Referring to fig. 1-2, a graphene coating based on a liquid plasma spraying technology and a spraying process thereof specifically include the following steps:
(1) Preparing a graphene suspension: the influence of the concentration of the prefabricated suspension on the deposition efficiency is compared by adopting a graphite dispersion solution with the concentration of 2mg/mL and using deionized water as a solvent.
(2) Matrix: the substrate was a surface-sand-blasted alumina substrate with a thickness of 1.8mm, and was preheated to 200 ℃.
(3) The spraying technology comprises the following steps: setting spraying process parameters, and depositing the graphene suspension on the surface of the substrate by a spray gun by adopting a liquid plasma spraying technology to obtain a graphene coating; the movement of the spray gun is realized by erecting a plasma spray gun on a mechanical arm, the moving speed of the mechanical arm is set to be 200mm/s, the spraying distance is set to be 100mm, and the spraying cycle number is 20. The flow rate of the liquid material is set to be 30mL/min; the power of the spray gun is set to be 32kW, wherein the current is set to be 800A, the voltage is set to be 40V, the main air pressure is 0.7MPa, the main air flow is 50L/min, the auxiliary air pressure is 0.4MPa, and the auxiliary air flow is 25L/min; the spraying technique uses helium as an auxiliary gas; argon is used as main gas, the temperature of a matrix is 500 ℃ in the spraying process, the thickness of the obtained graphene coating is 36 mu m, the deposition speed of the graphene coating is 5.4 mu m/min, and the total size is 2822mm 2 。
Example 4
Referring to fig. 1-2, a graphene coating based on a liquid plasma spraying technology and a spraying process thereof specifically include the following steps:
(1) Preparing a graphene suspension: the influence of the concentration of the prefabricated solution on the deposition efficiency is compared by adopting a graphite dispersion solution with the concentration of 0.3mg/mL and taking deionized water as a solvent.
(2) Matrix: the substrate is a nickel-based alloy substrate with the surface subjected to sand blasting treatment, the thickness of the substrate is set to be 1.8mm, and the substrate is preheated to 200 ℃.
(3) The spraying technology comprises the following steps: setting spraying process parameters, and depositing the graphene suspension on the surface of the matrix by a spray gun by adopting a liquid material plasma spraying technology to obtain a graphene coating; the movement of the spray gun is realized by erecting a plasma spray gun on a mechanical arm, the moving speed of the mechanical arm is set to be 200mm/s, the spraying distance is set to be 100mm, and the spraying cycle number is 20. The flow rate of the liquid material is set to be 30mL/min; the power of the spray gun is set to be 32kW, wherein the current is set to be 800A, the voltage is set to be 40V, the main air pressure is 0.7MPa, the main air flow is 50L/min, the auxiliary air pressure is 0.4MPa, and the auxiliary air flow is 25L/min; helium and argon are used as gases for the spraying technology, the temperature of the matrix is 500 ℃ in the spraying process, the thickness of the obtained graphene coating is 5.4 mu m, the deposition speed of the graphene coating is 0.8 mu m/min, and the total size is 2822mm 2 。
Comparative example 1
(1) Preparing a graphene suspension: graphite dispersion solution with concentration of 1mg/mL is adopted, and deionized water is used as a solvent.
(2) Matrix: the substrate was a surface-sand-blasted alumina substrate with a thickness of 1.8mm, and was preheated to 200 ℃.
(3) The spraying technology comprises the following steps: setting spraying process parameters, and depositing the graphene suspension on the surface of the matrix by a spray gun by adopting a liquid material plasma spraying technology to obtain a graphene coating; the movement of the spray gun is realized by erecting a plasma spray gun on a mechanical arm, the moving speed of the mechanical arm is set to be 200mm/s, the spraying distance is set to be 100mm, and the spraying cycle number is 20. The flow rate of the liquid material is set to be 30mL/min; the power of the spray gun is set to 40kW, wherein the current is set to 850A, the voltage is set to 47V, the main air pressure is 0.7MPa, the main air flow is 54L/min, the auxiliary air pressure is 0.4MPa, and the auxiliary air flow is 27L/min; the spraying technique uses helium as an auxiliary gas; argon was used as the main gas, and the temperature of the substrate during spraying was 500 ℃.The thickness of the graphene coating is set to be 20 mu m, the deposition speed of the graphene coating is set to be 3 mu m/min, and the total size is 2836mm 2 。
Comparative example 2
Referring to fig. 3, a graphene coating is obtained by a CVD method, which includes the following specific steps:
(1) Matrix: drying the quartz slide for later use; annealing 25 μm to 10mm copper foil, soaking in organic solution, cleaning, and oven drying.
(2) CVD technique: placing the copper foil on a quartz slide, sending the quartz slide to a heating zone, repeatedly vacuumizing and sending argon to remove oxygen, heating the heating chamber to 1000 ℃ and maintaining the temperature for 90 minutes, carrying ethanol into the heating chamber by using argon after preheating is finished, keeping the temperature for a period of time, cooling to room temperature, and taking out the copper foil with the graphene coating. The thickness of the graphene coating is set to be 6 mu m, and the total size is 100mm 2 。
Test example 1
The thickness of the graphene coating layers of examples 1-4 and comparative example 1 were measured and observed, and it can be seen that the thickness and deposition efficiency of the coating layers increased as the concentration of the graphene suspension increased. Observing the graphene coating surface in example 4, a lateral deposition effect appears, and the bonding strength between the coating and the substrate is slightly weakened compared with that of example 1, but the graphene coating surface is dense. The deposition efficiency of the coating in example 3 compared to the graphene suspension concentration was slightly lower than that obtained in the other examples, because the graphene suspension was thicker and less transportable, and the mass of the droplets was larger during flight, with some deviation from staying in the center of the plasma flame. Comparing the coatings obtained in examples 1 to 4 with the coating obtained in comparative example 1, the graphene coatings obtained in examples 1 to 4 have dense surfaces, while the graphene coating obtained in comparative example 1 has cracking, chipping and the like. Therefore, the thickness and the deposition rate of the graphene coating are positively correlated with the concentration of the graphene suspension, but too high or too low concentration parameters are not beneficial to the formation and combination of the coating; too high a spraying power can generate too large internal stresses, which destroy the dense structure of the coating surface.
Test example 2
The graphene coatings prepared in example 1 and comparative example 2 were subjected to a friction performance test, and alumina press balls having a diameter of 4mm were placed on the graphene coatings at a pressure of 2N and subjected to a long sliding distance to test a friction factor change.
Fig. 4 is a friction performance test chart of a graphene coating prepared by liquid plasma spraying, as shown in fig. 4, in a friction wear test process with a length of 150m, the friction coefficient of the graphene coating prepared by liquid plasma spraying is always stable at about 0.175 except for fluctuation in a very short time at the beginning, and after sliding for 100m, the friction coefficient is even slowly reduced to 0.17, which shows that the graphene coating prepared by liquid plasma spraying has excellent wear resistance stability and self-lubricating performance.
Fig. 5 is a friction performance test chart of a graphene coating prepared by CVD, and as shown in fig. 5, under the same experimental conditions, the friction coefficient of the graphene coating prepared by a vapor deposition method is stabilized at 0.17 before sliding to 50m, the friction resistance of the coating is damaged with the increase of the sliding distance, and the friction coefficient gradually increases to 0.19 after sliding to 150m, which shows that the graphene coating obtained by plasma spraying has better friction performance.
Test example 3
Since the bonding strength of the graphene coating and the substrate obtained in comparative example 2 is too low to perform the electrochemical ac impedance test, the graphene coating and the aluminum alloy substrate prepared in example 1 were tested using a CHI 750E type electrochemical workstation. The test adopts a three-electrode working system, the self-made coating is used as a working electrode, a platinum sheet is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, the test solution is 3.5 percent of NaCl solution, the amplitude is 10mV, and the scanning frequency range is 10kHz-1mHz.
The obtained data is arranged to obtain a Nyquist diagram of the electrochemical alternating current impedance test of the graphene coating and the aluminum alloy matrix, as shown in fig. 6, as can be seen from the Nyquist diagram, after the matrix with the graphene coating combined on the surface is soaked in the test solution, the Nyquist diagram is presented as a single-capacitance arc resistance and has a large arc radius, which is almost perpendicular to the abscissa, which indicates that the coating is equivalent to a pure resistor at this time, and a complete barrier effect is achieved. And the single-capacitance arc resistance radius of the coating of the uncoated substrate is far smaller than that of a Nyquist diagram of the coated substrate, and a trailing arc appears in a low-frequency band, which indicates that a corrosive medium starts to permeate, the impedance is gradually reduced, the capacitance is gradually increased, and the corrosion resistance is reduced. Therefore, the matrix with the graphene coating combined on the surface has better corrosion resistance than the matrix without the spraying coating.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (8)
1. A spraying process of a graphene coating is characterized by comprising the following steps of preheating a substrate to 100-300 ℃, and depositing a graphene suspension on the surface of the substrate by a spray gun by adopting a liquid plasma spraying technology to obtain the graphene coating; the concentration of the graphene suspension is 0.5-2mg/mL; the power of the spray gun is 28-36kW, the current is 780-850A, and the voltage is 36-42V; the spraying distance is 40-200mm; the moving speed of the spray gun is 50-1000mm/s; the spraying cycle times are 2-50 times; the temperature of the matrix in the spraying process is 400-600 ℃; the deposition rate of the graphene coating is 0.5-5 mu m/min; the feeding flow rate of the graphene suspension is 5-50mL/min.
2. The spraying process of the graphene coating according to claim 1, wherein the material of the substrate is metal, ceramic, glass or plastic.
3. The spraying process of the graphene coating according to claim 1, wherein the thickness of the substrate is 1-100mm.
4. The spraying process of the graphene coating according to claim 1, wherein in the liquid plasma spraying technology, the main gas pressure is 0.4-0.8MPa, the main gas flow is 30-70L/min, the auxiliary gas pressure is 0.3-0.6MPa, and the auxiliary gas flow is 2-50L/min.
5. The spraying process of the graphene coating according to claim 4, wherein the main gas for the liquid plasma spraying technology is argon and/or nitrogen; the auxiliary gas is hydrogen or helium.
6. Graphene coating obtained by the spray coating process according to any one of claims 1 to 5.
7. The graphene coating according to claim 6, wherein the graphene coating has a thickness of 1-50 μm.
8. Use of the graphene coating according to any one of claims 6 to 7 in the fields of wear resistance and corrosion resistance.
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