471 results about "Graphene coating" patented technology

The invention provides a high-rate and high-first-effect biomass hard carbon composite negative electrode material and a preparation method and application thereof, the hard carbon composite negative electrode material has a core-shell structure, the core-shell structure comprises a core, an inner shell and an outer shell, the core comprises biomass hard carbon containing P and graphite microcrystals, the inner shell comprises graphene, and the outer shell comprises a carbon nanotube. According to the invention, the surface of the biomass hard carbon is coated with the graphene layer, the carbon nanotubes grow on the surface of the graphene in situ, and transition metal synergistically induces the hard carbon to be arranged and grow along the graphene layer in a high-temperature carbonization process, so that the graphene coating layer is tightly coated, and the cycle performance of the material is improved; transition metal ions catalyze graphitization to generate a more regular and ordered graphite-like layer microcrystalline structure coating layer, so that the defects of graphene and carbon nanotubes are reduced, and the first coulombic efficiency is improved; in addition, the ion transmission capability is improved by phosphorus doping, the electron transmission capability is improved by graphite microcrystals generated by catalysis in hard carbon, and the rate capability is ensured by synergistic improvement of ion transmission and electron transmission.

The invention relates to the technical field of power transmission, in particular to a moisture-proof cable which sequentially comprises a conductive wire core, a gradient buffer layer, a dynamic sealing layer, a flexible supporting layer and a self-repairing sheath from inside to outside. A gradient buffer layer; the dynamic sealing layer is of a split type sealing structure formed by an outer ring surface sealing lip and an inner ring surface static sealing belt, the outer ring surface sealing lip is formed by embedding a polytetrafluoroethylene fiber reinforcing layer in a silicone rubber matrix, and the surface of the outer ring surface sealing lip is coated with a humidity response type graphene coating; the flexible supporting layer is formed by spirally winding a nickel-titanium alloy belt, and bionic fish scales are welded to the surface of the nickel-titanium alloy belt; the self-repairing sheath is characterized in that a hexagonal honeycomb structure is molded on the outer layer, hydroxyl-terminated polysiloxane and a platinum catalyst are contained in an A-type microcapsule, and modified epoxy resin is contained in a B-type microcapsule. The moisture-proof cable shows excellent corrosion resistance, moisture resistance and self-repairing capability in a humid environment, and can maintain good performance when subjected to external physical impact.

The invention discloses a graphene flat cable coating anti-drop FPC connector, and relates to the technical field of connectors, the graphene flat cable coating anti-drop FPC connector comprises a connector body, a flip cover body is rotatably arranged above the connector body, a terminal body is arranged in the connector body in a butt joint manner, and a flexible flat cable body is arranged in the connector body in a butt joint manner. A movable groove is formed in the rear side of the connector body, a terminal abutting mechanism is arranged in the movable groove, and the terminal abutting mechanism abuts against the terminal body through the flip cover body so as to reduce contact with the flexible flat cable body. According to the anti-drop FPC connector for the graphene flat cable coating, the lower side of the flexible flat cable body is provided with the graphene layer capable of enhancing the conductivity and the heat dissipation performance of the flexible flat cable body, and the inclined guide part arranged at the front side of the connector body can be used for performing butt-joint plugging guide on the flexible flat cable body, so that the graphene coating arranged at the lower side of the flexible flat cable body is protected; the contact area of the graphene and the plastic wall is reduced, and the graphene layer is prevented from being damaged.

The invention provides a shell, a preparation method thereof and electronic equipment. The shell provided by the embodiment of the invention comprises fiber cloth; the graphene coating is coated on the periphery of a part of the fiber cloth; the surface of the fiber cloth and the surface of the graphene coating are wrapped with the resin layer. The shell provided by the embodiment of the invention has relatively high rigidity and heat conductivity coefficient, and does not affect the transmission of electromagnetic wave signals.

The invention relates to the technical field of power electronic components, and discloses a high-temperature-resistant electrolytic capacitor which comprises the following components in parts by weight: 80-90 parts of a graphene or carbon nanotube coating used for preparing an electrolytic capacitor shell; the invention further provides a preparation method of the high-temperature-resistant electrolytic capacitor, and the preparation method comprises the following steps: heat conduction optimization design: simulating a temperature field of the electrolytic capacitor through an unsteady-state heat conduction equation, optimizing a heat dissipation path of the electrolytic capacitor, and improving the heat dissipation performance of the electrolytic capacitor; and heat can be uniformly conducted to an external heat dissipation device. By introducing the microencapsulated phase change material, the graphene coating and the accurate temperature sensor array and optimizing heat dissipation design, efficient heat dissipation, temperature balance and long-term stability of the electrolytic capacitor in a high-temperature environment are achieved, the working performance of the electrolytic capacitor is remarkably improved, and the service life of the electrolytic capacitor is remarkably prolonged.

The present invention discloses a graphene-coated lithium iron phosphate cathode material and a preparation method thereof, belonging to the technical field of lithium iron phosphate cathode materials. First, iron phosphate is loaded on graphene, and by controlling the pH adjustment time, small-particle-size FePO 4 / GO and large-particle-size FePO 4 / GO are accurately obtained. Iron phosphate is loaded on single-walled carbon nanotubes to prepare FePO 4 / SWCNT. Then, the loaded material and a lithium source are subjected to a pre-calcination reaction to grow and form graphene-coated lithium iron phosphate. Finally, dopamine is oxidized and self-polymerized to form polydopamine, which is coated on the outer layer of the graphene-coated lithium iron phosphate. After calcination and carbonization, a double coating of porous carbon material and graphene is formed. The particle size distribution of the prepared cathode material is optimized by using iron phosphate materials with different particle sizes and shapes to improve its tap density, and the conductivity is improved by graphene coating, endowing the cathode material with excellent electrochemical performance.

An electrical connection for a vehicle and methods of forming an electrical connection for a vehicle. The electrical connection includes a first electrical component including a first joining area. The electrical connection also includes a conductor including a second joining area. The conductor is joined at the second joining area to the first joining area of the first electrical component. In addition, the electrical connection includes a fusion zone formed in the first electrical component in the first joining area. The conductor includes a copper-graphene multilayer composite formed on the surface of the conductor, the composite including at least one of the following composite structures: a) alternating layers of graphene and copper deposited on the substrate, b) graphene particles dispersed in a copper matrix, and c) alternating layers of graphene and copper deposited on a copper foil, wherein the copper foil is wrapped around the substrate.

The invention provides a graphene heating ceramic substrate and a preparation method thereof, and the specific steps are as follows: S1, preparing an electrode on the surface of a ceramic substrate with the smoothness Ra less than 0.008 [mu] m to obtain a pretreated ceramic substrate; s2, coating the surface of the pretreated ceramic substrate with a graphene coating, drying and sintering to obtain a graphene heating ceramic substrate; the graphene coating is prepared by mixing graphene, a silane coupling agent, potassium silicate, silicone acrylic emulsion, sodium polyacrylate, a defoaming agent and a film-forming agent. The graphene coating is prepared through a novel method, the method is simple and easy to implement, the graphene coating has high binding force with the ceramic substrate with the pretreated surface, the preparation technology of the graphene heating ceramic substrate is simplified, the yield and heating efficiency are improved, and a safe and environment-friendly heating mode is achieved.

The utility model discloses a high temperature resistant casting which comprises a casting body, the casting body comprises a polypropylene coating layer, the outer surface of the polypropylene coating layer is coated with a graphene coating layer, the outer surface of the graphene coating layer is coated with an alkyd coating layer, the outer surface of the alkyd coating layer is coated with a boron nitride coating layer, and the outer surface of the boron nitride coating layer is coated with a boron nitride coating layer. And a heat-conducting fin is arranged on the inner wall of the casting body. Through the arrangement of the cooling fins, the heat conducting fins, the polypropylene coating layer, the graphene coating layer, the alkyd coating layer and the boron nitride coating layer, the problems that an existing casting is poor in high-temperature-resistant effect, the temperature of a casting material is too high, oxides and sulfides are likely to be easily formed at high temperature, the quality of the casting becomes poor, defects are formed, meanwhile, the temperature is too high, and the service life of the casting is prolonged are solved. Casting materials and mold materials can cause thermal wave stretching due to thermal expansion and cold contraction and the like, so that sintering and hot crack defects are caused, and the casting quality and the use effect are seriously influenced.

The invention relates to the technical field of electronic materials, and discloses a multi-layer shielding type insulating sheet, which comprises a shielding layer used for shielding electromagnetic interference and in direct contact with an insulating layer; the insulating layer is used for electric insulation and is tightly connected with the shielding layer and the heat dissipation layer; the heat dissipation layer is used for heat conduction and is arranged on the close side of the insulating layer and the buffer layer; the buffer layer is used for providing mechanical buffer and structural support and is attached to the heat dissipation layer and the surface coating; the surface coating is used for protecting the material surface and arranged on the outer surface of the buffer layer, and the shielding layer is made of one or more of copper foil, aluminum foil and a graphene coating. By adopting the copper foil, the aluminum foil or the graphene coating as the shielding layer, electromagnetic interference from the outside can be effectively shielded, in an experiment, the electromagnetic shielding effectiveness of the insulating sheet can reach 95 dB or above, the insulating sheet particularly shows excellent electromagnetic shielding performance in a high-temperature and high-vibration environment, and stable operation of an internal circuit and equipment is ensured.

A semiconductor device has a carrier. An electrical component is disposed over the carrier. An encapsulant is deposited over the electrical component. A conductive layer is formed over the encapsulant. The conductive layer is deposited as a plurality of graphene-coated metal balls in a matrix. The conductive layer is sintered by intensive pulsed light (IPL) irradiation.

The invention belongs to the field of conductive materials, and particularly relates to antioxidant low-temperature conductive paste and a preparation method thereof. The conductive powder comprises copper powder modified by a surfactant and a graphene coating layer coated on the surface of the copper powder modified by the surfactant. The conductive paste provided by the invention comprises the conductive powder provided by the invention. Compared with traditional conductive copper paste, the conductive paste is more stable. On one hand, the surface of the copper powder is modified, so that the surfaces of copper powder particles are coated with graphene more uniformly, continuous contact is formed among the conductive particles, the contact area is increased, and the conductivity of the whole conductive material is increased; and on the other hand, the surface of the copper powder in the conductive slurry is coated with the graphene, so that the copper powder can be prevented from being oxidized, the sintering and curing condition can be changed from a protective atmosphere to an air atmosphere, the cost is further reduced, and the application range of the conductive slurry is expanded.

The embodiment of the utility model provides a heat pump system. The heat pump system comprises an evaporator, a compressor and a condenser which are communicated in sequence. The evaporator absorbs heat in air to heat a medium, the compressor compresses the medium heated by the evaporator, and the compressed medium is subjected to heat exchange through the condenser; wherein the evaporator comprises an evaporator pipeline and fins arranged on the evaporator pipeline, and a first graphene coating is arranged on the outer surface of each fin; the condenser comprises a shell and a heat exchange tube set, the shell is provided with a containing cavity, the heat exchange tube set is arranged in the containing cavity, and a second graphene coating is arranged on the outer surface of the heat exchange tube set. The working efficiency of the heat pump system is improved.

The present disclosure provides a coated paper product comprising: —a paper or paperboard substrate: —a barrier coating, wherein the barrier coating comprises graphene and a polyolefin copolymer bearing carboxylic acid moieties, wherein the polyolefin copolymer bearing carboxylic acid moieties preferably is ethylene-acrylic acid copolymer (EAA) or ethylene-methacrylic-acid-copolymer (EMAA) or maleic acid ethylene copolymer (MAE), and wherein the graphene content in the barrier coating is 0.3-3 wt %. There is also provided a coated paper product comprising high surface area graphite flakes having an average particle size of 2-7 μm instead of the graphene.

The invention relates to the technical field of capacitors, in particular to a high-thermal-conductivity thin-film capacitor of a graphite material and a preparation method thereof, and the preparation method comprises the following steps: spraying a graphene dispersion liquid on the surface of a thin film, judging the conductive state of a coating, and adjusting winding parameters to control spraying equipment to move; judging whether the graphene layer is uniformly distributed or not, and checking the concentration of the dispersion liquid, or checking the actual layer thickness; the dispersion state of the graphene dispersion liquid is judged, the reason for uneven distribution of the graphene layer is determined, and the ultrasonic treatment duration or spraying parameters are adjusted; spraying parameters are adjusted according to whether the actual layer thickness meets the curing requirement or not, or drying and curing are conducted; determining the curing degree of the graphene coating, winding the film roll material into a capacitor core package, or carrying out thermal stability test on the capacitor core package, calling back the judgment standard of the conductive state of the coating and the distribution of the graphene layer, and adjusting the initial detection length; according to the invention, the working temperature of the capacitor is reduced by coating the high-thermal-conductivity graphene material.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

The invention relates to the technical field of lithium batteries, and discloses a three-dimensional structure graphene coated nano silicon negative electrode material and a preparation method thereof, a lithium ion battery negative electrode plate and a lithium ion battery. The negative electrode material comprises modified nano silicon and graphene oxide coating the modified nano silicon; the weight ratio of the modified nano silicon to the graphene oxide is (10-1): 1. The modified nano silicon with positive charges and the graphene oxide with negative charges generate electrostatic self-assembly, so that the nano silicon is fully coated with the graphene, volume expansion and cracking of the nano silicon and formation of a non-uniform SEI film can be effectively prevented, and the lithium ion battery containing the negative electrode material has improved cycle performance.

The present invention relates to the technical field of photovoltaic cables, and more specifically, to a cold-resistant and ice-resistant cable for photovoltaic power stations. The cable comprises a conductor layer, an elastic insulating layer, and a protective layer arranged from the inside out. The cable further comprises a buffer assembly, and the buffer assembly comprises a fixed part and a movable part. In the present invention, when ice particles contact the surface of the cable, the graphene coating deforms inward, so that the impact of the ice particles is transmitted through the graphene coating to the rubber membrane layer, and the rubber membrane layer then drives the movable rod to move into the insulating tube. During the movement, the rubber membrane layer itself squeezes the outer shielding layer and the inner insulating layer, causing the outer shielding layer and the inner insulating layer to undergo elastic deformation, and the movement of the movable rod drives the connecting ring to move downward, and then pulls the auxiliary elastic ropes on both sides through the connecting ring, causing the auxiliary elastic ropes to undergo elastic deformation, further eliminating the impact of the ice particles, thereby achieving force unloading treatment of the impact and avoiding damage to the cable cortex.

The utility model relates to a heater for an aerosol-forming substrate and an aerosol generating device.The heater for the aerosol-forming substrate comprises a first heating structure and a graphene coating, and a heating cavity used for containing the aerosol-forming substrate is formed in the first heating structure; the first heating structure is constructed to be capable of heating aerosol to form a substrate, a smoke outlet and a first air inlet which are both communicated with the heating cavity are formed in the first heating structure, and the graphene coating is located in the heating cavity and covers at least part of the cavity wall of the heating cavity. On one hand, the graphene coating can transmit heat of the first heating structure to the aerosol-forming substrate in a heat radiation mode, on the other hand, the graphene coating can reflect heat radiation from the interior of the heating cavity, and on the other hand, the graphene coating can also transmit heat to the aerosol-forming substrate in a heat conduction mode, so that the aerosol-forming substrate can be heated more effectively. This reduces heat transfer loss between the first heating structure and the aerosol-forming substrate.

The invention provides a superconducting copper piece and a preparation method thereof, and the method comprises the steps: placing a copper piece in a heating furnace, heating the copper piece under normal pressure until the surface of the copper piece is oxidized, and keeping the shape of the copper piece consistent before and after heating; the treated copper piece is placed in a tubular furnace reaction cavity, graphene grows on the surface of the copper piece through a chemical vapor deposition method, and the superconducting copper piece is obtained; wherein a carbon source used for graphene growth is a solid carbon source. According to the method, a low-temperature chemical vapor deposition method is utilized, in-situ chemical reaction is carried out on the surface of the copper piece on the premise that the morphology of the copper piece is not changed, and a 5-10 nm high-quality graphene coating is deposited. The ultrathin graphene coating is transparent in appearance, and the conductivity of the copper piece can be remarkably improved, so that the copper piece containing the graphene coating has lower impedance, higher strength and longer service life compared with an original copper piece in a large-current working scene.

The heating lamp comprises an outer frame and a glass plate arranged in the outer frame, the outer frame surrounds the outer side of the glass plate, an opening is formed in the inner side of the outer frame, the glass plate is located on the inner side of the outer frame, the bottom face of the glass plate is exposed outside through the opening, and a graphene coating is arranged on the top face of the glass plate. A first lamp strip is arranged in the outer frame, a light-transmitting hole corresponding to the side surface of the glass plate is formed in the side wall, close to the glass plate, of the outer frame, light emitted by the first lamp strip can be projected onto the glass plate through the light-transmitting hole, and a light-transmitting plate is arranged on the outer side of the outer frame; the graphene coating is arranged on the glass plate, so that the heating function is achieved, the glass plate has the advantages of being efficient in heating, energy-saving, environment-friendly and long in service life, the glass plate is matched with the first lamp strip and the light-transmitting hole in the outer frame to achieve light emitting and achieve the lighting function, and the first lamp strip is matched with the light-transmitting plate to enable the heating lamp to form atmosphere light when emitting light. The indoor environment is beautified, and the heating lamp is more attractive.

The invention discloses a composite resin material for packaging a fuel cell and a preparation method of the composite resin material. The composite resin comprises bisphenol F type epoxy resin, alicyclic epoxy resin, acrylate resin, a toughening agent, nano silicon dioxide particles, a long-chain aliphatic amine curing agent, an imidazole accelerant and graphene coating carbon fibers. Bisphenol F and alicyclic epoxy resin are compounded, acrylate resin is combined to form a rigid-flexible three-dimensional network matrix, nano-silica treated by a silane coupling agent is introduced to improve moisture resistance, and graphene coating carbon fibers with oxygen-containing groups on the surface are utilized to enhance interface bonding force. And a cross-linked network is regulated and controlled through the coordination of the long-chain fatty amine curing agent and the imidazole accelerant. The obtained composite resin has excellent temperature resistance, moisture resistance, mechanical properties and interface bonding strength, effectively solves the problem of performance degradation of a traditional packaging material in high-temperature, high-humidity and corrosive environments, and meets the strict use requirements of fuel cells.

The invention discloses a modified current collector and a preparation method and application thereof. On one hand, the modified current collector provided by the invention comprises an aluminum foil, the surface of the aluminum foil is coated with a graphene coating, and melt-blown fibers are arranged in the graphene coating; the graphene coating is prepared by curing graphene slurry, and the graphene slurry comprises the following components: a PVDF (Polyvinylidene Fluoride) emulsion grafted and modified by methacrylate, graphene and a solvent; the melt-blown fiber is of a three-dimensional network structure and is prepared from a polyaniline-carbon nanotube composite material. On the other hand, the invention further provides a preparation method and application of the modified current collector. The preparation cost is low, the binding strength of the carbon material coating and the aluminum foil is good, the coating is not prone to falling off, the charging and discharging temperature of the battery can be effectively reduced when the carbon material coating is applied to the lithium battery, and the cycle service life of the battery can be effectively prolonged.

Some embodiments of the present disclosure relate to a roofing material, wherein the roofing material may comprise a plurality of coated roofing granules, wherein each of the plurality of the coated roofing granules may comprise a roofing granule having an outer surface; and a granule coating, wherein the granule coating is disposed on at least a portion of the outer surface of the roofing granule, and wherein the granule coating comprises graphene. Some embodiments of the present disclosure relate to a roofing material, wherein the roofing material may further comprise a reflective base coating, wherein the reflective base coating is positioned between the outer surface of the roofing granule and the granule coating.

The invention discloses an intelligent high-safety lithium battery fault experiment device and a prediction control system. A four-layer composite protection cover and a multispectral monitoring window are integrated, and a three-dimensional safety barrier is formed from physical protection to real-time monitoring. The four layers of protective covers resist impact through the metal alloy layer, absorb energy through the honeycomb layer, insulate heat through the ceramic layer and uniformly dissipate heat through the graphene coating, so that thermal runaway diffusion is effectively inhibited; the multispectral monitoring window is combined with infrared thermal imaging and high-speed camera shooting, temperature abnormity and battery deformation are captured in real time, and accurate data support is provided for early warning. An LSTM model carried by the edge calculation unit predicts the thermal runaway risk 5-10 minutes ahead of time by fusing the temperature gradient, the gas concentration change and the voltage spectrum characteristics, triggers a grading response strategy, and forms a progressive active protection mechanism from sound-light alarm and liquid nitrogen directional cooling to millisecond power failure and aerosol fire extinguishing; and the device is suitable for electric vehicle battery packs and other complex scenes, and the scientific research practicability and industry universality of the device are remarkably improved.

A self-cooling overhead bare conductor relates to the technical field of power transmission equipment and structurally comprises a conductor substrate, a graphene coating used for radiating heat is arranged on a backlight surface of the conductor substrate, and the coverage range of the graphene coating in the circumferential direction of the conductor substrate is 120-180 degrees. The graphene coating is arranged in a segmented mode in the length direction of the wire base body, the length of each segment of the graphene coating is 5 / 3-2 times of the diameter of the wire base body, and the distance between every two adjacent segments of the graphene coating is 0.85-1 time of the diameter of the wire base body. Sand blasting treatment is carried out on the joint face of the wire base body and the graphene coating, the surface roughness is Ra3.2-6.3 microns, oxidation films and impurities on the surface of the wire base body are removed, the adhesive force of the graphene coating is enhanced, and the thickness of the graphene coating is 40-80 microns. According to the invention, the technical problem of current limiting caused by temperature rise of the wire can be solved.

The utility model discloses a diving fabric implanted with patterns. The diving fabric comprises a foamed chloroprene rubber sponge sheet, a graphene coating, a patch, a floral pattern layer and a titanium coating. The foamed chloroprene rubber sponge sheet subjected to compression treatment is used as a base material, the compressed sponge sheet is higher in apparent density, the internal hash molecular structure of the sponge sheet is tighter, the surface of the sponge sheet is smoother, printing materials such as printing ink can better permeate into the surface layer of the sponge sheet, and patterns and the sponge sheet are fused together; a layer of textile fabric does not need to be added between the floral patterns and the sponge sheet, the floral patterns can be better presented while environmental protection is achieved, and the service life of the floral patterns is prolonged. In addition, the titanium coating enables the floral patterns to be better in oxidation resistance and friction resistance, the floral patterns printed on the sponge sheet can be better protected, the corrosion resistance and abrasion resistance of the floral patterns in a seawater environment are improved, the service life of the floral patterns is prolonged, and the attractiveness of the floral patterns is improved.

The invention belongs to the field of plastic pipes, and discloses a chlorine-resistant polyethylene pipe and a preparation method thereof.The chlorine-resistant polyethylene pipe comprises a polyethylene resin layer serving as an outer layer and a modified graphene coating serving as an inner layer, and the modified graphene coating is a polyvinyl alcohol edge grafted modified graphene coating; and wherein at least a portion of the polyvinyl alcohol forms a crosslinked polyvinyl alcohol; in terms of the total mass of the modified graphene coating being 100%, the mass content of polyvinyl alcohol in the modified graphene coating is 3-30%, preferably 5-25%, and the mass content of graphene is 70-97%, preferably 75-95%. The modified graphene material is developed on the basis of a low-cost and easily-available graphite material through a graphene preparation technology with a simple process and controllable cost, and the modified graphene material is coated on the inner wall of the polyethylene pipe, so that the excellent chlorine resistance of the polyethylene pipe is realized.

A method for coating a metallic surface by a graphene layer by depositing a graphene molecular precursor comprising a compound having an aromatic hydrocarbon component that is derivatized by a tethering group. The tethering groups react with the metallic surface to form a covalent bond between the compound of the graphene molecular precursor and the non-metallic surface, and the graphene molecular precursor is transformed into a graphene interfacial layer which is covalently bound to the non-metallic surface.

The application discloses a graphene-diamond composite coating and a preparation method and application thereof, and belongs to the technical field of materials. The graphene-diamond composite coating comprises a diamond coating and a graphene coating; graphene sp2 bond structure is covalently combined with diamond sp3 bond structure; and the graphene coating has a graphene structure with non-parallel growth mainly in a vertical direction. The graphene-diamond composite coating has small lattice mismatch between the diamond and the graphene, avoids volume expansion caused in a friction heat process, and has the advantages that the diamond coating can provide a support layer for the graphene, forms super-strong C-C covalent bonds at an interface, and significantly improves the adhesion strength of the graphene; the graphene can avoid brittle fracture of the diamond, and significantly improves the lubricating performance of the surface of the diamond coating. The composite coating has better wear resistance, a low friction coefficient and excellent oxidation resistance, and can remain stable under high-temperature and high-load working conditions, so that the service life and processing efficiency of wear-resistant parts are improved.