2389 results about "Graphite" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention discloses a dry-type transformer. The dry-type transformer comprises a transformer body, a housing, a bottom plate and a fan, wherein the transformer body is formed by a plurality of groups of encapsulated windings in an array mode, a supporting rod is arranged at the bottom of the transformer body and allow the encapsulated windings in each group to connect with each other, the supporting rod is arranged in a crossed mode, and first threaded holes penetrate the supporting rod; the transformer body is integrally arranged in the cavity of the housing, and the bottom of the transformer body is fixedly positioned with the bottom plate, and meanwhile, the transformer body is arranged in the housing through the fan, the whole device achieves dispelling the heat in the transformerbody, and the graphite material of housing side is protruding simultaneously, and the heat from the housing is diffused quickly, and the protrusion of the array distribution can reduce the air great dust entering the inner wall of the housing through air vents.

This application provides a vapor chamber and an electronic device. The vapor chamber is formed by arranging, in a stacked manner, a plurality of graphite sheets made of graphite or graphene.

The invention relates to a method for fabricating a two-dimensional (2D) heterostructure comprising depositing graphene on a substrate in an ultrahigh vacuum (UHV) chamber at a first temperature and a first chamber pressure to form sub-monolayer graphene on the substrate; and subsequently depositing borophene onto the sub-monolayer graphene on the substrate in the UHV chamber at a second temperature and a second chamber pressure so as to couple the borophene with the graphene on the substrate to form a 2D borophene-graphene heterostructure comprising lateral and / or vertical heterostructures.

The utility model relates to a kind of drilling device for super-long graphite rod processing, including tool tip and the tool holder connected with tool tip. Tool tip is set to three-prism pyramid shape. Tool tip includes: first cutting edge, at least two first cutting edges are symmetrically arranged, and the edge of at least two first cutting edges forms first angle;Second cutting edge, at least four second cutting edges are axially symmetrically arranged, and the plane of at least two second cutting edges forms second angle with the plane of opposite at least two second cutting edges. Chip removal platform formed due to first angle and second angle not being identical is arranged between tool tip and tool holder. The utility model is set to three-prism pyramid shape tool tip, and adopts multi-angle cutting edge (with symmetrically arranged first cutting edge and axially symmetrically arranged second cutting edge), so that tool is more uniform in cutting process Stress, can effectively reduce cutting force and cutting torque, can further reduce cutting resistance and vibration, improve cutting efficiency and machining precision.

This invention relates to a method for remote epitaxial growth of single-crystal lead-free perovskite microsheets on germanium, comprising the following steps: using CsBr and SnBr2 as source materials placed in a reaction region, using argon as a carrier gas, placing germanium-based graphene in a deposition region, and then heating to react the source materials, followed by evaporation and deposition onto the germanium-based graphene to form single-crystal lead-free perovskite microsheets. The method of this invention can obtain perovskite microsheets with good orientation and is environmentally friendly. Furthermore, germanium is a mature semiconductor material with well-established wafer fabrication, cleaning, and surface treatment processes, making large-scale production possible and providing a new path for perovskite to move from the laboratory to high-performance, multifunctional integrated optoelectronic devices.

The application provides a graphite ladle production powder intelligent weighing and compensation control method, relates to the graphite product production control technical field, and comprises the following steps: obtaining target formula parameters, raw material state data and discharging process data corresponding to each powder raw material in a graphite ladle blank batching weighing process, the graphite ladle production powder intelligent weighing and compensation control method, by obtaining the target formula parameters, raw material state data and discharging process data corresponding to each powder raw material, generating a weighing compensation collaborative control index, forming self-adaptive weighing control parameters and self-adaptive compensation control parameters matched with each powder raw material, realizing the collaborative identification and self-adaptive regulation and control of the discharging behavior, deviation formation mechanism and compensation demand in the graphite ladle blank batching weighing process, and improving the control precision, process stability and control adaptability of the powder weighing process.

This utility model discloses an oil-free lubricated bearing plate, comprising a bimetallic plate composed of a base metal plate and a sintered metal plate. Graphite insertion holes are equidistantly distributed on the bimetallic plate. A first slot is equidistantly formed on the side of the base metal plate closest to the sintered metal plate, and a first locking strip is fixedly connected to the side of the sintered metal plate corresponding to the first slot. In the production of this utility model, the base metal plate is pre-processed to form the first slot and the second locking strip. Alloy powder is then spread evenly on the base metal plate, and the base metal plate and the sintered metal plate are bonded together through sintering. The pre-processed first slot and second locking strip ensure a tight bond between the base metal plate and the sintered metal plate, greatly enhancing the bonding strength and preventing cracks from appearing between them.

Battery cell characterized in that it comprises a stacked electrical core, wherein the stacked electrical core comprises a cathode foil and an anode foil, wherein the cathode foil comprises a cathode collector and a cathode film layer provided on at least one side of the cathode collector, wherein the cathode film layer comprises lithium-containing transition metal phosphate particles provided with a carbon material on at least part of a surface; wherein a median C50 of the degree of graphitization in the cumulative distribution curve for the graphitization C value of the cathode film layer, obtained in the area-scanning mode of the laser microconfocal Raman spectrometer, is 0.95–1.20; wherein the graphitization C value is IG / ID, where IG is the intensity of the G-peak of the Raman spectrum at 1580 ± 100 cm⁻¹ and IG is the intensity of the D-peak. of the Raman spectrum at 1350±100cm-1;where the density of the cathode foil when the battery cell is in a fully discharged state is 2.3 g / cm3-2.6 g / cm3;

This invention provides a demolding method for silicon carbide ceramic parts, belonging to the field of silicon carbide sintering and molding technology. The invention involves molding silicon carbide powder to obtain a silicon carbide green body; sintering the silicon carbide green body to obtain a silicon carbide sintered green body, the sintering being carried out in a graphite mold; and subjecting the silicon carbide sintered green body to sequential gradient cooling and natural demolding to obtain the silicon carbide ceramic part; the gradient cooling includes sequential high-temperature cooling, medium-temperature cooling, and low-temperature cooling. This invention provides a demolding method for silicon carbide ceramic parts that utilizes the difference in thermal expansion coefficients between graphite and silicon carbide. Through precise temperature control and gradient cooling, the radial shrinkage of the graphite mold is greater than that of the silicon carbide sintered green body, creating a gap between the graphite mold and the silicon carbide sintered green body, achieving non-destructive, automatic, and rapid separation without the need for external mechanical force, thus improving product yield and mold reuse rate.

The present invention broadly relates to the fabrication and processing of graphene electronic devices on silicon which comprise a silicon dioxide passivation layer.

An exemplary embodiment of the present invention can provide a method of manufacturing a graphene film, including preparing a substrate including a carbon layer in a chamber, and forming a graphene layer by forming plasma in the chamber and applying a positive voltage pulse to the substrate.

The application provides a take-up and pay-off device, a plasma enhanced chemical vapor deposition system and a graphene film preparation method. The take-up and pay-off device comprises a pay-off shaft, a take-up shaft, a base and a motor. The pay-off shaft is used for arranging a substrate; the take-up shaft is arranged in parallel with the pay-off shaft and is used for winding the graphene film and the substrate; the base is arranged below the pay-off shaft and the take-up shaft and is used for supporting the pay-off shaft and the take-up shaft; and the motor is connected with the take-up shaft and is used for providing power for the take-up shaft. Through the above design, the graphene film with a large width can be prepared, and the problem that the preparation of the large-size graphene film is limited at present is solved.

The application discloses a preparation method of a superlattice film. The method takes aramid nanofiber phase separation scraped film precursors as a starting point, and prepares a dense layered superlattice film through segmented carbonization and high-temperature graphitization. The method is simple in process and low in cost. The prepared superlattice film is few in defects and good in in-plane / out-of-plane thermal conductivity and other performances, and can be widely applied in the fields of heat dissipation materials and the like.

The invention relates to a graphene-based energy source used in heat meters located in independently heated or cooled spaces, where a graphene-based nano-composite is utilized instead of a battery. It generates electrical energy by leveraging the temperature difference between the heating water flowing through the meter and the ambient temperature, using the Seebeck effect of thermoelectricity. This innovation eliminates the need for batteries in heat meters by transforming the meter itself into a source of energy.

The application discloses a method for preparing niobium carbide from aluminum niobium slag by fire reduction recovery. The method comprises the following steps: taking aluminum niobium slag, graphite powder and fluorite according to the mass ratio of 100:6-12:3-8, mixing them uniformly to obtain a mixture; loading the mixture into an electric arc furnace preheated to 700-900 DEG C and into which a protective gas is introduced, heating to 1750-2050 DEG C and keeping constant temperature for 2-4 hours, and then discharging aluminum slag mixture and niobium carbide alloy ingot after layering; crushing the niobium carbide alloy ingot, adding it into an alkaline solution according to the solid-liquid ratio of 1g:8-12ml, heating to 80-100 DEG C and stirring for 2-4 hours, filtering and washing with water until pH=7-8 while hot after the reaction, and then performing acid washing and drying. The application has wide raw material adaptation range, high niobium recovery rate and product purity, and obvious cost advantage.

The application discloses a graphene acceleration sensor with a ladder beam structure and belongs to the technical field of acceleration sensors. The graphene acceleration sensor comprises a support frame, a cross-shaped mass block, a substrate, ladder-shaped cantilever beams, graphene pressure-sensitive resistors, protective films, metal electrodes and metal pads. The cross-shaped mass block is located in the middle of the support frame, and each inner side wall of the support frame is connected with the cross-shaped mass block through a ladder-shaped cantilever beam. The substrate is bonded to the bottom of the support frame. Each ladder-shaped cantilever beam is a variable cross-section beam, which decreases from the cross-shaped mass block to the support frame. Each graphene pressure-sensitive resistor is arranged on each ladder-shaped cantilever beam, and each protective film covers the upper surface of each graphene pressure-sensitive resistor. The graphene acceleration sensor has a wide-range measurement range of 50000g, the sensitivity is improved by 36.11%, and the graphene acceleration sensor has excellent wide-range and high-sensitivity characteristics and significantly reduces the influence on the cross-axis sensitivity.

The application discloses a kind of modular thermal battery energy storage devices based on biochar and preparation method thereof.The device includes heat preservation shell, biochar-based composite heat storage core, electric heating system, heat exchange release system and optional thermal photovoltaic (TPV) power generation unit.The heat storage core is made of biochar from agricultural and forestry waste by low-temperature pyrolysis, crushing, and compounding with graphite powder and silicon carbide particles, then high-temperature graphitization treatment is carried out, which can store heat at 1500℃-2200℃ for a long time, the mass loss rate is less than 0.5% at 1800℃ for 100 hours, and the thermal conductivity is not less than 8 W / (m·K).The application uses biochar, which is cheap and has carbon negative characteristics, to replace traditional graphite heat storage medium, significantly reducing material cost and life cycle carbon footprint, and realizing rapid deployment through modular design, suitable for industrial high-temperature steam, drying, chemical reaction and other scenes of heat energy storage and release, and can realize combined with TPV unit to realize heat and power supply.

This invention relates to the field of functional materials technology, and particularly to a floating defective g-C3N4 / PDI composite thin-film photocatalyst, its preparation method, and its application. The preparation method of the floating defective g-C3N4 / PDI composite thin-film photocatalyst provided by this invention includes the following steps: mixing defective graphene carbon nitride, N,N'-bis(3-aminopropyl)perylene-3,4,9,10-tetracarboxylic acid diimide (PDI), an organic base, and water to obtain a first suspension; mixing the first suspension with a monohaloacetic acid to undergo a protonation reaction, followed by solid-liquid separation to obtain a protonated composite material; mixing the protonated composite material with a thermoplastic resin solution to obtain a second suspension; and forming the second suspension into a film and then drying it to obtain the floating defective g-C3N4 / PDI composite thin-film photocatalyst. This photocatalyst is recyclable after use, does not cause secondary pollution to the environment, and exhibits excellent photocatalytic performance.

The utility model relates to the technical field of graphene heating sheet, especially a superimposed heat conduction structure of graphene heating sheet, including mounting plate, base layer board, heating sheet, graphene board, mounting sleeve and plug rod, four mounting plates all are provided with base layer board, heating sheet is provided on base layer board, graphene board is provided on heating sheet, four mounting sleeves are fixedly connected on mounting plate, four plug rods are fixedly connected on mounting plate, four plug rods are inserted into four mounting sleeves on the mounting plate below, when the clamping block moves down and is extruded by the first fixed block on the mounting plate below, the clamping block drives the sliding rod to move outward, when the clamping block moves to the recess position of the first fixed block, the elastic member rebounds and drives the sliding rod and the clamping block to move inward and clamps into the recess of the first fixed block, so that two mounting plates are fixed together quickly, and the effect that convenient to disassemble and assemble is achieved, thereby being convenient for maintenance and replacement.

The application discloses a preparation method of a graphene / hexagonal boron nitride heterojunction. The target substrate is subjected to cleaning treatment, and then the surface of the cleaned target substrate is changed into hydrophilicity, so that the film can be well laid on the surface of the substrate, and the wrinkles are reduced. A layer of hexagonal boron nitride is arranged on the surface of the hydrophilic target substrate. A layer of PMMA is spin-coated on the surface of the graphene film to be transferred, and then the graphene film is floated in deionized water. Under the surface force of the deionized water, the graphene film can be stretched based on the PMMA. Then, the target substrate with the surface provided with the hexagonal boron nitride is used to be combined with the graphene film with the PMMA layer spin-coated on the surface in the deionized water, so that the target substrate and the graphene film are combined flatly. Then, drying and heating are carried out at a stepped temperature, the distance between the substrate and the sample is shortened, and the crack area is reduced. Finally, through annealing treatment, not only the PMMA residue is reduced, but also the film can be more closely contacted with the substrate.

This invention belongs to the field of oilfield chemical technology and discloses a surface-modified ultrafine graphite-based drilling fluid extreme pressure lubricant and its preparation method. The extreme pressure lubricant comprises a base oil, a long-chain fatty acid ester oiliness agent, a liquid extreme pressure agent, a surface-modified solid extreme pressure agent, a rheology modifier, and an emulsifier. The surface-modified solid extreme pressure agent is prepared by using ultrafine graphite powder as a matrix, undergoing a first modification with sulfurized oleic acid polyethylene glycol ester, and a second modification with an oil-soluble dispersant. This invention utilizes the non-degradable nature of modified graphite at high temperatures, combined with a liquid extreme pressure agent, to form a high-strength composite reactive film at the high-temperature friction interface through a carbon-sulfur-boron synergistic effect. Under the triple synergistic lubrication mechanism of the oil film, the chemically reactive extreme pressure film, and the solid lubricating film, the technical problem of easy demulsification and lubrication failure of traditional lubricants in environments with 200℃ high temperature and 36% saturated salt water is effectively solved.

1. The name of the design product: air-cooled battery graphite pole plate. 2. The use of the design product: conductive carrier for flow battery. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

This invention relates to a graphene spin device, its construction method, and a method for measuring nonlocal signals. The construction method of the graphene spin device includes the step of setting electrodes on the graphene surface; wherein, the electrodes are set by magnetron sputtering, using a direct current, and the magnetron sputtering power is 200±10W. This invention creates defects at the contact point between the graphene and the electrodes through magnetron sputtering under specific conditions, forming serrated graphene edges. Then, it utilizes the unique magnetism of graphene to construct a spin device. This spin device has high spin polarization and long spin transport distance. More importantly, this spin device relies solely on the magnetism of the graphene itself for spin injection and spin detection, providing a new approach for the development of graphene spin devices. It can be used for nonlocal measurements at room temperature, has low requirements for experimental environmental conditions, and is beneficial for exploring some nontrivial electrical mechanisms.

This application relates to the technical field of powder metallurgy, specifically to a high-chromium-content chromium-aluminum target and its preparation method. The atomic percentage content of each element is: Cr 60-80 at%, with Al as the balance. The preparation method includes: uniformly mixing chromium powder and aluminum powder using zirconia balls to obtain a chromium-aluminum mixed powder; loading the obtained chromium-aluminum mixed powder into a rubber sleeve, sealing it after vacuuming, and performing cold isostatic pressing to obtain a chromium-aluminum billet; loading the obtained chromium-aluminum billet into a graphite mold, vacuuming, and heating for pre-sintering; continuing to heat while applying axial pressure for spark plasma sintering; cooling the sintered billet to room temperature in the furnace, demolding, and machining to obtain the high-chromium-content chromium-aluminum target. The preparation method provided by this application can effectively suppress component segregation, significantly improve the density and compositional uniformity of the target material, and has a short production cycle and low cost, making it suitable for the large-scale production of high-chromium-content chromium-aluminum targets.

The invention discloses a sealing method for an optical fiber element, and relates to the technical field of optical element connection, in the sealing method, a pretreated assembly component is directly sealed under micro-positive pressure inert gas, and the sealing reliability can be improved from multiple aspects of oxidation prevention, atmosphere control, quality improvement, process stabilization and the like; the temperature of the graphite jig changes more gently in the heating and cooling stages, heat permeates uniformly in the heating process, and local thermal shock is avoided; and during cooling, heat is quickly and uniformly dissipated, so that the cooling rate difference of all parts of the sealing piece is reduced, and thermal stress accumulation is greatly reduced. In the sealing heating stage, the graphite jig can quickly and uniformly conduct heat of a heat source, the problem that a local area is overheated or heated insufficiently can be avoided, it is guaranteed that glass solder is synchronously melted and wetted on the whole sealing interface, the defects that the solder is uneven in spreading, local fusion is incomplete and the like due to the temperature gradient are overcome, and the service life of the glass solder is prolonged. And the air tightness and the structural integrity of a sealing interface are ensured.

This invention belongs to the field of fuel cell technology, specifically relating to a metal-ceramic material for bipolar plates in proton exchange membrane fuel cells and its preparation method. The metal-ceramic material is a Ta-doped modified niobium-aluminum-carbon material, and the chemical formula of the modified niobium-aluminum-carbon is (Nb... 1‑ x Ta x 2AlC. The modified niobium aluminum carbon material prepared by this invention possesses the excellent properties of both metals and ceramics. This ceramic material exhibits excellent electrical and thermal conductivity at room temperature, a high elastic modulus, and a certain degree of ductility at room temperature, allowing it to be machined like metals and graphite. Simultaneously, it possesses the characteristics of ceramic materials, exhibiting high yield strength, high melting point, high thermal stability, and excellent corrosion resistance. Furthermore, the solid solution doping of Ta at the Nb position of the niobium aluminum carbon material significantly improves the corrosion resistance of the niobium aluminum carbon bulk, enabling it to operate stably in the PFMFC working environment.

The utility model relates to lithium battery recycling technical field especially, and more particularly to a kind of material sorting device of lithium battery disassembly.The utility model provides a kind of material sorting device of lithium battery disassembly, which is convenient to automatically collect cleaned electrode sheet and graphite powder, without manual operation, saves manpower and improves sorting efficiency.A kind of material sorting device of lithium battery disassembly, including ultrasonic cleaner, fishing net and guide column etc., the rear part of ultrasonic cleaner is connected with two guide columns left and right, and fishing net is sleeved between guide columns.The utility model is reversed to start motor to take up line after washing, so that fishing net moves upward, and when moving to the bending part of guide column, fishing net will rotate to ninety degrees to throw cleaned electrode sheet into collection box, achieving the effect of being convenient to automatically collect cleaned electrode sheet and graphite powder, without manual operation, saves manpower and improves sorting efficiency.

To provide a high-density carbon material, or a carbon material with controlled density, while being a graphene mesosponge. Also, to provide an electric double-layer capacitor with high energy density per unit volume. [Solution] A method for manufacturing a carbon material, comprising: a composite formation step of forming a carbon layer on the surface of a mold material by chemical vapor deposition using a carbon-containing raw material gas to obtain a carbon layer coated mold material; a mold material removal step of removing the mold material and isolating the carbon material by contacting the carbon layer coated mold material with an acid that dissolves the mold material; an impregnation step of impregnating the carbon material with a shrinking liquid; and a drying shrinkage step of drying and shrinking the carbon material impregnated with the shrinking liquid; and an electric double layer capacitor suitable for manufacture using this manufacturing method.

This invention provides a method for identifying surface defects in graphite bipolar plates, belonging to the field of defect detection technology in computer vision. First, it collects and standardizes multi-source heterogeneous image data of aligned flow channels to construct a physically consistent benchmark dataset that excludes environmental noise. Then, based on a self-supervised encoder-decoder architecture, it builds a graphite surface topology repair and reconstruction model. By using masked image modeling, the network learns prior knowledge of flow channel distribution and micro-texture, and a dynamic feature enhancement module repairs missing information in masked areas. Subsequently, it performs residual analysis on the reconstructed reference image and the actual observation image, constructing a defect discrimination feedback loop using pixel-level comparison and structural similarity measurement. This accurately identifies key defect indicators such as microcracks, edge chipping, and scratches without a standard physical template. Finally, it completes defect classification and localization through connected component quantization features, decoupling the residual mapping map into quantifiable geometric parameters, effectively reducing the false alarm rate and improving the level of detection intelligence.