115 results about "Graphite" patented technology

The invention provides a high-tenacity polycrystalline composite material. The high-tenacity polycrystalline composite material particularly comprises, by mass, 72%-92% of polycrystalline super-hard phase, 7.5%-25% of binding agents and 0.5%-15% of toughening agents. The toughening agents are one of aluminum oxide whiskers, silicon nitride whiskers, silicon carbide whiskers, carbon nano tubes and graphene or the combination of several of the aluminum oxide whiskers, the silicon nitride whiskers, the silicon carbide whiskers, the carbon nano tubes and the graphene. The invention further provides a high-tenacity polycrystalline blade prepared from the high-tenacity polycrystalline composite material and a preparation method of the high-tenacity polycrystalline blade. The preparation method comprises the steps of isostatic forming, vacuum heat treatment activation, and high-temperature and high-pressure sintering. The high-tenacity polycrystalline blade has good tenacity and cutting performance, and the preparation technique is simple and easy to implement.

A spray casting-suction casing apparatus for preparing great non-crystal alloy block is composed of upper and lower furnace chambers, water-cooled partition between said chambers, heating body consisting of one Mo sheet layer and 6 reflecting screen layers, mould made of quartz glass or graphite arranged in said heating body and passing through said partition, U-shaped seals, plug pulling unit for the quartz glass (or graphit) plug of the circular hole on the bottom of mould, and water-cooled copper mould made of red copper.

The invention relates to a stainless steel plate 8K mirror surface processing method, which is characterized in that the method comprises the following steps of: 1) water washing: cleaning sundries on the surface of a stainless steel plate; 2) rough polishing: polishing the surface of the stainless steel plate by using a rough polishing abrasive tool, i.e. a graphite wheel till the surface is evenly treated and is free of pocking marks, wherein the polishing gap is half of diameter of the polishing wheel; 3) precise polishing: precise polishing the surface of the stainless steel plate by using a precise polishing abrasive tool, i.e. a wool felt, in combination with polishing solution till the surface is free of wheel knurls and fine scratches and is uniform; 4) water washing and drying: washing the stainless steel plate with water and blow-drying the stainless steel plate by using a dryer; and 5) film sticking: sticking a film by using a stainless steel plate film sticking machine. By using the stainless steel plate 8K mirror surface processing method, the surface of a stainless steel plate production can be polished to an 8K mirror surface from a 2B or rougher surface, the mirror surface is bright, gorgeous, attractive and generous, and the processed product satisfies the requirements in SN/T1671-2005 Rules for Inspection of Surface Quality of Stainless Steel Decoration Sheets for Export.

The invention discloses an antistatic polyfluortetraethylene film and a preparation method thereof, the method comprises the steps of: at first, utilizing 100 parts of polyfluortetraethylene powders and 1-20 parts of an antistatic agent to be admixed in a high-speed agitator, wherein, such an antistatic agent is a composite antistatic agent consisting of acetylene carbon black, graphite, metal conductive powders and the like; then preparing an antistatic polyfluortetraethylene film by means of mixing raw materials, prepressing and performing, sintering at high temperature, film forming by turning, trimming, winding and the like. The antistatic polyfluortetraethylene film prepared according to the invention has a permanent antistatic effect and can sufficiently dissipate the charges accumulated on the surface thereof owing to friction, the added antistatic agent powders can also cooperate and reinforce therewith to a certain extent, thus overcoming the characteristics of inferior abrasive resistance and low hardness, and improving the mechanical performance of the polyfluortetraethylene.

A composite flow field element, such as a separator plate used in a high temperature air-cooled fuel cell assembly, preferably includes a metal sheet substrate of non-uniform thickness, such as a mesh, and flexible graphite layers bonded to the metal mesh substrate by an electrically conductive bonding agent.

The invention relates to high-performance graphitized free cutting steel for machining construction members. The high-performance graphitized free cutting steel comprises the following components in percentage by weight: 0.1-1.5% of C, 0.5-2.5% of Si, 0.05-2.0% of Al, not more than 1.0% of Mn, not more than 0.020% of P, not more than 0.02% of S and the balance of Fe and inevitable impurities, and simultaneously, the sum of Si and Al is 1.0-4.0%. In the invention, the graphitization time is not more than 5 hours, therefore, the production efficiency is greatly improved, and C in the steel can be converted into graphite within the time period; and moreover, graphite granules have small size and are evenly distributed, and the high-performance graphitized free cutting steel does not contain harmful elements to the environment and has the advantages of good cutting performance, cold molding and high fatigue strength.

The invention relates to a method for recycling gold and copper from copper-containing oxidization gold ores, belonging to the technical field of wet-process metallurgy. The method comprises the following steps: firstly, carrying out ore-grinding and pulping onto the copper-containing oxidization gold ores, regulating the pH value by using an alkaline regulating agent in serous fluid and adding a leaching agent; with a titanium-based iridium-coated ruthenium coating electrode, stainless steel or lead alloy as an anode and a graphite plate, a stainless steel plate, a titanium plate or a carbon fiber as a cathode, carrying out leaching-electrodeposition at the current density of 50 A/m<2>-200 A/m<2> under the normal temperature, wherein most of gold and part of copper in the leached-electrodeposited ores are leached out and gathered on the cathode by in-situ electrodeposition reduction; and taking out the cathode plate which is gathered with gold and copper valuable metals as an electrodeposition anode, and carrying out electrodeposition in an electrolytic cell with sulfuric acid, so that anode dissolution-cathode electrodeposition is carried onto the gathered copper, and single-substance gold is collected in the form of anode mud. The method disclosed by the invention has the characteristics of being gentle in reaction condition, simple in process method, short in process flow, low in production cost, energy-saving and synergistic, environment-friendly and the like.

The present invention provides a photocatalyst composite structure and a preparation method thereof. The photocatalyst composite structure has backbone-branch structural feature; the graphite type carbon nitride (g-C3N4) is the backbone, and carbon nanotubes(CNTs) grown in situ on the backbone chemical through vapor deposition (CVD) are the branches; and the nano photocatalyst coats on the entire backbone-branch complex structure surface. The invention has the advantages that the photocatalyst composite structure can degrade organic contaminants and realize photocatalytic water decomposition for hydrogen production under ultraviolet and visible light; in addition, the backbone-branch composite structure has large specific surface area, and can fully contact with organic pollutants and electrolyte solution to improve the photocatalytic efficiency.

The invention relates to a graphite negative electrode material of a low-temperature lithium ion battery and a preparation method thereof. The graphite negative electrode material of the low-temperature lithium ion battery comprises graphite and a fast ion conductor coated on the graphite surface; The oxidation-reduction potential of the fast ionic conductor is higher than that of graphite. The preparation method comprises the following steps of: wet ball milling the original graphite powder, drying the mixed liquid into powder by a spray dryer to obtain graphite powder with smaller particle size, intercalating the graphite powder, coating the surface of the graphite powder, and obtaining graphite negative electrode material for low-temperature lithium ion batteries. As in that anode material structure, particle size of the graphite can be controlled, diffusion distance of lithium ion is shorten, graphite interlayer spacing is increased after intercalation, that ion diffusion ability of the electrode material at low temperature can be obviously improved, the integral conductivity can be improved by intercalated metal or highly conductive substance between graphite layers, and a stable and uniform SEI film can be formed by coating a fast ionic conductor on the graphite surface, the lithium ion diffusion ability can be improved, and the interface property at low temperature can be improved. This material can also be used as an ideal cathode material for sodium ion batteries and high performance supercapacitor materials.

The invention discloses a processing method of a seed crystal with a big drift angle. The method comprises the following steps: selecting a relatively complete horizontal gallium arsenide monocrystal ingot with good electrical parameters, determining (111) crystal face on a head of the monocrystal ingot, determining a drift angle value on the crystal face according to crystallographic direction requirement, diffracting with (331) diffraction angle, cutting out monocrystal blocks according to needed length, bonding the cut monocrystal segments with crystal head upward to a graphite plate with bottom fixedly bonded with metal blocks, orientating the drift angle of the (221) crystal face after the bonding, diffracting with the (331) diffraction angle, rotating the monocrystal blocks for 90 degrees after cutting according to needed height, cutting the needed width when the drift angle of the (110) crystal face is determined zero degree, and then cleaning. The method can help solve difficulty of processing the seed crystal with big drift angle, and has simple, accurate and rapid advantages.

The invention provides a lithium ion secondary cell cathode and a cell. The lithium ion secondary cell cathode comprises a conductive agent, graphite, a caking agent and a current collecting body; the graphite is formed by mixing first graphite and second graphite by weight percentage of 5-30 to 95-70; the average particle diameter of the first graphite is between 0.5 and 2 mu m; the average particle diameter of the second graphite is between 4 and 12 mu m, wherein the graphite is coated-type graphite coated with a coating agent; and the coating agent is 1 to 20 weight percent of gross weight of the graphite. The average particle diameter of the first coated-type graphite is between 0.8 and 2.3 mu m; and the average particle diameter of the second coated-type graphite is between 5 and 13 mu m. The provided cathode has excellent large-current discharging performance and is in particular suitable for application of a power cell.

The invention discloses an aluminum plastic plate flame-retardant core layer and an aluminum-plastic plate, and belongs to the technical field of building fireproof materials, wherein the aluminum plastic plate flame-retardant core layer comprises, by weight, 30-50 parts of a matrix resin, 30-40 parts of a flame retardant agent, 0.5-1.5 parts of a flame retardant synergist, 1-2 parts of an anionicsurfactant, 2-4 parts of a compatibilizer, 1-2 parts of an antioxidant, and 0.5-1.5 parts of an antibacterial agent, wherein the matrix resin comprises low density polyethylene, polypropylene, an ethylene-octene copolymer and ethylene-ethyl acrylate according to a weight ratio of 6:2:1:1, and the flame retardant agent comprises magnesium hydroxide and expandable graphite according to a weight ratio of 6:1. According to the present invention, the prepared core layer has good mechanical property, can meet the requirements of the flame retardant B1 grade, and further has antibacterial property;and the aluminum plastic plate prepared from the flame retardant core layer has the good performances of the core layer, and further has the peel strength meeting the standard value.

The invention relates to the technical field of recovering silicon materials and removing impurities, in particular to a method for removing impurities of graphitic polysilicon materials growing in a reducing furnace. The invention aims to provide a method for cleaning graphitic silicon materials and has goals of conveniently removing graphitic impurities in the silicon materials and having less silicon wastage. The method for cleaning graphitic silicon materials has simple operation, can effectively remove graphite in the silicon materials, reduce the loss of the silicon materials and greatly increase the success ratio for growing single crystals by using a czochralski method.

The invention provides a preparation method of a paper-graphite-CoPd thin film electrode. The preparation method comprises the following steps: (1) uniformly coating ordinary paper with a mixture of graphite and clay; (2) retaining the paper coated with the graphite for 20-30 min under the voltage of 1.0V, activating the coating graphite, and then performing electro-deposition on Co for 120-150 min under the voltage of -0.8V to obtain a paper-graphite-Co thin film electrode; and (3) enabling the paper-graphite-Co thin film electrode to stand in 0.8 mmol/L<-1> of PbC12 solution for 1-3 min to obtain the paper-graphite-CoPd thin film electrode, namely a graphite coated paper loading CoPd catalyst. According to the method, with pencil coated paper, Co is subjected to electro-deposition on the surface of conducting paper coated with graphite, and then partial Co is replaced with Pd to prepare the graphite coated paper loading CoPd catalyst, so that the electroreduction performance of hydrogen peroxide is improved. The preparation method overcomes the defects of high current collector cost, hydrogen peroxide decomposition and the like, and solves the problem that hydrogen peroxide based full cells are bad in cathode activity.

The invention belongs to the field of anticorrosive paint, and particularly relates to a preparation method of an attapulgite-carbon nitride-polyaniline composite material and anticorrosive paint containing the composite material.The anticorrosive paint is prepared through the steps that one-dimensional attapulgite and two-dimensional graphite-phase carbon nitride are taken as a composite nuclear body material, aniline is polymerized on the surface of the composite nuclear body material to prepare attapulgite-carbon nitride-polyaniline composite anticorrosive packing, and then the attapulgite-carbon nitride-polyaniline composite anticorrosive packing is mixed with polyurethane, a coloring pigment, packing, a dispersing agent, a flatting agent, a defoaming agent and water to prepare the anticorrosive paint.The attapulgite-carbon nitride-polyaniline composite material is applied to the anticorrosive paint and has the multiple effects of preventing electrochemical corrosion and physical corrosion, enhancing the mechanical performance of a coating and the like.

The invention discloses a preparation method of a dual-scale titanium alloy material. The preparation method comprises the following steps that titanium alloy powder as the raw materials is subjected to low-temperature ball-milling, and fine-grain titanium alloy powder is obtained; the fine-grain titanium alloy powder and the titanium alloy powder as the raw materials are mixed, and the fine-grain titanium alloy powder in the mixed powder accounts for 5-95 wt%; and the mixed powder is subjected to degassing in a premade graphite mould, the degassed mixed powder is sequentially subjected to surface activation and discharge plasma activated sintering (PAS), and the dual-scale titanium alloy material is obtained. The production process is concise, short in period and high in structure controllability, and the compactness and mechanical property of the titanium alloy material can be effectively improved; and in the obtained dual-scale dual-phase titanium alloy material, dual-scale crystal grains are evenly distributed, the comprehensive mechanical performance is excellent, majority of industrial requirements are met, and the preparation method capable of achieving the industrially applied dual-scale titanium alloy material is provided.

A production method for a sintered valve guide includes preparing a raw powder which is primarily made of an iron powder and which includes at least a copper alloy powder and a graphite powder. The production method further includes compacting the raw powder into a green compact having an approximately cylindrical shape and sintering the green compact at 950 to 1050° C. The iron powder includes particles, which do not pass through a sieve of 240 mesh, at not less than 40 mass %, and not less than 70 mass % of the powder particles have not more than 0.5 of degree of circularity.

The invention discloses a dual-pulse solid rocket engine soft interlayer ablation test device comprising an end combustion powder charging cavity, a test piece ablation cavity, a spray pipe cavity anda center cube connector (5). The end combustion powder charging cavity and the test piece ablation cavity are symmetrically installed at the two ends of a through hole of the center cube connector (5). The spray pipe cavity is connected with the third hole of the center cube connector (5). An end combustion powder charging cavity blocking cap (1), an end combustion powder charging cavity shell (2), the center cube connector (5), a spray pipe cavity shell (6), a spray pipe cavity rear section (9), a test piece ablation cavity shell (11) and a test piece ablation cavity blocking cap (14) of thetest device are all made of high-strength 45 steel material. An end combustion powder charging cavity liner (3), a spray pipe cavity liner (7), a spray pipe cavity rear section liner (10) and a testpiece ablation cavity liner (12) are all made of ethylene propylene terpolymer material. A spray pipe cavity throat liner (8) is made of graphite. Through the dual-pulse solid rocket engine soft interlayer ablation test device, the problems that the work process of a dual-pulse engine ii pulse soft interlayer is difficult to simulate and observe are solved.

The invention discloses a high-sensitivity detection method of normal-temperature normal-pressure surface assisted laser desorption mass spectrometry, and belongs to the technical field of mass spectrometry. The invention adopts graphite as an energy conducting material in an ionization process, and a laser desorption plasma ionization mass spectrometric device is used for the detection of various micromolecular compounds. Compared with the prior art, the invention has high detection sensitivity.

The invention provides a two-section system and method for coproducing coal-base graphite and carbon nano-tubes. The system comprises a graphitization module and a carbon nano-tube generation module,wherein the graphitization module comprises a graphitization reactor, a volatile component outlet is formed in the top wall of the graphitization reactor, and a carrier gas inlet is formed in the bottom wall of the graphitization reactor; the carbon nano-tube generation module comprises a reforming reactor, a waste gas outlet is formed in the top wall of the reforming reactor, and a volatile component inlet and a water vapor inlet are formed in the bottom wall of the reforming reactor; upper and lower sieve plates are arranged in the graphitization reactor and the reforming reactor, respectively, and feeding holes and discharging holes are formed in the side walls of the graphitization reactor and the reforming reactor; and the volatile component outlet and the volatile component inlet arecommunicated through a middle pipeline. The system has the beneficial effects that aiming at the deficiencies that the energy consumption of high-temperature graphitization of coal is high and volatile components in the graphitization process are not effectively utilized in the prior art, a reaction for catalyzing graphitization and a reaction for catalyzing reforming to prepare carbon nano-tubesare effectively combined, so that the gradient utilization of coal resource is realized, and the high value-added product is obtained.

The invention relates to a preparation method of a graphite sheet surface chemical plating iron-nickel alloy layer. The preparation method comprises the following steps of 1, carrying out degreasing treatment on a graphite sheet; 2, carrying out oxidation treatment on the graphite sheet subjected to degreasing treatment; 3, carrying out the following sensitized treatment on the graphite sheet by utilizing a stannous chloride solution; 4, carrying out activating treatment on the graphite sheet by utilizing a palladium chloride solution; 5, sequentially adding 8-10 parts of C6H5Na3O7.2H2O powder, 4-5 parts of NH4Cl2 powder, 3-6 parts of FeSO4.7H2O powder, 2-3 parts of NiSO4.6H2O powder and 2-4 parts of NaH2PO2.H2O powder into ultra-pure water according to the mass ratio so as to fully dissolve the powder, adopting a NaOH aqueous solution as a pH adjustment solution, and dropwise adding the pH adjustment solution with the pH being controlled in a range of 9-9.5 to prepare a plating solution for surface chemical plating of the graphite sheet; 6, carrying out chemical plating treatment on the graphite sheet subjected to preliminary treatment. The preparation method is convenient in manufacturing and simple in process, and a compact and uniform plating layer with controllable thickness can be obtained on the surface of the graphite sheet.

The invention relates to a multi-quantum well photovoltaic battery based on a nanometer graphite electron transmission layer, and a preparation method thereof. The battery comprises a front electrode, an anti-reflection layer, N-type silicon, P-type silicon and a back electrode, wherein a composite layer composed of graphite and semiconductor quantum dots is arranged between the anti-reflection layer and the N-type silicon. Compared to the prior art, the method is characterized in such a way that a sol method is employed, first of all, a semiconductor quantum dot colloid is prepared; under the effect of a surfactant, the graphite is uniformly dispersed to the colloid, and then, by taking the graphite as a crystal growth liquid, a uniform an ordered electron transmission layer and a semiconductor quantum dot layer are grown on the surface of a crystal silicon chip in a deposition mode. According to the invention, by use of a quantum dot impact ionization effect and a namometer effect and excellent electron separate transmission performance of nanometer graphite, the minority carrier life and the quantum efficiency of the photovoltaic battery are improved, and the nanometer graphite can improve separation and collection of electrons by the silicon solar battery, improves photoelectric currents and accordingly improve the conversion efficiency of the silicon solar battery.

The invention relates to a preparation method of pearlescent anti-crease waterproof moisture-permeable polyurethane synthetic leather. The preparation method comprises the steps: weighing raw materials of a surface layer, mixing activated carbon, nitrocellulose, a dried color material, a pearl powder and colored plastic particles, then grinding, adding a proper amount of an acetic acid solution and polyurethane, adjusting the pH to be neutral, carrying out freeze drying, then grinding, adding the remaining raw materials, and stirring, to obtain a surface layer slurry; evenly coating release paper with the surface layer slurry, and drying to form a surface layer; weighing raw materials of a middle layer, mixing expanded graphite, quartz sand, magnesium oxide and aluminum hydroxide, then calcining the mixture, adding a stripping agent BYK-325, then treating for 1-2 h, cooling, then adding boric acid and wood powder, grinding, adding the remaining raw materials, and stirring to obtain a foaming layer slurry; mechanically foaming the prepared foaming layer slurry, then evenly coating the surface layer with the foamed foaming layer slurry, and drying; coating the foaming layer with a water-based polyurethane adhesive slurry, bonding with a base cloth layer, and then drying; and peeling off the release paper, trimming, rolling, and thus obtaining the synthetic leather finished product.