Graphite is soft, black and gray; greasy, polluting paper. The hardness is 1~2, and the hardness increases to 3~5 with the increase of impurity in the vertical direction. The specific gravity is 1.9 ~ 2.3. The specific surface area is concentrated at 1-20m2/g, and the melting point is above 3000 degrees under the condition of oxygen isolation. It is one of the most temperature resistant minerals. It can conduct electricity and conduct heat.

　　According to these characteristics, graphite products are widely used in the following industry areas:

　　1, refractory material: graphite and its products have the properties of high temperature resistance, high strength, in the metallurgical industry is mainly used to manufacture steel commonly used in graphite crucible, graphite as the protective agent of steel ingot, metallurgical furnace lining.

　　2, conductive material: used for manufacturing the electrode, carbon nanotubes, carbon brush, and the positive electrode of the mercury rectifier in the electrical industry, graphite gasket, telephone parts, TV tube coating etc..

　　3, as wear-resistant lubrication material: graphite is often used as lubricant in the machinery industry. Lubricants can not be used in high speed, high temperature, high pressure conditions, and graphite wear-resistant materials can be at 200~2000 C temperature in a high sliding speed, without lubricating oil work. Many devices that transport corrosive media are made of graphite materials, piston cups, seals and bearings. They do not need to be lubricated when they are running. Graphite is many metal processing (drawing, drawing) the good lubricant.

　　4. Graphite has good chemical stability. After special processing of graphite, with corrosion resistance, good thermal conductivity, low permeability, is widely used in the manufacturing of the heat exchanger, the reaction tank, condenser, combustion tower, absorption tower, cooler, heater, filter and pump equipment. Widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, papermaking and other industrial sectors, can save a lot of metal materials.

　　5, casting, casting, molding and high-temperature metallurgical material: Graphite due to thermal expansion coefficient is small, and the capability of cold and hot change, can be used as a mold of the glass, the use of graphite after black metal castings get precise size, smooth surface, high rate of finished products, can be used without processing or a processing. So we can save a lot of metal. The powder metallurgy process, such as cemented carbide, is usually made of graphite material and used as a porcelain boat for pressing and sintering. The crystal growth of monocrystalline silicon, crucible, refining vessel, bracket jig, induction heater and so on are all processed by high purity graphite. In addition, graphite can be used as vacuum melting graphite insulation board and base, high temperature resistance furnace tube, rod, plate, lattice and other components.

　　6, for the atomic energy industry and the national defense industry: graphite has a good neutron reducer used in atomic reactors, uranium graphite reactor is one of the more widely used atomic reactor. As a power plant, the deceleration material in the atomic energy reactor should have high melting point, stability and corrosion resistance, and graphite can meet the above requirements. As an atomic reactor, the purity of graphite is very high, and the impurity content should not exceed tens of PPM. In particular, boron content should be less than 0.5PPM. In the defense industry, graphite is also used to make nozzles for solid rocket rockets, nose cones for missiles, parts for aerospace equipment, thermal insulation materials and radiation protection materials.

　　7, graphite can prevent boiler scaling, the unit test shows that adding a certain amount of graphite powder in water (4~5 grams per ton of water) can prevent boiler surface scaling. In addition, graphite can be applied to metal chimneys, roofs, bridges and pipelines to prevent corrosion and rust.

　　8. Graphite can be used as pencil core, pigment and polishing agent. After special processing, graphite can be made into various special materials for industrial departments.

　　9, electrode.

　　10. Modifying agent to improve the wear and corrosion resistance of rubber.

　　In general, the graphite crucible before using the inspection work, should do the following main points:

　　1. first of all, to check whether there is a crack in the graphite crucible before work, no cracks need to heat the graphite crucible to more than 600 degrees C and fully dry.

　　2. water around a stove and furnace before the pit, near the graphite crucible do not stack irrelevant articles.

　　3. strict inspection charge no explosives, add burden must be preheated and ensure drying, adding graphite crucible slower.

　　Graphite crucible before use, we must do the above points, otherwise it is likely to lead to the graphite crucible in use when the explosion risk.

　　The main purpose of the experimental material is graphite crucible heating heating, the general use of solid materials of graphite crucible heating experiments, graphite crucible with a variety of models, can choose the crucible type according to the number and type of material required for heating and heat expansion degree. In general, we should pay attention not to let the material to be heated with the crucible when using graphite crucible, that is very dangerous, not only easy to cause the accident and the experiment of graphite crucible, life will have a huge impact. In addition, attention should be paid to the fact that the crucible is normally heated to four or five Baidu. This time, it is very dangerous to not place graphite crucible or touch graphite crucible with hand.

　　1, the graphite crucible refractory requirements are very high, therefore, we must staple food graphite crucible raw material fire resistance, so that graphite crucible can make more safe use;

　　2, we often use graphite crucible and a variety of corrosive chemical smelting, therefore, the chemical stability of the graphite crucible is also very important, so that it can reduce corrosion;

　　3, graphite crucible hardness and toughness is also the factors we need to consider, to avoid brittle fracture of graphite crucible in use.

　　The above is when we make the graphite crucible, we should choose the material selection method, only in accordance with the above standards to select materials, can let graphite crucible can more fully play its performance.

　　Beijing great wall co., ltd is dedicating on graphite crucible over decade and it is our honor to provide quality products and effective service to our dear clients.

　　Different graphite materials are available for graphite tube pipe for different applications. Extruded, Vibrated, Reused, Impregnated and Oxidation resistant graphite tubes are available.

　　Graphite tubes can be customerized and graphite materials can be selected as per your requirements .

　　Our company supplies all kinds of graphite tube pipe for dryer, compressors, pumps, valves, chemicals, instruments, meters, etc.. We provide customized products depending on your

　　sample or drawing, please contact us to learn more about our products.

　　The graphite tube pipe are applied in many fields, such as furnaces because of graphite's low heat sensitivity;the production of fluxing tubes used in the metal manufacturing industry;Other industries using graphite tubes include chemical and scientific industry; Various types and diameters heating graphite tubes are used in heating vacuum furnace thermal field. Using graphite materials is in order to get high temperature.

　　We can provide all kinds of the graphite tube pipe such as: High purity graphite pipe tube;15% graphite filled PTFE tube pipe;Fine grain long size custom graphite tube pipe for foundry;corrosion resisting Heat exchanger resin graphite tube graphite pipe;special treatment graphite heating tube high purity graphite pipe;sqaure graphite pipe;continous casting carbon graphite Pipe;Anti-Oxidation graphite pipe for mechanical lubricating;Customized high strength carbon graphite pipes for analysis.

　　For large size graphite pipe, it can be used as a liquid pipelines in metal industry. For small size and good material graphite tube, it can be used as an analysis intrument.

　　Graphite pipe and garphite tube are made from high quality graphite material, used for many area , such as chemical metallurgy, automotive, semiconductor and electronic industry and so on.all our the parts are manufactured into high quality graphite or fine structure graphite.

　　The advantage of our service:Exact Machining;Professional engineering support;Patient and smiling business service;Large store of graphite material ensures quick delivery time. We promise to provide the good quality and best service, welcome everyone to purchase from us.

　　The flexible graphite sheet and rolls is made from high purity graphite, it is used can be expanded graphite particles formed by the high temperature expansion of repression, it retains the high temperature crystalline flake graphite, corrosion resistant, self lubricating, etc.The flexible graphite roll is made by flake graphite with high carbon content, which is gone through chemical treatment, expanding under high temperature and then rolling.

　　The flexible graphite sheet has the characteristics of high temperature resistance, corrosion resistance and good elasticity.Flexible graphite sheet sevrve as the basic material for making all kinds of reinforced graphite sheets, graphite tapes, packing and sealing gaskets. Workingtemperature-200~650ºC(in air),-200~3000ºC(in non-oxidizing media).

　　Flexible graphite sheet, normally we call it "Expanded Graphite Sheet", it is made of nature graphite flake. Expanded graphite rolls is chemically treated graphite interaction compound.This interaction compound is then rapidly heated to decomposition.the result is a rapid expansion of the particle size. Then they are formed into graphite sheets by rolling.

　　Graphite sheet is a kind of thermal inferface materials with a high performance and low cost. It is used in the occasion of without electrical insulation. It has low thermal resistivity,light weight features and uniform heat conduction along the X,Y direction. Its special unique grain-oriented, lamellar structure will be well adapted to any surface, thus make heat conduction to optimization.its surface can be combined with metal, plastic, pressure-sensitive-adhesive materials to meet more design function and needs. This product can be cutted into special sizes according to customer requirements.

　　High thermal natural graphite sheet is new thermal conductive material, with heat conduction along two directions, shield heat and components while improving consumer electronic products performance

　　We also can produce the heat-conductive synthetic graphite sheet.This material is synthetically made of graphite polymer, super thin, high thermal conductive, and flexible. It has been widely used in small high integrated electronic applications. It can be cut into customized size and shape, backed with adhesive and membrane. It is an ideal material as heat spreader or as heat sink in limited space.

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　　Carbon/graphite plate Rod are made by low ash raw material, with high temperature graphitizing and ash handling treatment. Mainly used in electrolysis and electroplating industry. these carbon/graphite plate/ros work as the exclusive anode material in the electrolytic cells for generating fluorine gas or sulfur hexafluoride gas.

　　Graphite plate rod for non-metallic products, as a necessary in the process of carbon arc air gouging cutting cutting in front of the welding consumables, is made of carbon, graphite, and the proper adhesive, by extrusion forming, after 2200 ℃ baking spin segments is made by a layer of copper plating, high temperature resistance, good electrical conductivity, not easy to break, suitable for metal cutting into the shape of a meets the requirements.

　　Graphite plate rod is most frequently used in the heating element of high temperature vacuum furnace, and the highest temperature of the graphite rod can reach 3000℃. It’s also widely used in a heat source or heat radiation of high-temperature environments and other various mechanical friction conditions. It has such traits as high thermal conductivity, high thermal stability, temperature shock resistance and excellent electronic property.

　　The applications of the carbon /graphite plate or rod:Electrodes, anodes, cathodes, resistors, whisking rods, special structural parts, etc;In metallurgy, mechanical engineering;Chemical & electrochemical industry, glass & ceramics and other industries.

　　The properties of the carbon /graphite plate or rod:Fine grain;High density and high mechanical strength;High thermal and chemical resistance;High resistance to thermal shock;Proper electrical conductivity.

　　The typical sizes of the carbon graphite rod :Diameter (mm) 2-30 and Length (mm) 300-600.

　　Other diameters and lengths are available on request.

　　We can provide all kinds of the graphite materials for different applications.please contact us at any time if you need our our graphite products such as carbon graphite plate or rods.

　　High purity graphite crucible material has the advantages of high sublimation temperature, high mechanical strength, self lubrication and heat shock resistance, but it is oxidized in the oxygen atmosphere higher than 4500C. In order to further improve the graphite plate, graphite rod graphite products, high temperature resistance, wear resistance and corrosion resistance, has been the emergence of a coated graphite materials, graphite products in surface impregnated or coated with a layer of metal or metal compounds in order to improve the performance of graphite.

　　The main application of high purity graphite crucible:

　　The main purpose of high purity graphite crucible is melting and experiment of metal. Because of the high boiling point of metal melting, other materials and ordinary ceramic crucibles will also melt, which does not meet the requirements. The melting point of graphite is ideal at 3652 degrees, and corrosion resistance and strength are good.

　　The main advantages of high purity graphite crucible:

　　High purity graphite has the advantages of small resistance coefficient, high temperature resistance, corrosion resistance, oxidation resistance, good thermal shock resistance, small conductivity, thermal conductivity, low expansion coefficient, self lubrication, easy precision machining and so on.

　　1. high temperature resistance type: Graphite melting point is 3850 + 50 degrees, boiling point is 4250 degrees, even if the ultra-high temperature arc ignition, the weight loss is very small, the thermal expansion coefficient is very small. The strength of graphite increases with the increase of temperature, and the strength of graphite is doubled at 2000.

　　2. conductivity and thermal conductivity: the conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals. Thermal conductivity is higher than that of steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature, even at extremely high temperature. Graphite can conduct electricity because each carbon atom in graphite has only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electrons to transport charges.

　　3. lubricity: graphite lubrication performance depends on the size of graphite scales, the larger the scale, the smaller the friction coefficient, the better the lubrication performance.

　　4. chemical stability: graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.

　　5. plasticity: the toughness of graphite is good, can be rolled into very thin sheet.

　　6. thermal shock resistance: when graphite is used at room temperature, it can withstand the drastic change of temperature without damaging. When the temperature changes suddenly, the volume of graphite changes little, and cracks do not occur.

　　Because of its good shielding and large specific surface area, graphene is easy to form dense film in the coating, which is of great help to improve corrosion resistance and attracts a lot of attention. A series of studies have shown that graphene grown on CVD can form a protective layer on the surface of copper, aluminum and other metals to prevent oxidation and corrosion of metals.

　　Reduced graphene oxide prepared with organic resin hybrid composites prepared by coating graphene, play shielding effect and excellent adhesion to resin, long-term preservation purposes, with the preparation of graphene coatings compared to conventional coatings, the corrosion rate of low alloy steel is reduced by 1 orders of magnitude. In addition to conventional corrosion protection, graphene can also react with hydrogen in metals to prevent hydrogen embrittlement. In addition, graphene can also improve the corrosion resistance of metals, and can also be used as a biological environmental protection layer.

　　At present, the application of graphene anti-corrosion coating is more mature graphite zinc powder heavy-duty anti-corrosion coatings, graphene anti-corrosion coatings in such heavy anti-corrosion mechanism is generally considered as follows:

　　(1) physical isolation.

　　Cl - has the characteristics of small ion radius, strong penetration, and can be strongly adsorbed by the metal surface. The two dimensional lamellar structure of graphene has a specific surface area of 2630m 2/g, which is layered distribution in the coating, forming a dense physical isolation layer, and has a good physical isolation function. Graphene is extremely dense, and even the smallest gas molecules can not penetrate, can effectively isolate Cl – penetration. Small size graphene can be filled into the coating defects, to a certain extent, to prevent and delay the molecular corrosion medium intruded into the metal matrix, enhanced the physical isolation of the coating.

　　(2) electrochemical protection.

　　The quality of zinc powder used in cathodic protection of epoxy zinc rich primer is only 20%~30%, and the remaining zinc powder is used as conductive medium. When the zinc powder is oxidized, it loses its electrical conductivity, and the coating loses its cathodic protection. Graphene has good electrical conductivity. Although zinc anticorrosive primer graphene greatly reduces the zinc content, but the film evenly dispersed graphene nanosheets to form a dense and continuous reticular layers of conductive structure, forming a conductive pathway and zinc zinc coatings in the lap, and activation, the coating on iron and steel base material to form a system of electrochemical loop to improve the cathode the protective effect of the coating.

　　Graphene epoxy zinc primer was prepared by replacing some zinc powder in epoxy zinc rich primer with graphene. The experimental results show that the zinc content of 47% mass fraction, dry film thickness of 100 m film, salt mist can reach 2500h, the scratch single expansion eclipse < 1mm, foaming, rust, cracking, spalling no scratches, corrosion resistance is higher than that of the high zinc content of zinc rich epoxy primer.

　　Ordinary graphite cudgels pure graphite rod difference density and porosity of graphite rods, graphite rods without impregnation and calcination, is the use of graphite powder and binder extrusion molding, strength and density are very soft, falling dust, easy to loose. Greatly reduce the graphite conductive and lubrication characteristics. There is the use of graphite powder particles of different sizes, the graphite materials are of high purity graphite as raw materials for processing the high pure graphite graphite rod is used mostly recycled graphite powder, graphite powder is recycled some recycled graphite products used in pulverizing with binder molding, graphite powder so this impure, graphite raw materials produced graphite particles of coarse, large pores, trachoma and more. Mainly used for carbon arc gouging carbon rod cutting foundry, appearance is coated with a layer of copper to moisture conductive around.

　　Pure graphite rod has high density, high strength, high purity graphite made, than ordinary graphite rod is to wear a little, but also relative wear resistance, some graphite products need to in the rotating device, so this requires ultra high pure graphite abrasion resistance, because there will be dust in repeated rotation friction thus, high purity graphite product itself is not very wear-resistant.

　　the high purity materials simple ink manufactured by high purity graphite of high purity graphite rods with the same specific, high purity graphite rod belongs to artificial graphite, graphite powder is called asphalt binder or coal oil coke after high pressure extrusion molding machine, and then after several high-temperature roasting and impregnation, the inside of the graphite the adhesive has evaporated, and fill the gap by impregnation evaporation, so stomatal production and processing of high pure graphite rods, chlamydia, has the advantages of high density, high hardness, wear resistance, high strength characteristics.

　　Application environment of high purity graphite rod:

　　High pure graphite rod electrothermal commonly used in high temperature vacuum furnace body, a graphite rod maximum temperature is 3000 degrees centigrade, the graphite rods are easily oxidized at high temperature in vacuum, the graphite rods only in the neutral atmosphere or reducing atmosphere in use. Its lower thermal expansion coefficient, high thermal conductivity, resistance coefficient (8~13) * 10-6 Omega - m, SiC, MoSi2 processing is good, high temperature resistance, resistance to extreme heat is good, the price is cheaper.

　　PAN based plate felt as the material, the high temperature of graphite to make carbon felt, can be used as a variety of high temperature vacuum furnace insulation materials, but also can be used as carbon / carbon composite material.

　　Application case:

　　The products involved in the field of aerospace, vacuum metallurgy, photovoltaic solar new energy, new chemical materials, is the kinds of domestic products, research and development capabilities of the strongest specializing in the production of hard composite mat and batch production of high-temperature high purity graphite felt material manufacturers. Main production carbon felt, graphite felt, hard composite mat, ancillary products are mainly molybdenum wire, carbon cloth, carbon rope, etc., products widely used in all kinds of high temperature vacuum furnace equipment (such as: single crystal growth furnace, polycrystalline casting furnace, polycrystalline reduction furnace, vacuum sintering furnace, hot pressing furnace, heat balance of furnace, induction furnace, non oxidizing atmosphere high temperature equipment, high purity silicon hydrogenation furnace, etc.).

　　Features: high temperature resistance, corrosion resistance, small specific heat capacity, good thermal insulation, high purity, low ash, soft and soft properties, and a high degree of shape retention. In the high temperature environment of vacuum or inert gas, the performance of thermal insulation material is very good and stable, which is a good thermal insulation material of silicon and polycrystalline silicon.

　　The graphite electrode paste is a conductive material that is used to supply iron alloy furnace, calcium carbide furnace and other electric furnace equipment.

　　The electric current is produced by the electric arc in the furnace. The electrode is very important in the whole electric furnace. Without it, the electric furnace can not be produced. To make the electrode in the arc temperature under normal working, must have high resistance to oxidation and conductivity, which only made of carbon material electrode, this nature, because the carbon electrode can withstand up to 35 DEG C arc temperature only slow oxidation.

　　Raw materials to be updated"

　　Now used in the production of electrode paste material basically is general calcined anthracite coal, metallurgical coke powder, medium temperature coal tar pitch; should be updated to use electric calcined anthracite, calcined petroleum coke, change coal asphaltenes. Pu calcined anthracite specific resistance is higher than that of electrically calcined anthracite 70%; metallurgical coke powder was calcined petroleum coke 2.5 times better than that of the resistance, modified bituminous coal of toluene insoluble, coking value is higher than that of the medium temperature coal tar pitch. After the replacement of raw materials, the quality of the electrode paste on a step.

　　Although raw materials of upgrading to increase the cost of electrode paste, electrode paste the price increase, but must be able to use to reduce the production cost of the electrode paste manufacturers, improve the use of factory production stability and the quality of the products. The total cost of using the manufacturer will not increase or increase is not much.

　　Also some of the electrode paste manufacturers to update one or two kinds of raw materials, not all updated, no effect, or the effect is not obvious. In fact, the overall integration of the effect is not reflected, in particular, the use of modified coal tar pitch there are technical problems, the need for professional and technical personnel guidance.

　　Equipment to "update"

　　Equipment is the production of hardware, in advocating science and technology progress today, the hardware is not hard, it means that the competitiveness is not strong. Although some enterprises also updated some of the equipment, but overall equipment is not enough, we must from the crushing, screening, grinding, mixing, kneading, forming a comprehensive package. Especially the paste forming can not be used. Paste molding machine not only can produce large pieces of paste into small pieces of paste, but also increase the plasticity of the electrode paste, to solve the use of large paste paste in the furnace to melt easily formed holes. The effect of electrode paste was improved.