The conductive and thermal conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals and the heat conductivity exceeds steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature, even in high temperature, the graphite is adiabatic.

　　The lubrication of graphite depends on the size of the larger scale, the lower friction coefficient, and the smaller the friction coefficient the better lubricating performance.

　　The graphite has good toughness, it can be made into very thin sheets; violent change at room temperature when using can withstand temperature without damage, sudden temperature, volume change of graphite is small, no crack.

　　The melting point of the high temperature resistant graphite is 3850 + 50 DEG C, and the boiling point is 4250 DEG C. Even though the arc is burnt by ultra high temperature, the weight loss is very small, and the coefficient of thermal expansion is very small. The strength of graphite increases with the increase of temperature, and the strength of graphite is doubled at 2000 degrees centigrade.

　　Acid and alkali resistance of graphite has good chemical stability at room temperature, acid resistance, alkali and high pure graphite rods: corrosion resistance to organic solvents is commonly used in high pure graphite material processing, the graphite material after impregnation, roasting, extrusion with graphite rods with high function and characteristics. Pure graphite rod is also used for processing of graphite products, graphite parts etc.

　　Our company can provide all kinds of the graphite material for different application. The molded graphite and isostatic pressing graphite. The main physical and chemical performance index is up to standard. The compressive strength is up to 1 2 5 MPa, Shore hardness reaches 6 5 and the resistivity reaches 1 2 μ Ω m. we have applied for 10 patents including isostatic graphite producing method invention patent. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction. Selling well in all cities and provinces around China, our products are also exported to the clients around the world. please feel free to contact us If you are interested in any of our products or would like to discuss a custom order. We are looking forward to forming successful business relationships with new clients around the world in the near future!

　　The graphite material can be divided into coarse grain structure, fine grain structure and fine grain structure from the structure , distinguished from molding method, it mainly can be divided into vibration molding graphite ,extruded molding graphite , molded graphite and isostatic pressing graphite.

　　As all we known , the molded graphite material with high purity, low ash content , its carbon content is over 99.9%, it is a good choice of making crucible and other high quality products.at the same time, it has low ash,high thermal stability and high thermal conductive.It could be used in arc furnace as heat element. The using life is longer than the metal. And it has good oxidation resistance. It is easy to install and reduce the cost. Our graphite block also could used as raw material. It could be make crucible,mould and other graphite products.

　　The advantages of the graphite material:Fine grain,the grain size of our isostatic graphite material can be several micron; Homogeneous structure; High density; Excellent thermal conductivity; High mechanical strength; Proper electrical conductivity; Minimum wettability to molten metals; Grain size, ash content, bulk density, electrical resistivity, bending strength, compressive strength, all can be customized.

　　The application of the our graphite materials:Molds, chutes, sleeves, sheathes, linings, etc; in continuous casting systems for making shaped steel, cast iron, copper, aluminum; Sintering molds for cemented carbides and diamond tools; Sintering molds for electronic components; Electrodes for EDM; Heaters, heat shields, crucibles, boats in some industrial furnaces (such as furnaces for pulling monocrystalline silicon or optical fibers); Bearings and seals in pumps, turbines and motors.

　　Our company can provide all kinds of the graphite materials which are in different applications.please feel free to contact us if you are interested in any of our products or would like to discuss a custom order. We are looking forward to forming successful business relationships with new clients around the world in the near future.

　　The graphite which are in different properties should use different processing methods, we will give you a brief introduction:

　　Purification processing of the graphite products : the requirements of graphite products in modern industrial focus on the development of two aspects: the first, the requirements of large crystal scales to achieve high purity, and the second is required to achieve ultra fine graphite particles (such as less than 1 m or 0.5 m). Our company has established the production lines of graphite purification and fine powder processing , the purification method is mainly chemical purification. The most mature technology of graphite chemical purification is melting the caustic alkali and graphite at 700 DEG C, and then washing them to neutral, and then adding hydrochloric acid to treat and wash it so that the carbon content of the graphite can reaches 98% ~ 99%. There are also some manufacturers produce the high purity graphite with the hydrofluoric acid treatment.

　　Processing method for natural crystalline graphite: the natural crystalline graphite has good native floatability. in China , we are basically using the flotation method for processing. the method of multi - stage grinding and multi - selection is adopted to select large scale graphite as soon as possible because of the size of graphite flake is one of the most important quality indicators, The common collector for flotation is kerosene, diesel oil, etc., and the foaming agent is two oil, No. four oil, and the adjusting agent is lime and sodium carbonate.

　　Aphanitic graphite processing methods: the aphanitic graphite crystal is extremely small, so it’s also called microcrystalline graphite, the graphite particles are often embedded in clay, the separation is very difficult. Many graphite mines will crush and process the ore directly and then sell the graphite powder products because of the high grade ore (carbon containing is 60% ~ 80%). At present, some units are still in the process research of microcrystalline graphite flotation (such as oil agglomeration flotation, etc.).

　　The development of semiconductor and the application of graphite materials in the semiconductor industry are inseparable. In the semiconductor industry, a large number of high purity graphite materials are used in the heating system of the single crystal furnace. In the semiconductor wafer processing (including the zone melting, epitaxy, contour processing, etc.) the graphite materials are the auxiliary tool, parts, in the production of polysilicon materials used in the semiconductor silicon wafer as an auxiliary tool, parts. Graphite products for electronic engineering, first of all, to achieve the application in the semiconductor industry. Entering the 21st century, photovoltaic industry has been rapid development, the polysilicon ingot material used in solar battery appeared rapid increase on the yield and market , it also provides a broad prospects of development of new markets for graphite products in the field of photovoltaic industry .

　　The graphite component used in the direct pulling single crystal furnace is a kind of consumable parts, which is processed by a variety of high pure graphite. For example the graphite crucible and other graphite components use high purity fine structure graphite; graphite heater use the high pure isotropic graphite; graphite insulation cover and a graphite cover use high pure granular structure of graphite.

　　In the production of polycrystalline silicon ingot device, a plurality of components need graphite materials. Especially the heating materials used in ingot furnace heater-high purity graphite, and the heat insulation materials- high purity carbon felt insulation materials, they are the important and indispensable supporting material in polycrystalline silicon ingot casting equipment.

　　Due to the heating temperature of the ingot furnace heater is very high (more than 1600 DEG C), the heating material can’t react with silicon material and can’t pollute the silicon material , it must be used in vacuum and inert atmosphere for a long time. The heater is in accordance with the conditions of use, such as metal tungsten, molybdenum and non - metallic graphite. But the tungsten and molybdenum are expensive and difficult to process, the source of graphite is wide and can be processed into various shapes. In addition, graphite has the characteristics of small thermal inertia, fast heating, high temperature resistance, heat shock resistance, large radiation area, high heating efficiency, and stable performance. Because of this, graphite materials have become the preferred heating material in the ingot furnace heater.

The graphite material and parts are already widely used in all kinds of industries for almost 50years,as the many good properties,such as :electricity conducting,corrosion resistance and good thermal conductivity,it is widely used for electrode,electro-chemical power,carbon brush on the motor and the gasket etc. However,the mechanical properties of graphite material is weak,easy to break and crash,limit the range of use.

　　The graphite material impregnated with phenolic resin can improve the mechanical properties. The phenolic resin has several good properties such as high thermal stability, structural integrity etc,and making it as one of the binders of graphite is a good way to reduce the opening rate and improve the mechanical properties. Now the graphite impregnated phenolic resin is one of the most common use graphite products among all the graphite chemical products,the graphite tube impregnated phenolic resin is widely use for heat exchanger.

　　Some Scholars’testing showed that the impregnated graphite under 160℃ condition of cure has the best performance(the highest weight gain rate, the lowest porosity,the highest shore hardness)and the flexural strength under temperature 140℃ is the best,and it has the best thermal stability. The thermal stability is better during 0~450℃,but then the temperature reach 450℃ above,the phenolic resin will be decomposition,and the performance will be lower.

　　The temperature has a big influence on the phenolic resin impregnated graphite material. The reason weight gain rate under 160℃ is the highest is because when the temperature below 160℃even lower,the phenolic resin can not full diffusion in the graphite material and lead to the overall uneven,and if the temperature is too high,the viscosity of phenolic resin will be reduction,and lead to lack of binder, can not reach the desired effect.

　Graphite (siliconized) is a kind of composite material which is made of silicon carbide coating on the surface of graphite material. The hardness of silicon carbide is the hardness of SiC, it is only after diamond, boron nitride, boron carbide, the hardness is higher than that of tungsten carbide, three aluminum oxide, two. Silicified graphite used as phosphoric acid, hydrofluoric acid and amine and phosphorus bearing pump. In addition, the semiconductor industry, as silicon epitaxial growth of the heating sheet matrix and fixture and manufacture of artificial joint, artificial heart valve, artificial root and so on

　　There are three methods to make the production of siliconized graphite : chemical vapor deposition (CVD), Chemical vapor reaction method (CVR), and liquid silicon infiltration reaction.

　　Chemical vapor deposition (CVD) method

　　The gas containing silicon and carbon was decomposed by the high temperature graphite matrix, and the SiC was deposited on the surface of graphite matrix. Raw materials for the three (CH3SiC3), four hydrogen chloride, hydrogen, silicon vapor, etc.. The deposition temperature range is wide, from 1175 to 1775. The SiC layer generated by this method is very compact, uniform thickness, average thickness is about 0.1 ~ 0.3mm. But SiC and graphite matrix with pure mechanical binding, the binding force is weak, in temperature blast SiC layer prone to cracking and spalling.

　　Chemical vapor reaction method (CVR)

　　Raw material for coke powder and excessive amounts of quartz sand or no amorphous silica fume, when heated to 2000 degrees occurred chemical reaction to generate the SiO vapor. SiO vapor and carbon matrix reaction to generate SiC. SiC layer and the carbon matrix without obvious interface, are firmly combined, under high load and sudden changes in temperature will not fall off, but CVR method is SiO gas infiltration of carbon base body reaction, therefore, still retains the porous carbon matrix, when used as a sealing material, need resin dip stains or CVD pore filling.

　　liquid silicon infiltration reaction.

　　liquid silicon infiltration reaction.is also a kind of CVR. Under the vacuum condition, the carbon matrix is directly immersed into the molten silicon liquid by heating up to 1700-1900, and liquid silicon is gradually infiltrated into the carbon matrix, and the reaction is generated by SiC. Raw materials for 99.9999% of pure silicon. The thickness of SiC layer is 3.5mm. After the reaction, the carbon matrix contains about 17% of the free silicon in the matrix, so that the matrix becomes dense and opaque. However, the corrosion resistance and high temperature oxidation resistance of silicon carbide were decreased by the presence of free silicon.

      1, Graphite can be used as a refractory material: graphite and its products have properties of high - strength, high temperature resistance, mainly used to produce graphite crucible in the metallurgical industry, in steelmaking in graphite is usually used for the protection of steel ingot agent, metallurgical furnace lining.

　　2, Graphite can be used as the conductive material: used for manufacturing electrode, carbon brush, carbon rod, carbon nanotubes, mercury is the cathode in electrical industry, graphite gaskets, telephone parts, TV picture tube coating.

　　3, Graphite can be used as a wear-resistant material: Graphite in the mechanical industry often as a lubricant. Lubricating oil is often not used in high speed, high temperature and high pressure, while the graphite wear resistant material can be used in the temperature of the 200~2000 (a) at a very high speed, without lubricating oil. Many devices for conveying corrosive media are widely used in the piston cup, sealing rings and bearings, which do not need to be added to the lubricating oil. Shi Moru is one of 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 characteristics, which is widely used in the manufacturing of heat exchanger, reaction tank, condenser, the burning tower, absorption tower, a cooler, a heater, a filter and pump equipment. Widely used in petrochemical, wet metallurgy, acid alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.

　　5, Graphite can be used casting, foundry, molding and high temperature metallurgical material: due to graphite thermal expansion coefficient is small, and the capability of rapid quench heat changes, as the mold of the glass, the use of graphite black metal by casting, precise size, smooth surface and high rate of finished products, processed or minor processing can be used, thus saving a large amount of metal. Production of hard alloy and other powder metallurgy process, usually made of graphite materials and sintered in the use of the porcelain boat. The crystal growth crucible, the area of the refining container, the support fixture, the induction heater and so on are all made of high purity graphite. Graphite can also be used for vacuum smelting of graphite heat insulation board and base, high temperature resistance furnace tube, rod, plate, grid and other components.

　　6, Graphite can be used in the atomic energy industry and defense industry: graphite has a good neutron reducer for the atomic reactor, uranium graphite reactor is currently used more of an atomic reactor. As the power of the atomic energy reactor in the reduction material should have a high melting point, stability, corrosion resistance, graphite can meet the above requirements. As the graphite purity of the nuclear reactor is very high, the impurity content should not exceed several tens of ppm. In particular, the boron content should be less than 0.5ppm. In the defense industry, the use of graphite to produce a solid fuel rocket nozzle, a missile nose cone, the space navigation equipment parts, heat insulation materials and ray material.

　　7, graphite can prevent the boiler fouling, the unit test shows that adding a certain amount of graphite powder in the water (about 4~5 grams per ton) can prevent the boiler surface fouling. In addition graphite coated metal chimney, roof, bridge, pipeline can be anti-corrosion.

　　8, graphite can be used as pencil core, pigment, polishing agent. Graphite after special processing, can produce a variety of special materials for the industrial sector.