Carbon carbon composite material will occur oxidation in the circumstance of temperature above 450 C°,the rate of oxidation will increase rapidly with the temperature raising.some researches show that the strength of the carbon carbon composite material will reduce 10% with the oxidation loss 1%.the oxidation can not only cause the material loss,but also have the security risks on the material itself. So it’s important to do some protection of the C/C composite material.

　　The method of antioxidant treatment mainly divided into two categories.one is matrix modification to be antioxidant, and another one is surface coating to be antioxidant.the matrix modification way is to treat the CFC material during the preparation process,by using the CVI, impregnation or chemical reaction synthesis etc to add into the matrix or form antioxidation particles,such as Si,SiO2,B,B4C,MoSi etc.

　　However,it will make the CFC material can not be continuous with carbon,so it will change the thermophysical and strength properties(if too much antioxidation particles). During the friction process of the carbon carbon composite material,the antioxidation particles will wear and tear(because of the hard phase),so it will have a big influence on the carbon carbon composite material during the friction processing.the CFC material will start to oxidation when 370 C°,after mixing the antioxidation particles,the starting temperature of the oxidation can be increase to　600 C°.

　　The surface coating method need to confirm the oxygen barrier agent. The agent need to isolate the composite material and the oxygen circumstance. In addition,the agent must have low volatility,because it can avoid excess loss during the high velocity air.The coating must also have a good adhesiveness with the carbon matrix,and can prevent carbon from leaking out.

　　Si3N4,SiC,are some good oxygen barrier agent,they have a high temperature resistance,meanwhile,the SiO2 (forming of the surface)can be oxidation resistance.

Graphite color steel from iron ash to ash, black streaks, has significant heterogeneity, optical inhomogeneity, hardness and opaque, with metallic luster, aphanitic qualitative is bleak. 1 ~ 2 hardness, specific gravity 2.09 ~ 2.23, inferior graphite proportion is 1.84 ~ 1.98. (the proportion of change is decided by the amount of bubbles and). Chip can bend, soapy, paper and fingers to pollution. Graphite heat resistant (higher than copper and aluminum), with high electrical conductivity, which can withstand temperatures up to 3000 ℃, melting point 3800 ℃, boiling point 4250 ℃, plastic, chemical stability strong, insoluble in acid and alkali.

　　Use and applications

　　(1) the manufacture electric smelting furnace, electrolytic cell, the arc lamp and arc welding electrodes and generator, motor carbon brush, resistor and phone machine, etc.

　　(2) manufacturing various metallurgical crucible.

　　(3) the graphite is able to absorb a large number of neutrons, so can be used as a moderator in the atomic reactor, but it must be highly pure crystalline graphite.

　　(4) used for foundry mold surface coating, antirust paint, machine lubricant, bearing lubricant.

　　(5) a mixture of all kinds of refractories and refractory insulation materials.

　　(6) manufacturing KangFuXing paint.

　　(7) manufacturing pencil lead, as the black color material.

　　(8) by special chemical treatment, can make the flexible sealing material.

The main use graphite paper　　

     1.Computers, smart phones, high power.The LED,Application of tablets, smart terminal;

　　2.Graphite paper for large communication equipment and peripheral equipment;

　　3.Used in power transformation, power supply equipment and peripheral equipment;

　　4.Graphite paper used for photovoltaic power generation equipment and the surrounding.

　　Graphite paper Features:

　　1.Graphite paper (graphite foil)light weight, lighter than copper75%,The lighter than aluminum25%

　　2.Graphite paper surface can be combined with other materials such as metal, plastic, stickers to meet more The design of more functions and needs;

　　3.Easily cut: graphite heat sink can smooth attached with any platform Surface and curved surface, and can be　In accordance with customer demand for any form of cutting;

　　4.High thermal conductivity graphite paper (350 w/mk - 1500 w/mk);

　　5.Low thermal resistance, thermal resistance is lower than aluminum40%,Lower than copper,20%

　　As refractory materials ,Including the refractory，Crucible for,Continuous casting powder,The mold core,Mold detergents and high temperature resistant material.nearly20 over the years,refractory Industry is the two important changes in magnesia carbon brick is widely used in steel furnace lining,Aluminum and carbon brick should be in continuous casting with.The graphite refractory material and steel industry is closely linked,The world steel industry consumes around70%，The refractory 60 The mid -,Developed by the United States;70s,The Japanese steel industry began to make magnesia carbon brick.Used for water cooling in the arc furnace steelmaking.At present, the worldwide magnesia carbon brick has a large number of used in steelmaking,And has become a kind of graphiteSystem USES 80.s,Magnesia carbon brick for oxygen top-blown converter lining began.The UK used of basic oxygen steelmaking furnace lining,Materials are mostly magnesium carbon brick,Lining life is 1000.At a time1500,While Japan,The service life of furnace lining2000,At a time2500Times.

　　Aluminum carbon brick carbon refractory material is mainly used in continuous casting,Flat steel billet from a shield of pipeline,Submerged nozzle, and the well Cartridge etc..With continuous casting of steel production in Japan of total production90%/The above,In the UK for 60%.Made of graphite crucible and relevant products forming and the crucible refractory and its related products,Such as crucible,retort,Plug head and,Nozzle etc.,With high fire resistance,Low thermal expansion,In the process of melting metal,By metal infiltration and erosion is stable,The high temperature,Good thermal shock resistance and good heat conductivity,So the graphite increases would harm its related products are widely used in molten gold directly in the process of the genus.

       Graphite heat sink, is a kind of new heat conduction material, has a unique grain orientation, along the two directions of uniform heat, film layered structure can be well adapted to any surface, shielding heat source and components of the same time to improve the performance of consumer electronics products. Products even heat dissipation in the thickness of the heat insulation. The molecular structure of the thermal conductive graphite sheet is as follows:

　　The unique thermal and thermal insulation properties of graphite heat conduction solution make the thermal conductive graphite to be an outstanding material for heat management solution. The thermal conductivity of the graphite film plane has a high thermal conductivity within the range of W/m-K 150-1500.

　　Flexible Graphite sheet C (Thermal) is a natural element, which can be used as a kind of natural element, which can be used in many fields such as electronic, communication, lighting, air and defense industry. It has been widely used in electronic, communication, lighting, air defense and other fields because of its good properties.

　　Graphite heat conduction material provides a unique solution to the heat management industry. Heat conduction graphite materials through a series of different heat management solutions to the growing demand for industrial cooling technology to bring new technology to provide a new technology for hot graphite material products to provide a new technology for electronic industrial heat management. Thermal conductive graphite in the case of reducing the weight of the device to provide a more excellent thermal performance, thermal conductivity graphite thermal solution is a new application of thermal design. Thermal design of electronic equipment for thermal conduction graphite.

　　The advantages of the graphite heat sink

　　1. Low thermal resistance: thermal resistance is 40% lower than that of aluminum, which is lower than 20%

　　2.Light weight: weight is lighter than aluminum 25%, 75%

　　3.High thermal conductivity: graphite heat sink can be smooth and attached to any plane and curved surface, and can be in accordance with the needs of customers for any form of cutting.

　　The mechanical properties of CFRP depends mainly on the matrix, the mechanical properties of common epoxy resin , the surface properties of carbon fiber, and the nature of the fiber and the matrix bonding interface, and the performance of the matrix and fiber surface properties directly related to the interface bonding and adhesive performance, the following described from two aspects:

　　1、Matrix: CFRP commonly used epoxy resin as matrix, its good adhesion, excellent mechanical properties, but the general type of epoxy resin after curing, brittle hard, shock resistance is poor, poor heat resistance. At present, the toughening method is relatively mature will cure before can compatible rubber and epoxy resin dissolved in resin, curing, rubber to precipitate, a two phase structure. At present commonly used are RLP type rubber, small molecular weight (1000 ~ 10000), with epoxy resin with reaction of functional groups, so as to produce strong chemical junction. We can make the epoxy resin matrix containing aromatic ring main chain structure and increase the crosslinking density method, such as epoxy resin to improve use temperature and thermal stability, at the same time improve its and adhesive properties of carbon fiber.

　　2、The carbon fiber surface properties: Without the surface treatment of carbon fiber surface is smooth, small friction coefficient, surface presents abhorred liquidity, leading to poor wettability with matrix, bond is low, the interlaminar shear strength (ILSS) of composite materials, interfacial shear strength (IFSS) are low, can not meet the actual demand. Commonly used the surface treatment of oxidation and coating processing, electrical aggregation and the electroplating treatment, plasma treatment and so on. Using the method of electrochemical oxidation, anodic oxidation surface treatment, moderate reaction, easy to control, the treatment effect is good. After surface treatment of carbon fiber with effective scanning tunneling electron microscope (STM) surface analysis found that the edge of the surface of graphite layer of oxidation, large-area edge active point number increase, is more advantageous to the uneven surface and bonding of matrix, and the shear properties of composite materials. At the same time, its surface can increase, significantly improved the wettability between carbon fiber and matrix, the contact Angle decreases, and surface present a lyophilic sex. In addition, after surface treatment, its surface appear a large number of hydroxyl, carboxyl, quinones and pyranoid ketone functional groups, improve the polarity of the carbon fiber surface, increase with the wettability between substrate and adhesive. Carbon fiber reinforced polymer (CFRP) has been quite widely in the field of aerospace and defense force. Such as CFRP can be used in the manufacture of artificial satellite support, satellite antenna, the wing of the shuttle, the rocket's crater, strategic missile final boosters, the robot's shell, etc. Aircraft to meet the light, strong, strong resistance to distortion, a Boeing 767 aircraft, its fuselage drive door, landing gear doors, hood, main wing, the top of the flap, the back of the tablet and other parts are made from carbon fiber and CFRP, total more than 1 ton. Automobile manufacturing, automobile shell, joystick, flake spring made of CFRP, can make the total weight of the car to reduce 70%. Sports leisure aspects, fishing rod, tennis rackets, skis, racing, pole high jump are made of CFRP, greatly enhance the performance. Frame structure of the high-rise buildings by using CFRP can rise to enhance, increase, reduce the load of building base, and so on, the other party # 40 # in December 2001, such as bicycle beam, the sword of rapier loom belt, under heavy load of elevated intersection beam, column, etc are made using CFRP available.

      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.

　　Crucible is mainly divided into three types of graphite crucible, clay crucible and metal crucible. In order to adapt to the development of social economy, people invented the innovation, expand the scope of its use, such as graphite crucible, silicon carbide crucible, electric furnace crucible, crucible, intermediate frequency furnace isostatic pressing graphite crucible, and so on. GW group, professional build graphite products for 30 years, this article is about the advantages of molten copper graphite crucible:

　　(1) high heat conductivity, by using the high thermal conductivity graphite and other raw materials, shorten the melting time.

　　(2) heat shock, heat shock performance is strong, for thermal shock, not easy to burst;

　　(3) the high heat resistance, high refractoriness, resistant to 1200 ~ 1600 ℃ high temperature;

　　(4) the erosion resistance, strong corrosive against molten soup;

　　The molten copper graphite crucible is now smelting factory and foundry enterprises use most a configuration, it has special properties of solid, not only is only can resist high temperature and hot environment edify, can also is one of the best for heat conduction. In the process of use also is very not easy to deformation, there will not be heated as inflation is probably cold shrink problem. Very well under the environment of alternating use of. And its chemical properties are very stable, is not susceptible to decay and dissolved. Started in on the cold isostatic pressing molding in manufacturing, manufacturing pressure of 600 mpa. Make products internal structure symmetry in good condition, high strength. In the metal industry now, often have higher dissolution results. Its advantage lies in the crucible, and even can probably in low temperature environment, promote the melting of metals. And thus it can be seen, so that the oxidation resistance of the crucible and constant temperature black and white is often high. Is in the process of production, is widely used. And dealing with other products, molten copper graphite crucible without too much pollution, therefore sought by Volkswagen, its market demand also increases gradually.

Graphite is a very good lubricant, and sometimes to graphite with Vaseline or motor oil are mixed together to form graphite lubricant, it can be used to replace oil lubricants operating in high temperature parts of the machine. Graphite lubricant is mainly iron and steel enterprises rolling machine with an important process of material consumption, the mandrel is in more than 900 degrees high temperature steel tube and withstand high rolling pressure state during to large relative sliding and steel pipe and high-performance Shi morun slip agent is whether the unit normal production essential factors.

For seamless steel pipe floating, box set, clamping mandrel lubricant for mandrel dairy, holding the patent technology of graphite, the lowest friction coefficient, good adhesion, off the stick performance good, soluble, good stability, application of solid low, the viscosity is 40 to 70 seconds.

Graphite lubricant, the lubricant is composed of graphite powder, sodium silicate, sodium silicate, sodium silicate, sodium silicate, and surfactant, wherein the weight of the lubricant is accounted for by 60-85%, the weight of the sodium silicate which accounts for 4-10%, the weight of the sodium silicate, and the weight of the surface active agent accounted for 0.2-1.5. According to the present invention and the existing technology, the high temperature lubrication characteristics of the lubricant are improved, and the wetting, spreading and emulsifying properties of the medium are improved.

　　Graphite powder is a chemical reaction is very sensitive material, in the different environment inside his resistivity will change, his resistance values will change, but is not the, graphite powder is one of non metal conductive material is very good.

　　Because of its special structure, graphite has special properties:

　　1) high temperature resistant: Graphite melting point of 3850 + 50 DEG C, the boiling point of 42.5 DEG C, even the ultra high temperature arc ignition, weight loss is very small, coefficient of thermal expansion is also very small. Graphite strength increases with temperature, and the intensity of graphite is increased by one time at 2000.

　　2) the conductivity of graphite is one hundred times higher than that of general non metallic mineral. Thermal conductivity over steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature, even in high temperature, graphite as insulator.

　　3) the lubrication performance of graphite is determined by the size of graphite flake, the bigger the scale, the smaller the friction coefficient, the better the lubrication performance.

　　4) chemical stability: graphite has good chemical stability at room temperature, acid, alkali and corrosion resistance to organic solvents.

　　5) plasticity: the toughness of the graphite is good, can be a very thin slice.

　　6) thermal shock resistance: graphite can withstand the temperature of the severe changes in the temperature of the temperature change and not cause damage, when the temperature is changed, the volume of graphite is not big, will not produce cracks