High purity graphite generally refers to the amount of carbon containing more than 99.99% of graphite in the organizational structure can be divided into three categories: coarse grain structure, fine grain structure and fine grain structure. The base material for integrated circuits is mainly single crystal silicon chip, silicon single crystal growth process is currently mainly used in Czochralski (CZ) method, and other methods of magnetic Czochralski method (MCZ), regional (FZ) method and double crucible pulling method, the total amount of single crystal silicon 80% monocrystalline silicon with the global electronics industry. Czochralski graphite furnace is monocrystalline silicon using consumables, high purity graphite materials into the heating system of monocrystalline silicon furnace. In 2005 China needs to be directly drawn silicon single crystal furnace with graphite about 800 t. [1]

　　Another important use of high purity graphite is processed into various kinds of crucible, used for the production of precious metals, rare metals or high pure metal, non-metallic materials. Graphite electrode is also a kind of high purity graphite, which can be used for the spectral analysis of all elements except for carbon. The impurity content of finished product should be less than 6*10 were prepared by chemical method and standard sample collection for impurity spectrum of pure carbon powder or graphite pure spectrum in spectrum analysis, the two kinds of high purity materials of impurity content requirements are at 6 *10; in some cases, to the carbon content reached 99.9995% the total ash content of less than 5 *10. The molding methods of high purity graphite include three kinds of forming methods, such as extrusion, molding, and static pressing. Table 9 the physical and chemical properties of high purity graphite products made in China

　　The isostatic pressing graphite technology is a kind of super high pressure hydraulic equipment,and its working principle is that products formed under the condition of equal pressure and high pressure in all directions and closed high-pressure container . The working principle of the isostatic pressure is Pascal's Law: "the pressure of the medium (liquid or gas) in the closed vessel can be transferred to all directions equally." Isostatic pressing technology has had 70 years of history, was used in the powder molding of powder metallurgy initially . In the past 20 years, the isostatic pressure technology has been widely used in many fields such as ceramic casting, atomic energy, tool manufacturing, plastics, super high-pressure sterilization of food and graphite, ceramics, permanent magnet, high voltage electricity magnetic insulator, preparation of biological medicine, food preservation, high performance material, military and other fields.

　　The isostatic pressing technology is divided into three kinds of different types such as cold isostatic pressing, temperature isostatic pressing and hot isostatic pressing according to the temperature of the forming and solidification .

　　The cold Isostatic Pressing, CIP for short,it is at room temperature, rubber or plastic are used for package sets of mould material, and a liquid is used for pressure medium,the technology is mainly used in powder material compaction, it provide green body for further sintering, forging or hot isostatic pressing process usually. General application pressure is 100~ 630MPa.

　　The temperature isostatic pressure technology, the pressing temperature is generally in the 80 ~ 120 ℃ ,some are also in 250~450 ℃, it transfer the pressure by special liquid or gas , the application pressure is 300MPa. It’s mainly used in graphite,polyamide rubber and other powder materials which can not be molded in room temperature so that we can obtain a solid body at an elevated temperature.

　　The hot isostatic pressing，HIP for short, it is a technology which make material to go through isostatic pressing under the high temperature and high pressure at the same time, It is not only used for powder consolidation and two step work of traditional powder metallurgy forming and sintering are completed together,but also for diffusion bonding of the workpiece, the elimination of casting defects, and complex shape parts production. In hot isostatic pressure, it generally use argon, ammonia and other inert gas as the pressure transfer medium, the package of materials are usually used in metal or glass. Operating temperature is generally 1000~2200℃, the working pressure is often 100~200MPa.

　　　Czochralski silicon single crystal thermal field in the pulling of monocrystalline silicon and polysilicon ingot furnace with heater in thermal field, isostatic pressing graphite parts have crucible crucible, heater, electrode, insulation shield, seed crystal holder, rotating with the base of the crucible, all kinds of round board, thermal baffle, about 30 kinds. Among them, 80% of the isostatic pressing graphite used in the manufacture of crucible and heater, etc. In recent years, the diameter of the requirements of single crystal silicon rod is more and more big, 300 mm wafer production has increasingly become the mainstream. Accordingly, the single crystal furnace heating zone, most of the 800 mm diameter, the graphite crucible furnace in order to protect the place of the quartz crucible, up to 860 mm in diameter, heater is about 960-1000 mm in diameter, the diameter of the other components in some maximum up to 1500 mm. Since 2003, the people of the earth's living environment protection consciousness gradually strengthened, people more and more favour not the natural energy of carbon dioxide. Under this trend, the solar cell production increase. In the process of solar cells, polycrystalline silicon chip manufacturing, must first to polysilicon pieces fused into polycrystalline silicon ingot. The ingot furnace isostatic pressing graphite heater needs to be used to make. 2.2 nuclear power industry in recent years, the global climate warming. People think that carbon dioxide produced by the use of fossil fuels is the leading cause of the problem.

　　In recent years, although the economic growth of developing countries have made remarkable achievements, but the problem of insufficient power deeply disturbed in these countries. In such cases, people's eyes turned to the energy flow density is much higher than solar and wind power, and do not emit carbon dioxide and sulfur oxide nuclear power generation. At present, the world has been put into use nuclear reactors are mostly is given priority to with light water reactor. This DuiXing working principle is to use nuclear cracking when the heat energy to the cold water gasification is 300 ℃ water vapor, drive a turbine to generate electricity. However, due to water reactor temperature is low, the power generation efficiency of light water reactor is not too high. Compared with high temperature gas cooled reactor has no such problem. It is coolant with inert gas (helium), not only the core outlet temperature can reach 1000 ℃, power generation efficiency is high, also suitable for manufacturing hydrogen. Can be said to be the power supply and environment protection. Graphite for this kind of high temperature gas cooled reactor core material, because of graphite not only high temperature resistant, and less to absorb neutrons, good heat transfer. Almost inexhaustible fusion fuel and material resources, the release of the reaction energy is very huge. To make a fusion of for a long time we have to maintain plasma at a certain temperature. Graphite is a fusion plasma maintain an indispensable material.

　　In order to shorten the production process, reduce the cost, improve the quality, reduce the labor intensity and pollution to the environment, the metal material production gradually to the continuous casting direction in 20 years.

　　So far, the basic realization of the copper, aluminum production, high purity graphite, steel production has reached more than 80% (but most of the mold is not using graphite).

　　Isostatic graphite is mainly used for large copper production line. Since 1985, our country from Austria, France, Switzerland, Japan and other countries has introduced more than 30 production lines, and to design our own manufacturing production line has reached more than 100, using graphite crystallizer.

Graphite for electrical discharge machining

　　Electric spark machining is a revolution in the die and mould industry. It not only simplifies the traditional process, but also makes it possible to make a shaped mould. Because of the isotropic, the graphite electrode is the best material for the manufacture of electric spark graphite electrode.

Graphite material for the production of quartz crystal silicon

　　The quartz crucible is a container of a single crystal silicon, and the graphite crucible is used as a molding material in the manufacture of quartz crucible.

　　In addition to the main purposes, such as static pressure graphite is widely used in the field of hard alloy (vacuum oven heater, sintered plate, etc.), mining (bit mould manufacturing), chemical (for heat exchanger and anticorrosive parts), metallurgy Qian Guo, machinery, mechanical seal), space (nozzle), graphite reactor (deceleration material and reflective material) etc..

　　Electrical discharge machining (EDM) with the advantages of graphite and copper electrode than graphite electrode, the proportion of graphite is 1/5 of the copper, the weight of the same volume of graphite copper relatively light for 5 times. Easy to manufacture large mould; Graphite processing speed, generally 3 ~ 5 times faster than ordinary metals, can reduce the tool wear and the electrode loss; Graphite high melting point and easy not deformation, don't have to worry about because of high processing through deformation and damage of components; Graphite in processing after the completion of the polishing processing generally don't have to. To reduce the error and shorten the production cycle. Graphite electric cremation processing speed and low dissipation factor, as long as well with reasonable processing parameters, the zero loss on the graphite electrode can be theoretical, reduce the number of repeated electrode processing.

　　Because of graphite material is copper material has the advantage, at present, many mold factory are converted into graphite processing, so as to shorten the delivery time of products to enhance competitiveness in the market. Europe's current electricity cremation processing with the ratio of graphite and copper, lo and the Chinese market is 3:7, along with the rise in copper prices and technological progress, the proportion of using graphite will continue to rise, therefore, our country of graphite used for edm great development space. During the period of "15" mold market demand is very prosperous, foreground is very good, Beijing Greatwall Co.,Ltd. will provide better products and services. In the current mould has become a bottleneck of many industry development situation, such as to better meet the needed for the development of national economic sectors, "15" during the mold output each year, about 15% of the growth, upgrading the machinery manufacturing equipment and manufacturing technology level enhancement, to precision mold development, develop in the direction of large, complex, long-life, multi-functional composite die will further development, therefore, request graphite material in "specifications on large-scale, granularity composition, ultrafine particles using on flexural capacity strengthened".

Solar battery and semiconductor wafer with graphite: photovoltaic industrial graphite materials: as a result of the isostatic pressing graphite materials have high strength, density, isotropic, made of graphite parts in use process heating, heating is even, at the same time due to the density of material evenly can effectively reduce material by thermal shock and produce the internal stress of thermal shock resistance (good), so it can greatly prolong the service life of equipment or instruments cycle, so in the semiconductor and solar industries, used the isostatic pressing graphite (isotropic graphite), making Cz type monocrystal pulling of graphite furnace thermal field components (crucible, heater and diversion tube, cover, etc.); Polycrystalline silicon smelting furnace heater,; Compound semiconductor manufacturing with heater, crucible, etc. Belongs to the high-quality goods of graphite materials, such as static pressure graphite with other ordinary graphite have excellent performance, is a hot field in polycrystalline silicon, monocrystalline silicon manufacturing refractory material of choice for basic materials. Fast development of solar photovoltaic power generation, nearly 10 years, the global solar photovoltaic industry average annual growth rate of 41.3% despite the economic crisis of 2009 attacks, too can industry remains more than 30% of global growth, after the Copenhagen climate BBS, will have a bigger development space, is expected to begin in 2010 will have an annual 50% ~ 60% of the global solar market grows.

　　China as the world's largest producer of solar photovoltaic (pv), whose share has reached 70% of the world, the consumption of industry in 2009 reached more than 5000 tons of high-grade graphite materials, are expected annual demand for isostatic pressing of graphite materials to increase at a speed of 25 ~ 30% on average, pv industry a huge demand for graphite monocrystalline silicon and polycrystalline silicon production, CFCCARBON will provide better products and services. The development of clean energy, the demand of the market and policy support, below is the most favorable conditions in the development of industry. Large size, high purity, high density, high strength, such as static pressure (isotropic) graphite materials are electronic and photovoltaic industry development needs, during the \"twelfth five-year\" will be the development of the isostatic pressing graphite manufacturing companies in China the best opportunity.

　　At present, the single crystal size to normalize development, a few years ago the prevailing 18-inch furnace 20-inch furnace quickly replaced in 2010 ~ 2011 years, and the bigger the trend of the development of the specification; Polysilicon is the large-scale development, in addition, polysilicon access rules is still under discussion, is the development direction of high-end products. Photovoltaic industry products of large-scale and high normalized, determines the has higher request to the graphite, i.e., more specifications, higher strength, higher purity.