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

　　Graphite mold is mostly carbon, part of the air so that the graphite prone to oxidation at high temperatures, Typically graphite oxide at about 500 ℃ start, and with the graphite mold temperature increases the oxidation rate of oxidation of geometric growth intensified.Graphite mold is mainly graphite machining, and the periphery of each of the carbon atoms linked to three other carbon atoms covalently bonded to constitute a covalent molecule.

　　Graphite mold has been used following areas:

　　1. artificial graphite die for hot pressing sintering of cemented carbide has the following characteristics: if pressed when the temperature increased to 1350-1450 degrees, the pressure can be reduced to the desired unit 67- 100 kg / sq cm (that is, cold pressure of 1/10) can;

　　2. graphite mold has been successfully applied on centrifugal casting . In order to prevent the burning of artificial graphite mold, oxidation can take certain measures .

　　3. molten metal directly continuous (or semi-continuous) bar or tube manufacturing and other advanced production methods. Artificial graphite as a non-ferrous metal continuous casting or semi-continuous casting mold is considered the most suitable material.This not only greatly improve the yield, reduce scrap loss, and product quality has greatly improved.

　　4. artificial graphite material has been used successfully on non-ferrous metals pressure casting . pressure die casting production of zinc alloy and copper alloy castings artificial graphite materials have been used in automotive parts and so on.

　　5. Since the graphite material having chemical stability, less susceptible to the infiltration of molten glass, does not change the composition of the glass, good thermal shock resistance graphite material, size and other characteristics with temperature change is small, manufacture become an indispensable mold material, can be used to manufacture the glass tube, pipe, and so on.

　　6. the use of artificial graphite material minimal thermal deformation characteristics of transistors can be manufactured sintering mold and brackets, has been widely used,. the graphite mold is also used in cast iron mold, the durability of the mold with a variety of non-ferrous metals. Diamond Mold requires high material hardness and good oxidation resistance, high precision machining, using high-quality raw materials, graphite molds greatly extended life and improved oxidation resistance. Hot sintered diamond tools graphite mold, charged with the dual role of the heating element and the mold support in the diamond tool manufacturing process, graphite mold quality will directly affect the dimensional accuracy and appearance of the shape of diamond tools and so on. Under working conditions, require both heat generating element and forming a graphite mold having conductivity, high electrical resistivity, adequate mechanical strength, but also it has good oxidation resistance and long life, in order to ensure the diamond dimensional accuracy and high performance tools.