What is isostatic graphite?

Isostatic graphite is a type of graphite with an ultra-fine grain. It is used for applications where the mechanical properties of other fine-grained graphites are inadequate.

Isostatic graphite is manufactured by taking a fine grain graphite powder blend and placing it in a hot isostatic press. The isostatic pressure is applied uniformly on all sides, eliminating porosity without changing its net shape. So, it is also known as Isographite or Isotropic Graphite.

Isostatic graphite has some excellent properties as follows:

• Good heat resistance, in an inert atmosphere, with the increase in temperature its mechanical strength increases, reaching a maximum value at about 2500 ℃;
• Compared with ordinary graphite, it has good homogeneity and fine and dense structure;
• Low coefficient of thermal expansion, good resistance to thermal shock;
• Isotropic, consistent performance in all directions;
• High chemical resistance, able to withstand penetration erosion of molten metal and glass;
• Good electrical and thermal conductivity;
• Excellent machinability, can be processed into almost any shape.

Therefore, isostatic graphite is widely used in the production of CZ-type single crystal direct-drawing furnace hot field graphite parts (crucibles, heaters, deflectors, heat preservation cover, etc.), polycrystalline silicon melting furnaces, compound semiconductor manufacturing heaters, crucibles and other components, rocket ignition poles, excitation poles, nozzles and rudder boards, the core structure of nuclear reactors, electrical discharge machining electrodes, continuous casting of metal with graphite crystallizers and so on.

Semicorex manufactures with high-quality specialty graphite. If you have any inquiries or need additional details, please don't hesitate to get in touch with us.

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