Isostatic Pressing Molds for Isostatic Graphite

Isostatic Pressing Molds for Isostatic Graphite

Isostatic graphite is a new type of graphite material developed in the 1960s, which has a series of excellent properties. For example, isostatic graphite has good heat resistance. In an inert atmosphere, its mechanical strength not only does not decrease as the temperature increases, but increases, reaching the highest value at about 2500 ° C; compared with ordinary graphite, the structure Fine and dense, and good uniformity; low thermal expansion coefficient, with excellent thermal shock resistance; isotropic; strong chemical corrosion resistance, good thermal and electrical conductivity; excellent machinability.

It is precisely because of this series of excellent properties that isostatic graphite is widely used in the fields of metallurgy, chemistry, electrical, aerospace and atomic energy industries, and, with the development of science and technology, the application field is still expanding.

Different from ordinary extrusion molding and compression molding, isostatic graphite is formed by cold isostatic pressing technology. Fill the raw material compressed powder into the rubber mold, and make the compressed powder dense through high-frequency electromagnetic vibration, vacuumize after sealing, discharge the air between the powder particles, and put it into a high-pressure container filled with liquid media such as water or oil. Pressurize to 100-200 MPa and press into cylindrical or rectangular products.

According to Pascal's principle, the pressure is applied to the rubber mold through a liquid medium such as water, and the pressure in all directions is equal. In this way, the pressed powder particles are not oriented in the filling direction in the mold, but are compressed in an irregular arrangement. Therefore, although graphite is anisotropic in crystallographic properties, as a whole, isostatic graphite But isotropic. In addition to cylinders and rectangles, the formed products also have shapes such as cylinders and crucibles.

Isostatic pressing machine is mainly used in powder metallurgy industry. Due to the needs of high-end industries such as aerospace, nuclear industry, cemented carbide, and high-voltage electromagnetics, isostatic pressing technology has developed very rapidly, and has the ability to manufacture cold isostatic pressing machines with a working cylinder inner diameter of 3000mm, a height of 5000mm, and a maximum working pressure of 600MPa. . At present, the maximum size of the cold isostatic press used in the carbon industry to produce isostatic graphite is Φ2150mm×4700 mm, and the maximum working pressure is 180MPa.

ISO Molds for Isostatic Pressing Graphite

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