Isostatic graphite is a special type of graphite made through a method called isostatic pressing.
This technique compresses a blend of coke and pitch into blocks, either rectangular or round, using a Cold-Isostatic-Press (CIP).
Compared to other molding methods, isostatic pressing creates the most uniform form of artificial graphite.
This means it has the same properties in all directions.
Isostatic graphite is perfect for advanced equipment because it has many great features.
It is strong, resists sudden temperature changes well, and can handle high temperatures and oxidation.
It also has low electrical resistance, is resistant to corrosion, and can be machined very precisely.
Plus, it has very few impurities, so it can be made with high purity.
What is the Process of Isostatic Graphite? 7 Key Steps Explained
1. Production of Coke
The process starts with making coke.
This is done by heating hard coal in a special oven designed for coke production.
2. Mixing Coke with Pitch
The coke is then mixed with pitch.
Pitch is a sticky substance that helps hold the coke together.
3. Isostatic Pressing
The mixture of coke and pitch is compressed using the isostatic pressing technique.
This pressing method ensures the graphite has uniform properties in all directions.
4. Heat Treatment
After pressing, the blocks are heat-treated at extremely high temperatures, between 2500-2800 °C.
This step further enhances the properties of the graphite.
5. Purification (Optional)
For certain applications, like those in the semiconductor and atomic energy industries, purification is necessary.
This involves removing impurities by exposing the graphite to halogen gas and high temperatures.
6. Surface Treatment (Optional)
Surface treatment, such as milling, can be done to achieve smooth surfaces on the graphite.
This step is important for applications requiring precise surface finishes.
7. Final Inspection and Shipment
Once the graphite is ready, it undergoes a final inspection.
It is then machined according to customer specifications and shipped to the customer.
Isostatic graphite is used in many industries, including nuclear, metallurgical, semiconductor, solar, continuous casting, and EDM.
Its high thermal and chemical resistance, excellent thermal shock resistance, and high electrical and thermal conductivity make it ideal for these applications.
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