Isostatic graphite is a specialized type of graphite known for its superior properties, making it ideal for various industrial applications. The manufacturing process of isostatic graphite involves several critical steps. Here’s a detailed look at each step:
7 Key Steps in Isostatic Graphite Manufacturing
1. Coking
Coke is the initial raw material used in the manufacturing process. It is produced by heating hard coal in a specially designed coke oven.
2. Isostatic Molding
A mixture of coke and pitch is compressed into rectangular or round blocks using a Cold-Isostatic-Press (CIP). This process applies uniform pressure on all sides, eliminating porosity without changing the net shape of the material.
3. Heat Treatment
The molded blocks are then heat-treated at temperatures ranging from 2500-2800°C. This step helps to further strengthen the graphite and achieve the desired physical properties.
4. Machining
Once the material is ready and inspected, it can be machined according to customer documentation. This step involves shaping the graphite into the desired form or dimensions.
5. Purification
In some industries, such as semiconductor, silicon monocrystalline, and atomic energy, high purity is required. Impurities are removed through chemical methods. A common practice is to expose the graphitized product to a halogen gas and heat it to around 2000°C.
6. Surface Treatment
Depending on the application, the surfaces of the graphite can be milled and made smooth.
7. Shipment
After final machining and surface treatment, the finished graphite details are packed and sent to the customer.
Isostatic graphite is known for its high strength, excellent resistance to thermal shock, high temperature and oxidation resistance, low electrical resistance, good corrosion resistance, precise machining, and low impurity content. It is an ultra-fine grain graphite that is used in applications where the mechanical properties of other fine grain graphites are inadequate. Compared to other manufacturing technologies, isostatic graphite production can achieve the most isotropic form of artificial graphite with small grain sizes.
Overall, the manufacturing process of isostatic graphite involves the preparation of coke, isostatic molding, heat treatment, machining, purification, surface treatment, and final shipment. Each step contributes to the production of high-quality isostatic graphite with specific properties and characteristics suitable for various industrial applications.
Continue Exploring, Consult Our Experts
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