Extruded graphite and isostatic graphite are two different types of artificial graphite with distinct characteristics and manufacturing processes.
5 Key Points to Know About Extruded and Isostatic Graphite
1. Manufacturing Process
Extruded graphite is produced through an extrusion process. This involves forcing a mixture of graphite and binders through a die to form the desired shape.
Isostatic graphite is produced through a process called Cold-Isostatic Pressing (CIP). In this method, the raw material mixture is compressed into rectangular or round blocks using a Cold-Isostatic-Press.
2. Grain Size and Structure
Extruded graphite has a coarser grain size compared to isostatic graphite. This coarser grain size results in lower strength but higher thermal and electrical conductivity.
Isostatic graphite is known for its ultra-fine grain structure. This ultra-fine grain size contributes to its high strength, excellent resistance to thermal shock, and low electrical resistance.
3. Mechanical Properties
Extruded graphite has lower strength. However, it exhibits higher thermal and electrical conductivity.
Isostatic graphite has excellent mechanical properties. It is highly valued for its high strength, resistance to thermal shock, and low electrical resistance.
4. Applications
Isostatic graphite finds applications in various industries. These include nuclear, metallurgical, semiconductor, solar, continuous casting, and EDM.
5. Isotropic Form
The isostatic pressing process allows for the most isotropic form of artificial graphite. This results in small grain sizes and a homogeneous structure throughout the material.
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