Extruded graphite and isostatic graphite are two different types of artificial graphite with distinct characteristics and manufacturing processes.
Extruded graphite is produced through an extrusion process, which involves forcing a mixture of graphite and binders through a die to form the desired shape. This process results in a coarser grain size compared to isostatic graphite. While extruded graphite has lower strength, it exhibits higher thermal and electrical conductivity.
On the other hand, 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. Isostatic graphite is known for its ultra-fine grain structure and excellent mechanical properties.
The key difference between extruded graphite and isostatic graphite lies in their grain size and properties. Extruded graphite has a coarser grain size, which results in lower strength but higher thermal and electrical conductivity. Isostatic graphite, on the other hand, has an ultra-fine grain size, which contributes to its high strength, excellent resistance to thermal shock, and low electrical resistance.
In terms of manufacturing process, extruded graphite is produced through extrusion, while isostatic graphite is produced through Cold-Isostatic Pressing. The isostatic pressing process allows for the most isotropic form of artificial graphite, with small grain sizes and homogeneous structure throughout the material.
Isostatic graphite finds applications in various industries, including nuclear, metallurgical, semiconductor, solar, continuous casting, and EDM. It is highly valued for its high strength, resistance to thermal shock, high temperature and oxidation resistance, low electrical resistance, good corrosion resistance, precise machining, and low impurity content.
In summary, the main difference between extruded graphite and isostatic graphite lies in their grain size and properties. Extruded graphite has a coarser grain size, lower strength, and higher thermal and electrical conductivity. Isostatic graphite has an ultra-fine grain size, high strength, excellent resistance to thermal shock, and low electrical resistance. Isostatic graphite is produced through Cold-Isostatic Pressing, allowing for the most isotropic form of artificial graphite with small grain sizes and homogeneous structure.
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