The density of isostatic graphite is typically high, often aiming to reach less than 1% porosity. This high density is achieved through a manufacturing process known as isostatic pressing, which involves compressing the raw material mixture into blocks using a Cold-Isostatic-Press (CIP). This method allows for the production of graphite with a very high degree of isotropy and small grain sizes, which contributes to its high density.
The process of isostatic pressing is crucial for achieving high density in isostatic graphite. In this process, the graphite powder is subjected to uniform pressure from all directions, which helps in achieving a more uniform and dense structure compared to other pressing methods like uniaxial pressing. This uniform pressure distribution ensures that the graphite is compressed evenly, minimizing porosity and maximizing density.
The theoretical maximum density of randomly stacked perfectly spherical mono-modal particles is only 64%, but with the application of significant force through isostatic pressing, packing densities of over 90% can be obtained. This high density is essential for the superior mechanical and thermal properties of isostatic graphite, making it suitable for applications where other types of graphite are inadequate.
In summary, isostatic graphite is characterized by its high density, which is achieved through the process of isostatic pressing. This high density is a key factor in its excellent mechanical and thermal properties, making it a preferred material for advanced applications.
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