Densification and Forming

The so-called green mixture is heated to a temperature Just above the softening point of the binder and introduced into the form in which it is later to be fired. In almost all forming processes it is simultaneously densified to obtain dimensional accuracy, avoid cavities and prevent cracking during firing. During densification orientation of the anisotropic coke particles occurs in the direction of the 

Unsintered formed articles are produced under pressure at temperatures just above the softening temperature of the binder 

Extruders are generally used, although the number of vibrating compressors has increased in recent years, not least because unsintered molded articles with lower binder contents are easier to fire. Isostatic pressing is suitable for quasi-isotropic unsintered formed articles. 

Complete firing can take several weeks. Pyrolysis gases make up ca. 30% by weight of the binder 

Firing of the unsintered formed article to carbon articles is carried out at temperatures between ca. 800 and I300°C, utilizing gas or oil heating  

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