Abstract
The low thermal expansion coefficient is an important factor in determining the quality of calcined coke for the manufacturing of artificial graphite electrodes. A new calcining technology has been developed to lower the thermal expansion coefficient considerably less than the traditional methods at the calcining stage of green coke. The results obtained from calcining various types of green coke revealed that this technology is effective towards all types of green coke. From the experimental results, it was found that the development of unique microcracks appeared in the coke after calcination, affected by the heating pattern applied by the new calcination method. It was pointed out that these microcracks absorbed and relaxed the expansion of crystallites to result in a reduction of the thermal expansion coefficient of the coke.
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