Abstract
The effect of electric spark discharge on graphitization of carbon was investigated using three different types of heat treated carbon such as petroleum coke, pitch bonded petroleum coke carbon, and Akabira coal carbon. All these heat treated carbon samples were graphitized instantaneously by electric spark discharge with charging energy of 4600 Joule. The change of the graphitization degree was investigated by determining the interlayer spacing d and crystallite thickness, Lc and La, by X-ray diffraction. The interlayer spacing d of petroleum coke and pitch bonded petroleum coke pre-heat-treated over the range from 1000°C to 2800°C decreased to 3.36-3.37Å. Akabira coal carbons after discharge show composite (002) profiles with d spacing of 3.36Å and 3.42Å. It was found that degree of graphitization was more remarkable on the sample pre-heat-treated at lower temperature for petroleum coke and pitch bonded petroleum coke carbon, and that it was also remarkable on the sample pre-heat-treated at 1600° and 2000° for Akabira coal carbon.
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