Abstract
The effect of discharging energy on graphitization of carbon caused by spark shock was investigated. Three different types of heat treated carbons, petroleum coke carbon, pitch-bonded petroleum coke carbon and Akabira coal carbon were used for this purpose. The change in the graphitization degree was investigated by X-ray diffraction by determining the interlayer spacing fd, and the crystallite thickness L c . The X-ray diffraction profiles of lines showed for specimens shocked by electric spark discharge of the highest discharging energy a sharp and strong (002) peak, although for those shocked by lower discharging energy showed a composite (002) peak. The interlayer spacing d(002) for the specimens shocked with the discharging energy as high as 4600 J decreased to about 3·36Å. It was found that the increase in degree of graphitization by electric spark discharge was greater when the discharging energy increased. Electron micrographs of the specimens shocked by the discharge of highest energy show some laminar crystals having similar appearance to natural graphite.
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