Abstract
Carbonization and graphitization of virgin reduced crude and coal tar pitch were studied with a polarized-light microscopic method, X-ray diffraction, and densimetric measurement. Coal tar pitch heat-treated at 420°C shows irregular mesophase spherules, which are covered by fine particles of insoluble matters. The spherules in coal tar pitch show the stacking defects.On the other hand, coal tar pitch with insoluble matters removed by hot-filtration and virgin reduced crude with or without removal of insoluble matters have a clean surface of spherules in various sizes at the same temperature range of heat treatment.Removal of insoluble matters from parent carbonaceous materials results in a noticeable effect on forcing of alignment of crystallites together with crystallites growth at the graphitization temperature.
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