Behavior of Spherulite (Meso-Carbon Microbeads) During Carbonization of Coal-tar Pitch

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Abstract
At the early stage of carbonization of coal-tar pitch, a lot of small anisotropic sphere has been occured. According to rise of heating temperature, they have grown to 20-30μ in diameteer, combined then with each others, begun to flow, and finally solidified forming manifold coks-structures. It is therefore, considered that behavior of sphere must decisively influence on coks structure obtained.To advance the present knowledges about behavior of sphere, morever, following examinations are carried out;Optical character of this sphere reinvestigated under the transmitted-reflected microscope, using polished thin section of sphere isolated by quinoline.For getting new information about physical structure of sphere, spherules etched by heated quinoline are investigated under micro-interference microscope.Coks-structures are also examined under the scanning microscoppe.

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