Anisotropy of Needle Cokes

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Abstract
The anisotropic properties of several lump needle cokes were studied by means of a X-ray diffractometer, a dilatometer, and a reflected microscope in order to evaluate the anisotropic factors of the needle cokes and to discuss the relations among them. Among them several relations were found, which were well understood on the basis of the structure of the uniaxial arrangement of the crystallites. The change in these factors upon heat treatment was also investigated in order to find how these factors depended on the crystal-growth of the needle coke. Some anisotropic properties of the extruded sample were compared with those of the filler coke, which were observed in a lump shape. The results indicate that the extruded sample had its anisotropic properties considerably lowered. The structure and crystal-growth of the needle cokes are discussed based on these observations.