Microstructure Peculiarities of Carbon Materials Based
on Coal-Tar Pitch Hardened on the Surface
of Thermally Expanded Graphite Flakes

A. V. Dmitriev

Chelyabinsk State University, Chelyabinsk, 454001 Russia
e-mail: admitriev@csu.ru

Received December 21, 2012

Abstract—The structure of self-caking artificial graphite based on coal-tar pitch hardened at 225, 275, and
450C by oxidation with atmospheric oxygen on the surface of thermally expanded graphite (TEG) flakes was
studied by scanning electron microscopy. In the course of the preparation of the material after hardening, the
flakes covered with pitch were tightly compressed on grinding to molding powder in a ball mill and during the
extrusion of laboratory workpieces in a rigid matrix to result in a laminar structure of the test materials. It was
found that the caking capacity of TEG flakes and pitch layers decreased as the temperature of oxidation was
increased. The thicknesses of pitch layers and TEG flakes were estimated based on the distance between the
layers of the material.

DOI: 10.3103/S0361521913060025

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