A glass-like carbon of homogeneous structure cured up to ItXWC (GC-IO) was heat-treated under pressure of 5 kbar. The heat ~eatment was performed in two different cell a~angements; in one a~angement quasi-hydrostatic pressure was dominant and in the other there were many contact points between the carbon investigated and small angular grains of glass-like carbon heat-treated to 2080°C. In the first arrangement, the glass-like carbon did not graphitize even at 1900°C. In the second, graphitization was observed above 1750°C. Below 17WC, optically anisotropic areas were initiated at contact points with the angular $rains where the stress concentrations occur. These areas show turbostratic structure. At a little higher temperature, they transform to graphite. The graphitized parts in cross section look like bamboo leaves and grow into the bulk of the carbon at the expense of non~aphitized parts. The graphite layers were found to align ~~endicularly to the compressive stress, contrary to our previous report. The previously observed o~entation was probably due to oriented regions originally present in the starting material. The mechanism of the spreading of the graphitization from the stress concentration points at the surface is discussed.
l.INTRODUCTION