Abstract
Four types of pitch-based carbon figures have been characterised by the methods of high-angle X-ray diffraction and high-resolution electron microscopy. A 1000°C material from naptha pitch has a very poorly developed lattice structure which is much improved after treatment at 2000°C, although there is a gradation of lattice order: a few well-graphitized inclusions are also present in the 2000°C specimen. Fibres prepared from a crude-oil pitch and heat treated to 3000°C show an entangled network of well graphitized crystallites. After extension at 3000°C there is still a considerable degree of entanglement so that many crystallites lie approximately normal to the fibre axis. These may well be the cause of the low strength of the oriented material as compared with a similarly treated PAN-based carbon fibre.
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