Fundamental Studies on Texture and Property Control in Carbon Materials

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1. Formation and control of textureNew classification of microtexture in carbon materials based on crystallite orientation was proposed. By carbonizing the mixtures of pitch with phenol resin or polyvinylchloride under pressure, optical texture of the resultant carbons and particle morphology can be controlled in a wide range. Rheological parameters of pitches depend strongly on their molecular weight and change remarkably by mixing with carbon black particles.2. Fracture behaviourCarbon materials show remarkable non-linearity during crack propagation. This non-linear fracture behaviour is analyzed on the basis of energetics and the experimental determination technique of various fracture parameters was established. Energy dissipation during crack propagation is mainly due to microcracking, and very large size process zone and process zone wake has to be taken into account for the analysis of fracture behaviour of carbon materials. Microcracking depended strongly on texture and so on the heat-treatment temperature and size of filler coke particles in the carbon materials.3. Electrode reactionVarious carbon fibres ( vapor-grown, mesophasepitch based and PAN based fibres ) with various heat-treatment temperatures are used as electrode in concentric sulfuric acid. Intercalation and de-intercalation of sulfuric acid into graphite layers in the carbon fibres depended not only on the crystallinity of the fibre but also on the microtexture in the fibre; well-oriented texture being preferable for intercalation and de-intercalation.