EFFECT OF GRANULAR COKE SPECIES ON THE COMPRESSIVE STRENGTH OF PITCH-BASED CARBON COMPOSITES

摘要

The pitch-based carbon composites (PCCs) that were reinforced by three kinds of coke particles such as metallurgical coke, pitch coke □ and pitch coke □ were prepared successfully under atmospheric environment using an ordinary hydraulic pressure machine by the new mould pressing and semi-carbonization shaping technology. The as-fabricated PCCs were treated in turn by way of quick baking, one-time densification and graphitization at 2373 K and three correspondent samples are achieved. The effect of the species of granular cokes on compressive strength of PCCs was studied in detail. Results show that the compressive strength of PCCs is closely related to the surface states, microstructure and compressive strength of coke particles. The higher compressive strength, the coarser surface and the more open pores of coke particles demonstrate more remarkable reinforcement to the composites. The PCCs can be achieved through three ways of baking, densification, and graphitization and the PCCs that are fabricated using metallurgical cokes as reinforcement possess the highest compressive strength during each process. Three correspondent strengths are 153.2MPa, 180.3MPa, and 83.5MPa. However, the three strengths of PCCs that are fabricated with pitch coke □ come next and they are 81.2MPa, 142.6MPa, and 76.9MPa. Last come the three strengths of PCCs that are obtained through pitch coke □ and they are 41.6MPa, 102.6MPa, and 38.6MPa.