Abstract
Coal is a complicated mixture, which consists of inorganic matters and organic matters. Therefore, coke formed through pyrolysis of coal is also a complicated mixture. On the other hand, there are many reports for the relation between carbon structure of coke and the strength, and the carbon structure of bulk coke is used experientially as one of index for evaluation of coke quality. It is important for an essential understanding to get information based on the each microstructure because of complexity of coke. In this study, the technique of sampling arbitrary tiny parts was developed, and the carbon structure of the tiny coke partial was analyzed. Consequently, it was revealed that high quality coke had uniform carbon structure, but the structures of inferior coke were heterogeneous. It was recognized that crystallinity of coke is influenced by the kind of mineral matter and its distribution in addition to the type of organic matter such as soft carbon and hard carbon.
