Abstract
The degree of graphitization of coke is increased at higher temperature than the carbonization temperature. As the heat treatment temperature (H. T. T.) increase, the three dimension crosslinkage of layers develope to the second dimensional graphite like net structures (so called the turbostratic ones) and finally the graphite crystal structure is completed. The physical and chemical properties of coke is reviewed in the coures of graphitization at high temperature:
1) The most properties of coke is highly dependent on the H. T. T.
2) The higher H.T.T. cause the reduction of hetero atoms (S. N. P. H) making coke inert but the ash components behave sometimes as catalysts to increase the reactivity of coke at higher than 1700°C.
3) The electromagnetic properties of coke show clearly the progress of the graphitization when the H. T. T. increasing.
4) The mechanical properties of coke: The intrinsic strength, determined with such as knoop hardness, is reduced as the higher temperature. On the other hand, the structural strength is high below the carbonization temperature and over the carbonization temperature it become weak mainly due to the shrinkage.
