The Effect of Defects on Surface-breakage Strength of Coke

Single coals were carbonized at different bulk densities in a pilot coke oven. DI6150, micro-strength indices and porosities of cokes were measured and polished coke samples were observed under a low magnification microscope. It is shown that the strength of coke matrix does not depend on the rank of parent coal and that the surface-breakage strength of coke is determined by defects such as non-adhesion grain boundaries and connected pores. The formation mechanism of these defects are discussed.