Abstract
Bonding between binder and filler cokes in an experimental anode carbon, made using a coal-derived filler coke and a normal electrode-binder pitch, was investigated using scanning electron microscopy. The surface of each filler coke particle was found to contain rough and smooth areas formed respectively by breakage of the coke matrix during crushing and devolatilization pore formation during coal carbonization. Good bonding, indicated by continuity of structure, could be achieved between the fracture surfaces and granular or suitably aligned lamellar binder coke. Inadequate binder-filler bonding at smooth pore surfaces was evident by shrinkage fissures at the interface. The findings are explained in terms of the structures of the various types of carbon and the availability of edge carbon atoms for bond formation.
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