Abstract
As previously reported , several insulating ceramics such as Si_3N_4, SiC and ZrO_2 have successfully been machined by EDM. As unstable discharges occur during the machining of Al_2O_3 ceramics, inferior machining properties have been obtained as compared to other ceramics. In this study, semi-sintered graphite electrode and copper infiltrated graphite electrode were carried out on 95% of alumina. Graphite and graphite plus copper electrode improved machining rate.
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