Comparative Studies of Edm Process Conductive Layer on Silicon Nitride With Brass and Copper Electrodes

Abstract

Insulating materials are now subjected to precision electrical discharge machining (EDM) using an assisting electrode method (AEM). The electrode materials usually comprise copper, graphite and copper alloys that have high melting temperature and excellent electrical and thermal conductivity. A brass electrode is known as a humble electrode. Performances of brass and copper pipe electrodes were compared on silicon nitride machining. Results showed that a brass electrode had more advantages than a copper electrode. Material removal rate (MRR), electrode wear ratio (EWR) and surface roughness were compared, while the conductive layers were examined by a scanning electron microscope (SEM) energy dispersive spectrometer (EDS).

Investigation into Optimizing of Machining Parameters using RSM for Si3N4 -TiN Ceramic C omposites by WEDM

“…Consistent with the findings of this investigation, Luckas et al concluded in his experimental work on Inconel 718 (16) , that zinc-coated brass electrode offers better cutting rates than conventional bare brass electrode. Consistent with the results of the present investigation, Muttammara et al (21) and Selvarajan et al (13) have deduced from their research that the primary factor influencing cutting rates is current, which is attributed to its effect on width of cut.…”