Alumina 1 Aluminum oxide 1 Carbon nanofibers 1 Carbon nanofibres 1 Condition 1 Dielectric materials 1 Electric discharge machining 1 Electric discharges 1 Electrical discharge machining 1 Hard material 1 Machining performance 1 Machining rate Machining surfaces 1 Micro electrical discharge machining 1 Micromachining 1 Powders 1 Silicon powders 1 Surface roughness 1 Tungsten carbide 1 Ultrafine particle 1 alumina 1 carbon nanofiber 1 micro-EDM 1 silicon 1 tungsten carbide 1