Optical emission spectroscopy of electrical discharge machining plasma

Employing Ti nano-powder dielectric to enhance surface characteristics in electrical discharge machining of AISI D2 steel

“…11 schematically illustrates the surface formation in EDM before and after adding powder to the dielectric. Since impurities contaminate the plasma channel in the EDM gap [21], the discharge process and plasma channel formation are influenced by the addition of conductive powder to dielectric. Is well-established that adding powder to dielectric increases the dielectric constant (K), resulting in discharge gap expansion.…”

“…Ti deposition increased the surface hardness by 76% due to the development of a TiC layer on the machined surface, which filled and substituted the surface micro-cracks with Ti atoms from the powder and carbon atoms from dielectric decomposition. However, it is acknowledged that besides C atoms, dielectric breakdown during discharge also releases C2 molecules [21]. Furutania, Saneto, Takezawa, Mohri and Miyake [17] achieved a 150 m TiC layer with 1600 Hv hardness as an outcome of the Ti atoms' reaction with C on the workpiece surface due to discharge-generated heat.…”

Ferromagnetic Properties of Hybrid Cementite and Diamond Nanocomposite

“…The pulse-on frequency increases until it reaches 30 μs, at which point ferromagnetic behavior is exhibited. When the pulse-on frequency is over 30 μs, the local surface is heated, melting the diamond [24]. The value of magnetization is within 0.1~0.5 mA/m 2 for sample 4, as show in Fig.…”

Theoretical modeling of energy balance in electroerosion

“…EDM plasmas in the column region are essentially non-ionized hydrogen plasmas [9]. As the ionization energies of cathode metal vapors are lower than hydrogen ionization energies, we suppose that the cathode voltage drop and thus the terms in Eq.…”