Mechanism of spark generation during electrochemical discharge machining: a theoretical model and experimental verification

Parametric analysis on electrochemical discharge machining of silicon nitride ceramics

“…A non-conducting ceramic workpiece is placed in the closed vicinity of the electrical discharge, and the material of the workpiece is melted, vapourised and eroded due to the transmission of a fraction of spark energy to the workpiece. This raises the temperature of the region dramatically, and a part of the molten portion of the workpiece is removed due to the mechanical shock resulting from the sudden phase change and the electrical spark discharge [4][5][6][7]. Additional material removal also takes places due to thermal spalling [8,9].…”

Micromachined glass apertures for artificial lipid bilayer formation in a microfluidic system

“…For instance, in order to produce an aperture with a diameter of approximately 100 µm through a 100 µm thick glass coverslip, the tool electrode was moved downwards at a continuous rate, from 10 µm above the surface to 80 µm below over a period of 30 s. By varying the rate at which the tool electrode is lowered, its final vertical position and the length of time between the emergence of the initial aperture opening and the shutting off of the power supply, different aperture diameters and aspect ratios may be obtained using the same tool electrode: the faster the descent and the faster the cut-off, the shallower and smaller the resulting aperture. Other parameters such as electrode dimensions, temperature, electrolyte concentration, applied voltage and current limitation were not varied during this work but these factors have been well studied elsewhere and could be optimized if required [16][17][18][19][20].…”

“…A potential of 25-50 V is applied between the tool electrode (cathode) and a counter electrode (anode), resulting in electrolysis at both electrodes, with H 2 being generated at the cathode and O 2 at the anode. If the applied voltage is above the critical voltage of the system (which is dependent upon the electrolyte concentration and the tool electrode material and geometry [16]), the rate of electrolysis at the tool electrode will be high enough to produce such a density of bubbles that they coalesce to form a gas film, thus separating the electrode from the electrolyte [19,20]. The electric field in this gas film will be sufficiently high to cause electrical discharges from the electrode to the electrolyte.…”

Prediction of Material Removal Rate using Regression Analysis and Artificial Neural Network of ECDM Process

“…The mechanism of spark generation during ECDM process was investigated by Basak and Ghosh [1].They developed an experimental setup to machine non-conductive materials and proposed a theoretical model. Using theoretical model, critical parameters like voltage and current are estimated and noticed that the discharge phenomenon is corresponding to a control of an electric circuit.…”