Method for modifying an electrically non-conductive workpiece via spark erosion

摘要

The present invention relates to a method for modifying an electrically non-conductive workpiece via spark erosion. The inventive method comprises the following steps: a) providing a workpiece comprising an electrically non-conductive surface; b) providing a first working electrode facing the workpiece at a region to be modified such that a gap is provided between the workpiece and the first working electrode; c) providing a dielectric comprising conductive particles, wherein the conductive particles are obtained via a burn-off from a second working electrode in a dielectric liquid; d) flushing the dielectric comprising the conductive particles to the workpiece, preferably continuously, such that the conductive particles of the dielectric liquid are deposited at the region to be modified and form an assisting electrode on the electrically non-conductive surface, wherein the dielectric liquid preferably fills the gap between the workpiece and the first working electrode; and e) applying an electric current to the first working electrode such that a plasma channel is generated between the first working electrode and the assisting electrode at the region to be modified, thereby modifying the workpiece via spark erosion.