Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining

摘要

An electrically conductive rim zone is produced on sintered silicon carbide ceramic workpieces by exposing the workpieces, during sintering in a vacuum sintering furnace, to an additional holding time of 60-150 mins. at 1900-2150 deg.C. so that an electrically conductive carbon layer is formed over the entire workpiece surface. ADVANTAGE - The workpieces can be directly machined by electro-erosion without the need for application of a conductive starting layer or introduction of a conductive phase