Edged ceramic member, a punch for manufacturing a lead frame, a method of manufacturing lead frames and a method of manufacturing an edged ceramic member

摘要

A ceramic member is constituted with a zirconia-containing ceramic material containing 20% by volume or more of a zirconia series ceramic phase mainly composed of a zirconium oxide. The zirconia-containing ceramic material satisfies: KC/(d)≥5 by using an exponential value A set within a range from -0.41 to -0.37 width, d being an average grain size (unit: mu m) and KC being a fracture toughness value (unit: MPa . m<1/2>). An edge portion appearing in the form of a ridge is formed at an intersection between two edge forming surfaces 4a and 5 to the outer surface of the member, and the edge portion is formed as a sharp edge portion E having a width w of 0.15 mm or less for the top end of the edge appearing on a cross section taken along an arbitrary plane in perpendicular to the direction of the ridge.