METHOD OF MANUFACTURING A DISPENSER CATHODE AND DISPENSER CATHODE MANUFACTURED ACCORDING TO SAID METHOD

摘要

A method of manufacturing a dispenser cathode in which a porous sintered molding of refractory metal impregnated with electron emissive material is embedded in a holder. The method consists of placing the molding in contact with a flat metal foil having a thickness of 10 to 100 microns and mechanically forming the metal foil into a holder surrounding the sides and the rear of the molding while leaving the front surface of the molding exposed by pressing the molding through an apertured die by means of a pressing tool. The molding acts as a plunger to draw the metal foil over the molding such that any gap between the molding and the sidewall of the holder is less than 10 microns wide.