Accession Number : ADD014364

Title :   Method of Making a Long Life High Current Density Cathode from Tungsten and Iridium Powders Using a Mixture of Barium Peroxide and a Coated Emitter as the Impregnant.

Descriptive Note : Patent Application, Filed 20 Nov 89,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Branovich, Louis E ; Smith, Bernard ; Freeman, Gerard E ; Eckart, Donald W

Report Date : 20 Nov 1989

Pagination or Media Count : 9

Abstract : A long life high current density cathode is made from a mixture of tungsten and iridium powders by processing the mixture of powders with an activator into a porus billet, and then impregnating the billet with a mixture of barium peroxide and a coated emitter by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts. Patent applications; Powder metallurgy; Powder metals particle size; Coatings. (edc)

Descriptors :   *CATHODES, *PATENT APPLICATIONS, *POWDER METALS, BARIUM COMPOUNDS, BILLETS(MATERIALS), COATINGS, DRY MATERIALS, EMITTERS, FURNACES, HYDROGEN, IMPREGNATION, IRIDIUM, LIFE EXPECTANCY(SERVICE LIFE), MIXTURES, PARTICLE SIZE, PEROXIDES, POROSITY, POWDER METALLURGY, POWDERS, PROCESSING, TUNGSTEN

Subject Categories : Fabrication Metallurgy
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE