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:

1989-11-20

Pagination or Media Count:

9.0

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