Accession Number:

ADD014425

Title:

Method of Making a Long Life High Current Density Cathode from Tungsten and Iridium Powders Using a Quarternary Compound as the Impregnant.

Descriptive Note:

Patent Application, Filed 2 Jan 90,

Corporate Author:

DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s):

• Branovich, Louis E.
• Smith, Bernard
• Freeman, Gerard L.
• Eckart, Donald W.

Report Date:

1990-01-02

Pagination or Media Count:

8.0

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 porous billet, and then impregnating the billet with a quaternary compound including barium, oxygen, a metal selected from the group consisting of osmium, iridium, rhodium, and rhenium, and a metal selected from the group consisting of strontium, calcium, scandium and titanium, by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts. Patent applications. RRH

Descriptors:

• *IMPREGNATION
• *IRIDIUM
• *PATENT APPLICATIONS
• *POWDERS
• *PROCESSING
• *TUNGSTEN
• BARIUM
• BILLETS(MATERIALS)
• CALCIUM
• DRY MATERIALS
• FURNACES
• HYDROGEN
• MIXTURES
• OSMIUM
• OXYGEN
• POROUS MATERIALS
• QUATERNARY COMPOUNDS
• RHENIUM
• RHODIUM
• SCANDIUM
• STRONTIUM
• TITANIUM

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE