Method of Making a Long Life High Current Density Cathode from Tungsten and Iridium Powders Using a Quarternary Compound as the Impregnant.
Patent Application, Filed 2 Jan 90,
DEPARTMENT OF THE ARMY WASHINGTON DC
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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
- Electrical and Electronic Equipment