Method of making a long life high current density cathode from t

Details Method of making a long life high current density cathode from t Method of making a long life high current density cathode from t

1990-01-02

1990-09-18

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 51, H01J 904

Patent

active

049574639

ABSTRACT:
A long life high current density cathode is made from a mixture of tungsten nd 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.

REFERENCES:
patent: 4735591 (1988-04-01), Branovich et al.
patent: 4863410 (1989-09-01), Branovich et al.
patent: 4894257 (1990-01-01), Smith et al.
patent: 4910079 (1990-03-01), Shroff et al.

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