Tungsten-iridium impregnated cathode

Details Tungsten-iridium impregnated cathode Tungsten-iridium impregnated cathode

1986-04-11

1987-06-23

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313346DC, 252514, 252515, 445 51, H01J 114, H01J 1906

Patent

active

046755705

ABSTRACT:
Porous agglomerates are made from pure tungsten by sintering fine particles together and mechanically breaking down the mass to form some agglomerates considerably larger than the particles. These agglomerates are mixed with fine iridium powder and sintered to form a porous mass. The mass is machined to the cathode shapes and impregnated with an alkaline earth aluminate. The large agglomerates alloy with the iridium only on their outer surface. Their pure tungsten interior provides the surfaces to reduce the alkaline earth oxide to the metal which activates the cathode.

REFERENCES:
patent: 2700000 (1955-01-01), Levi
patent: 3373307 (1968-03-01), Zalm et al.
patent: 4165473 (1979-08-01), Falce
patent: 4417173 (1983-11-01), Tuck et al.
patent: 4518890 (1985-05-01), Taguchi et al.

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