Impregnated cathode

Details Impregnated cathode Impregnated cathode

1988-11-18

1990-05-22

Boudreau, Leo H.

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 313366, 313338, 313337, H01J 114

Patent

active

049280341

ABSTRACT:
According to the present invention, an impregnated cathode is provided wherein an alloy layer of iridium and tungsten is formed on a surface of a porous pellet impregnated with an oxide of an alkali earth metal, wherein a crystal structure of the alloy has an .epsilon.II phase comprising an hcp structure whose lattice constants a and c satisfy 2.76.ltoreq.a.ltoreq.2.78 and 4.44.ltoreq.c.ltoreq.4.46, respectively. The impregnated cathode of the present invention maintains stable electron emission characteristics from an early stage of operation.

REFERENCES:
patent: 4165473 (1979-08-01), Falce
patent: 4208208 (1980-06-01), Misumi et al.
patent: 4417173 (1983-11-01), Tuck et al.
patent: 4518890 (1985-05-01), Taguchi et al.
patent: 4675570 (1987-06-01), Green
Extended Abstract of the 32nd Spring Meeting of the Japan Socient of Applied Physics & Related Societies 29P-R-3-, M. Nikaido et al; Mar. 29, 1985.

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