Dispenser cathode

Details Dispenser cathode Dispenser cathode

1990-11-07

1992-05-19

DeMeo, Palmer C.

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 128

Patent

active

051151642

ABSTRACT:
A dispenser cathode comprises an electron emissive material containing BaAl.sub.4 and Ni, the porous metal base body and a sleeve. The activation aging time of the dispenser cathode according to the present invention is shortened greatly as compared with the conventional dispenser cathode and therefore, the productivity can be increased.

REFERENCES:
patent: 3159461 (1964-12-01), MacNair
patent: 3699378 (1972-10-01), Buescher et al.
patent: 4165473 (1979-08-01), Falce
patent: 4369392 (1983-01-01), Hotta et al.
patent: 4823044 (1989-04-01), Falce
Lipeles, R. A. and Kan, H. K. A., "Chemical Stability of Barium Calcium Aluminate Dispenser Cathode Impregnants," Applications of Surface Science 16 (1983) 189-206, North-Holland Publishing Company.

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