Method of manufacturing an impregnation type cathode

Details Method of manufacturing an impregnation type cathode Method of manufacturing an impregnation type cathode

1993-01-22

1995-05-23

Rowan, Kurt

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 59, 134 3, H01J 904

Patent

active

054176000

ABSTRACT:
A manufacturing method of an impregnation type cathode for removing emitter material remaining on the porous sintered body pellets, includes steps for impregnating the emitter material into void spaces between the porous sintered body pellets, heating a phosphoric compound in a vessel up to the temperature in a range of about 100.degree. C. to about 300.degree. C., and dipping the impregnated emitter material into the heated phosphoric compound. The manufacturing method of the present invention creates a cathode which operates stably for a long time with high current density because there is no damage caused when the remaining emitter material is removed from the surface of the porous sintered body pellets.

REFERENCES:
patent: 2199712 (1940-05-01), Neilson
patent: 2700000 (1955-01-01), Levi et al.
patent: 3538570 (1970-11-01), Koppius
patent: 3607398 (1971-09-01), Lucas
patent: 4007393 (1977-02-01), van Stratum et al.
patent: 4406639 (1983-09-01), Williams
patent: 4410393 (1983-10-01), Russell et al.
patent: 5236382 (1993-08-01), Oh

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