Process of forming an impregnated cathode

Details Process of forming an impregnated cathode Process of forming an impregnated cathode

1989-11-02

1991-01-22

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

427 77, 427348, H01J 904

Patent

active

049867881

ABSTRACT:
A cathode and a process of manufacturing the same are disclosed, the cathode comprising; a molybdenum cup having a convex portion, free barium atoms produced through reactions with an impregnation compound, a porous metal layer sealingly welded to the top of the cup, and a heating member having an uppermost head portion inserted into the lower space of the convex portion of the cup. According to the cathode of the present invention, the disadvantages of the conventional cathodes such as the speedy evaporation of barium during the initial stage, and the degrading of the performance and the shortening of the life expectancy due to the reaction byproducts produced in the porous metal layer can be overcome, while a quick start-up characteristics can also be obtained owing to the speedy diffusion of the barium.

REFERENCES:
patent: 4379979 (1983-04-01), Thomas et al.
patent: 4835052 (1989-05-01), Yamamoto
patent: 4894257 (1990-01-01), Smith et al.

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