Method for manufacturing impregnated cathodes

Details Method for manufacturing impregnated cathodes Method for manufacturing impregnated cathodes

1992-04-21

1992-12-15

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

313346DC, H01J 904, H01J 1906

Patent

active

051711800

ABSTRACT:
A method for manufacturing an impregnated cathode wherein an impregnated pallet is fixedly fitted in a cathode cup. The method comprises the step of disposing electron emitting materials together with a porous pallet in the cathode cup and impregnating the electron emitting materials in the porous pallet to produce the impregnated pallet. The cathode cup is constituted by alloying an oxidative metal or alloy, such as silicon (Si), nickel (Ni) or chromium (Cr), which tends to react oxidatively with the electron emitting materials, in a high heat-resistant metal. In the impregnation process, a bonding of the impregnated pallet to the cathode cup can be achieved by an oxidation reaction between the electron emitting matetrials in the impregnated pallet and the oxidative material in the cathode cup, without any expensive brazing metals or alloys. As a result, it is possible to reduce the manufacturing cost and the total manufacturing processes.

REFERENCES:
patent: 2813220 (1957-11-01), Coppola
patent: 2869017 (1959-01-01), Levi
patent: 2912611 (1959-11-01), Beck et al.
patent: 3238596 (1966-03-01), Rich et al.

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