Impregnated thermionic cathode

Details Impregnated thermionic cathode Impregnated thermionic cathode

1987-07-13

1989-03-07

Boudreau, Leo H.

Electric lamp and discharge devices

Electrode and shield structures

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

313348DC, 252515, H01J 114, H01J 1906

Patent

active

048109266

ABSTRACT:
An extremely long-life, highly reproducible cathode is produced by preparing a porous sintered metal matrix, impregnating the matrix with a reagent containing a transition metal to modify the surface structure of the matrix, and then impregnating the surface-modified metal matrix with a barium-containing reagent to produce a cathode structure in which barium atoms are held in a metal-metal interaction with the transition metals and the surface of the matrix. In a preferred embodiment, the transition metal oxide is TiO.sub.2. This produces a barium/transition metal oxide surface structure which permits cathode operating temperatures on the order of 650 degrees C. The barium is stable and is retained on the surface of the metal matrix, so further dispensing is not required.

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D. Norman et al., Surface Structure of Thermionic-Emission Cathodes, 58 Phys. Rev. Let. 519, Feb. 2, 1987.

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