Sputtered scandate coatings for dispenser cathodes and methods f

Details Sputtered scandate coatings for dispenser cathodes and methods f Sputtered scandate coatings for dispenser cathodes and methods f

1990-12-21

1991-08-20

Nguyen, Nam X.

Electric lamp and discharge devices

Electrode and shield structures

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

20419215, 427 77, H01J 1906

Patent

active

050417576

ABSTRACT:
A low work function surface for a dispenser cathode structure. The cathode structure comprising a heater and an electron emitting surface substrate or core composed of a porous tungsten matrix impregnated with a barium containing impregnant distributed therethrough. The structure is made by a method in which a nanometer thick layer of scandium oxide is sputtered onto the outermost surface of the impregnated tungsten core, or substrate, and then oxidized by exposing the sputtered scandium oxide surface layer to an oxygen atmosphere. The oxidized surface layer is activated by turning on the heater, for example, to cause the release of a small portion of the barium in the barium-containing impregnant. Some of the released barium migrates into the scandium oxide surface layer to form a monolayer of barium oxide on at least a portion thereof.

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