Vacuum electron tube having an oxide cathode comprising chromium

Details Vacuum electron tube having an oxide cathode comprising chromium Vacuum electron tube having an oxide cathode comprising chromium

1984-11-27

1990-02-27

Boudreau, Leo H.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313346R, 313270, A01J 120

Patent

active

049048961

ABSTRACT:
In a vacuum electron tube, a novel oxide cathode comprising a metal substrate, means for heating said substrate to its operating temperature, and a layer of alkaline-earth-metal oxide on the substrate. The substrate is essentially free from silicon and contains operative concentrations greater than 1.0 weight % of chromium metal for progressively migrating into the oxide layer and reducing the oxide to yield alkaline-earth-metal.

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patent: 4388551 (1983-06-01), Ray
A. M. Bounds et al., "Nickel Alloys for Oxide-Coated Cathodes," Proceedings of the I.R.E., 39, 788-799 (1951).

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