Oxide cathode

Details Oxide cathode Oxide cathode

1984-12-04

1990-02-27

Griffin, Robert L.

Electric lamp and discharge devices

Electrode and shield structures

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

313355, H01J 114

Patent

active

049048970

ABSTRACT:
An oxide cathode comprising a base 1 which consists substantially of titanium and a heater element 5 coated with aluminium oxide 6 to heat the base 1, which bears a porous alkaline earth metal oxide emissive layer 4. When the surface of the titanium base 1 which is opposed to the heater element 5 bears a metal layer 7 consisting at least of one of the metals Pt, Mo, Ta and W, a solution is obtained to the problem occurring in titanium cathodes in that titanium in contact with aluminium oxide is not chemically stable. The metal layer preferably consisits of pure tungsten and is formed by chemical vapour desposition (CVD). The metal layer is preferably from 1 to 10 .mu.m thick.

REFERENCES:
patent: 3553521 (1971-01-01), Bakker et al.
patent: 4371589 (1983-02-01), Warner et al.
patent: 4471260 (1984-09-01), Hasker et al.
patent: 4533852 (1985-08-01), Frank et al.

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