Thermionic cathode of high emissive power for an electric tube,

Details Thermionic cathode of high emissive power for an electric tube, Thermionic cathode of high emissive power for an electric tube,

1987-03-05

1988-06-21

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 313337, 252514, H01J 114

Patent

active

047527137

ABSTRACT:
A reactionless thermionic cathode for electronic tubes consists of a metallic or ceramic support and an alloy, preferably an intermetallic compound, containing the actual emission-promoting element, with a metal from the group comprising those of the VIIIth vertical row of the periodic table and rhenium. The preferred activation substances are platinides of the elements having a low electron work function, predominantly Ba and La. The cathode is manufactured by wet-mechanical, cataphoretic or electroplating application of the activation substance to the support or by infiltration of the porous support having a pore volume of at least 10%. High emission current densities are obtained at relatively low operating temperatures.

REFERENCES:
patent: 3684912 (1972-08-01), Cheney et al.
patent: 4019081 (1977-04-01), Buxbaum et al.
patent: 4274030 (1981-06-01), Buxbaum
patent: 4291252 (1981-09-01), Aida et al.
patent: 4310777 (1982-01-01), Fukushima et al.
patent: 4393328 (1983-07-01), Shroff et al.
patent: 4429250 (1984-01-01), Clerc et al.
patent: 4533852 (1985-08-01), Frank et al.

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