Direct heating cathode for high frequency thermionic tube

Details Direct heating cathode for high frequency thermionic tube Direct heating cathode for high frequency thermionic tube

1981-09-18

1984-01-31

Dixon, Harold

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313346R, H01J 116

Patent

active

044292503

ABSTRACT:
A direct heating thermionic emission cathode for high frequency tubes of the diode, tetrode or pentode type. It comprises a pyrolytic graphite support and a lanthanum hexaboride-based thermoemissive material, these elements being separated by a layer which constitutes a diffusion barrier and comprises a tantalum or hafnium carbide, a metal of the platinum group or a boron compound.

REFERENCES:
patent: 4137476 (1979-01-01), Ishii et al.
patent: 4178530 (1979-12-01), Lersmacher et al.
patent: 4274030 (1981-06-01), Buxbaum
patent: 4313854 (1982-02-01), Sunahara et al.

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