Direct heating cathode and a process for manufacturing same

Details Direct heating cathode and a process for manufacturing same Direct heating cathode and a process for manufacturing same

1982-01-12

1986-03-18

Sikes, William L.

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 114, H01J 1906, H01K 104

Patent

active

045771340

ABSTRACT:
The invention provides a direct heating thermo-electronic emission cathode comprising a pyrolytic graphite support and an emissive coating formed of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part into tungsten hermicarbide.

REFERENCES:
patent: 3389977 (1968-06-01), Tarver
patent: 3719856 (1973-03-01), Koppius
patent: 4002940 (1977-01-01), Ekkelboom et al.
patent: 4019081 (1977-04-01), Buxbaum et al.
patent: 4143295 (1979-03-01), Oguro
patent: 4178530 (1979-12-01), Lersmacher et al.

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