Directly heated oxide cathode

Details Directly heated oxide cathode Directly heated oxide cathode

1976-07-30

1978-03-28

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

252521, H01J 114, H01J 1906, H01K 104

Patent

active

040817130

ABSTRACT:
A directly heated oxide cathode comprises a base metal of alloy containing Ni as a host material, an electron emissionable oxide of alkaline earth metal deposited on the base metal, and powders of metal selected from Ni sample substance, Co simple substance, Ni-Co alloy, alloy containing Ni, Ni-Co, or Co as a host material, and alloy containing Ni as a host material and a reducing agent such as Zr, deposited on both sides of the base metal onto which the oxide is deposited. Provision of the powders of metal on both sides can minimize deformation of the base metal and prevent peeling of the oxide from the cathode effectively. Provision of a reducing agent in the powders of metal further assures a sufficient supply of the reducing agent to the oxide, thereby effectively maintaining the electron emissionability and life of the oxide for a longer period of time.

REFERENCES:
patent: 3183396 (1965-05-01), Becker et al.
patent: 3240569 (1966-03-01), Buescher
patent: 3286119 (1966-11-01), Sugawara et al.
patent: 3351486 (1967-11-01), Buescher et al.
patent: 3374385 (1968-03-01), Lattimer
patent: 3558966 (1971-01-01), Hill
patent: 3745403 (1973-07-01), Misumi

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