Impregnated cathode

Details Impregnated cathode Impregnated cathode

1985-07-01

1986-12-02

Kittle, John E.

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Web or sheet containing structurally defined element or...

Physical dimension specified

428472, 428701, H01J 114

Patent

active

046264701

ABSTRACT:
An impregnated cathode comprising a refractory porous body impregnated with an electron emissive material and having an electron emissive surface, and a thin film disposed on the electron emissive surface and composed of a refractory metal and one of Sc, scandium oxide and a mixture thereof. The thin film containing Sc or scandium oxide is generated on the body in subsequent to impregnation of the electron emissive material into the refractory porous body with the result that a mono-atomic layer composed of Ba, Sc and O is maintained on the electron emissive surface over a long period of use.

REFERENCES:
patent: 4494035 (1985-01-01), Palluel et al.
patent: 4518890 (1985-05-01), Taguchi et al.

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