Impregnated cathode

Details Impregnated cathode Impregnated cathode

1987-05-28

1988-11-08

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

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

313630, 313632, 252515, 252521, H01J 1902, H01J 1906

Patent

active

047836130

ABSTRACT:
An impregnated cathode comprising a refractory porous body whose pore parts are impregnated with an electron emissive material including barium and a thin film layer comprising tungsten, scandium and/or an oxide of scandium, deposited on the surface of the refractory porous body, characterized in that the thin film layer contains an oxide of tungsten, and/or an oxide of tungsten and scandium, has a distinguished electron emission property and a long life.

REFERENCES:
patent: 4518890 (1985-05-01), Taguchi et al.
patent: 4594220 (1986-06-01), Hasker et al.
patent: 4625142 (1986-11-01), Van Esdonk et al.

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