Impregnated cathode

Details Impregnated cathode Impregnated cathode

1983-01-06

1985-05-21

Chatmon, Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 252521, H01J 114, H01J 1906, H01K 104

Patent

active

045188904

ABSTRACT:
An impregnated cathode comprises a porous refractory substrate of refractory material such as tungsten containing at least one of scandium oxide particles and oxide particles containing scandium such as (Al, Sc).sub.2 O.sub.3, and an electron emissive material impregnated into pores of the substrate, and has an operating temperature lower by about 300.degree. C. than that of the conventional impregnated cathode containing no scandium oxide particles, or scandium.

REFERENCES:
patent: 3358178 (1967-12-01), Figner et al.
patent: 3719856 (1973-03-01), Koppius
patent: 3922428 (1975-11-01), Cronin
patent: 4007393 (1977-02-01), Van Stratum et al.
patent: 4350920 (1982-09-01), Bertens
patent: 4400648 (1983-08-01), Taguchi et al.

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