Directly heated cathode

Details Directly heated cathode Directly heated cathode

1980-12-24

1987-01-13

Chatmon, Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 313311, H01J 114, H01J 1906, H01K 104

Patent

active

046366814

ABSTRACT:
In a directly heated cathode including a base formed of an alloy containing nickel as its principal component and coated with an oxide of an alkaline earth metal which emits electrons, a layer of a metal selected from the group consisting of nickel, cobalt, platinum and rhodium or of an alloy containing one of these metals as its principal component is formed on both surfaces of the base to one of which surfaces the coating of the oxide is applied, so as to thereby prevent the peeling-off of the coating of the oxide from the base. In order to avoid deformation of the base, a powder alloy containing tungsten and nickel as its principal components, a powder alloy containing molybdenum and nickel as its principal components or one of these powder alloys which is coated with nickel, cobalt or a cobalt-nickel alloy is deposited on the surface of the base to which the coating of the oxide is applied.

REFERENCES:
patent: 3240569 (1966-03-01), Buescher
patent: 4081713 (1978-03-01), Misumi
patent: 4129801 (1978-12-01), Soeno et al.

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