Method of manufacturing scandate cathode with scandium oxide fil

Details Method of manufacturing scandate cathode with scandium oxide fil Method of manufacturing scandate cathode with scandium oxide fil

1990-02-16

1991-11-12

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

H01J 904

Patent

active

050643975

ABSTRACT:
For maintaining a monolayer of scandium which is necessary for a satisfactory emission on the surface of a scandate cathode, at least the top layer of the cathode is provided with scandium coated with a scandium oxide film. Even after repeated ion bombardment the emission is found to recover up to approximately 90% of the initial value at a current density of ca. 100 A/cm.sup.2.

REFERENCES:
patent: 4594220 (1986-06-01), Hasker et al.
patent: 4625142 (1986-11-01), van Esdonk
patent: 4626470 (1986-12-01), Yamamoto et al.
patent: 4873052 (1989-10-01), Hasker et al.

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