Electron tube cathode

Details Electron tube cathode Electron tube cathode

1991-03-07

1992-06-02

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

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

313355, 252521, H01J 120

Patent

active

051189844

ABSTRACT:
A metal layer of not more than 2.0 .mu.m thick is formed on a base, containing nickel as the main ingredient and a reducing agent such as silicon and magnesium, by depositing tungsten by an electron beam under heating in a vacuum. The base is heat treated in a hydrogen atmosphere at 800.degree. to 1,100.degree. C. An emissive material layer, containing an alkali earth metal oxide and 0.01 to 25 wt % of a rare earth metal oxide, the alkali earth metal oxide containing at least barium oxide, is formed on the metal layer. Thus, life characteristics of the cathode, especially during the operation at a high current density such as not less than 2A/cm.sub.2, are greatly enhanced.

REFERENCES:
patent: 4313854 (1982-02-01), Sunahara et al.
patent: 4797593 (1989-01-01), Saito et al.
patent: 4864187 (1989-09-01), Sano et al.

Affiliated with

Also associated with

Rating

Electron tube cathode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electron tube cathode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron tube cathode will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2231286