Electron tube cathode and method for producing the same

Details Electron tube cathode and method for producing the same Electron tube cathode and method for producing the same

H - Electricity

01

J

313/167

H01J 19/02 (2006.01) H01J 1/14 (2006.01) H01J 9/04 (2006.01)

Patent

CA 1101479

ABSTRACT OF THE DISCLOSURE An electron tube cathode in such a structure comprising a N1-W-Zr alloy (W content: 20-28 wt.%) having a grain size of 4-10 µm as a base metal, a 1,000-2,000?- thick Pt film provided on the surface of the base metal, and an electron emitting material layer consist- ing of alkaline earth metal oxide provided on the Pt film has less emission of lowering and less peeling of the electron emitting material layer, even if placed in a long time service. The electron tube cathode can be produced according to a method comprising i) a step of annealing a base metal of N1-W-Zr alloy (W content: 20-28 wt.%) at 1,000-1,200°C, ii) a step providing a 1,000-2,000 ? thick Pt film on the surface of the base metal, and iii) a step of providing an electron emitting material layer consisting of alkaline earth metal oxide on the Pt film.

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