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

1978-09-27

1981-04-07

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

75246, 313346R, 428548, 428670, 428680, H01J 114

Patent

active

042606659

ABSTRACT:
An electron tube cathode in such a structure comprising a Ni-W-Zr alloy (W content: 20-28 wt. %) having a grain size of 4-10 .mu.m as a base metal, a 1,000-2,000 A-thick Pt film provided on the surface of the base metal, and an electron emitting material layer consisting of alkaline earth metal oxide provided on the Pt film has less emission 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 Ni-W-Zr alloy (W content: 20-28 wt. %) at 1,000.degree.-1,200.degree. C., (ii) a step of providing a 1,000-2,000 A 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.

REFERENCES:
patent: 3166836 (1965-01-01), Bigler
patent: 3240569 (1966-03-01), Buescher
patent: 3558966 (1971-01-01), Hill
patent: 4129801 (1978-12-01), Soeno et al.

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