Method of manufacturing a thermionic cathode structure

Details Method of manufacturing a thermionic cathode structure Method of manufacturing a thermionic cathode structure

1994-08-19

1996-04-16

Bradley, P. Austin

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 51, 313346DC, H01J 904

Patent

active

055076750

ABSTRACT:
A method of manufacturing a thermionic cathode structure comprises the steps of: (1) forming a mixture of (a) tungsten powder, (b) at least one of the group comprising alumina or zirconia or yttrium oxide powder, (c) alkaline earth metal carbonate powder, and (d) a binder, (2) pressing the mixture isostatically causing the mixture to adhere to form an electrically insulating body, (3) sintering the body in a dry hydrogen ambient thereby reducing the carbonate, and (4) coating the surface of the body or a portion of the surface with a poly-crystalline metal layer.

REFERENCES:
patent: 3970888 (1976-07-01), Tratiner
patent: 4303848 (1981-12-01), Shimizu et al.
patent: 4570099 (1986-02-01), Green
patent: 5126623 (1992-06-01), Choi
patent: 5236382 (1993-08-01), Oh

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