Method of manufacturing a dispenser cathode; dispenser cathode m

Details Method of manufacturing a dispenser cathode; dispenser cathode m Method of manufacturing a dispenser cathode; dispenser cathode m

1988-07-05

1990-02-13

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

313346DC, H01J 904

Patent

active

049002856

ABSTRACT:
A method of producing a dispenser cathode provided with a top layer, in which a main body of tungsten powder is pressed to a moulding at a first pressing pressure which is sufficient to preserve the shape of the moulding when the first pressure is removed but is not sufficient to break the powder grains to a significant extent. This moulding is thereafter provided with a top layer of a second power, whereafter the overall assembly is compressed in a second pressing operation at a second, higher pressing pressure, at which pressure the powder grains are broken to a significant extent.

REFERENCES:
patent: 3723589 (1973-03-01), Kennedy
patent: 3842309 (1974-10-01), Van Stratum et al.
patent: 4400648 (1983-08-01), Taguchi et al.
patent: 4625142 (1986-11-01), van Esdonk et al.
patent: 4671777 (1987-06-01), van Esdonk et al.
patent: 4767372 (1988-08-01), Bossert et al.

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