Controlled porosity sheet for thermionic dispenser cathode and m

Details Controlled porosity sheet for thermionic dispenser cathode and m Controlled porosity sheet for thermionic dispenser cathode and m

1981-02-06

1983-04-12

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

313337, 313346DC, 427 77, 428596, H01J 114, H01J 1906, H01K 104

Patent

active

043799795

ABSTRACT:
A controlled porosity sheet defining a surface for a thermionic dispenser thode and a method of manufacture. Starting with a generally flat silicon template substrate structure having an array of upstanding microposts 1-25 microns across on 5-100 micron spacings from each other, a layer of metal is deposited on the substrate to surround the microposts and cover the substrate structure to a desired depth. The metal layer is then abraded to a smooth, flat surface which exposes the microposts. Thereafter, the silicon substrate and microposts are completely etched away, leaving a metal sheet having micron-size holes therethrough.

REFERENCES:
patent: 3226265 (1969-08-01), Reuschel et al.
patent: 3753025 (1972-04-01), Van Stratum et al.
patent: 3879830 (1973-06-01), Buescher
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4165473 (1979-10-01), Falce
patent: 4254357 (1981-03-01), Haas et al.
patent: 4310603 (1982-01-01), Falce

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