Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Patent
1996-10-07
1997-09-09
O'Shea, Sandra L.
Electric lamp and discharge devices
Electrode and shield structures
Cathodes containing and/or coated with electron emissive...
313346R, H01J 114
Patent
active
056660227
ABSTRACT:
A method of manufacturing a dispenser cathode, in which method a powder of a refractory metal and a scandium-containing powder are mixed with each other and pressed to form a cathode body. According to the invention at least both these powders and a suitable binder are mixed with each other to form a homogeneous suspension prior to the pressing operation and the whole mixture is subsequently cured and ground to granules having a larger average size and hence a greater fluidity than the grains of the starting powders. Subsequently the granules thus obtained are pressed to form a cathode body (2). The invention leads to a better processibility and greater convenience of handling of the starting powders so that notably very fine starting powders can be used, which results in cathodes (1) having a better recovery after ion bombardment as compared with cathodes manufactured in conventional manners which are necessarily based on relatively coarse powders.
REFERENCES:
patent: 4274030 (1981-06-01), Buxbaum
patent: 4400648 (1983-08-01), Taguchi et al.
patent: 4436651 (1984-03-01), Corneille
patent: 4518890 (1985-05-01), Taguchi et al.
Deckers Jacobus A. J. M.
Manenschijn Albert
Snijkers Franciscus M. M.
Van Der Heide Petrus A. M.
Weekers Theodorus H.
Fox John C.
O'Shea Sandra L.
Patel Vip
U.S. Philips Corporation
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