EP 0157634 B1 19880817 - TUNGSTEN-IRIDIUM IMPREGNATED CATHODE
Title (en)
TUNGSTEN-IRIDIUM IMPREGNATED CATHODE
Publication
Application
Priority
US 59578984 A 19840402
Abstract (en)
[origin: EP0157634A2] Porous agglomerates (14) are made from pure tungsten by sintering fine particles together and mechnically breaking down the mass to form some agglomerates (14) considerably larger than the particles. These agglomerates (14) are mixed with fine iridium powder (18) and sintered to form a porous mass. The mass is machined to the cathode shapes (10 min ) and impregnated with an alkaline earth aluminate (18). The large agglomerates (14) alloy with the iridium only on their outer surface. Their pure tungsten interior provides the surfaces to reduce the alkaline earth oxide to the metal which activates the cathode.
IPC 1-7
IPC 8 full level
H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01)
CPC (source: EP)
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0157634 A2 19851009; EP 0157634 A3 19860108; EP 0157634 B1 19880817; DE 3564511 D1 19880922; JP H0630214 B2 19940420; JP S60220529 A 19851105
DOCDB simple family (application)
EP 85302311 A 19850402; DE 3564511 T 19850402; JP 4668985 A 19850311