EP 0441698 B1 19950927 - Impregnated cathode manufacturing procedure and cathode obtained therewith.
Title (en)
Impregnated cathode manufacturing procedure and cathode obtained therewith.
Title (de)
Herstellungsverfahren einer Impregnierungskathode und mittels eines solchen Verfahrens gewonnene Kathode.
Title (fr)
Procédé de fabrication d'une cathode imprégnée, et cathode obtenue par ce procédé.
Publication
Application
Priority
FR 9001518 A 19900209
Abstract (en)
[origin: EP0441698A1] The invention relates to a procedure for manufacturing an impregnated cathode for an electron tube and to the impregnated cathode obtained therewith. The method involves mixing (b) a powder (Y) containing the emissive element (generally aluminates of barium and calcium) with the powder (W) of at least one refractory element (generally tungsten, possibly mixed with a platinum ore metal). This is followed by pressing (c) the mixture to form a pellet (1) which is then sintered (d) at a high temperature (about 2000 DEG C) in a hydrogen atmosphere. In the prior art, a powder of at least one refractory metal was pressed and sintered, and then impregnated, machined, cleaned, etc. The method of the invention thus enables many stages in the manufacture of an impregnated cathode to be omitted in comparison with the prior art. <IMAGE>
IPC 1-7
IPC 8 full level
B22F 3/26 (2006.01); B22F 5/00 (2006.01); H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01)
CPC (source: EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0441698 A1 19910814; EP 0441698 B1 19950927; CA 2035170 A1 19910810; CA 2035170 C 20010529; DE 69113290 D1 19951102; DE 69113290 T2 19960307; FR 2658360 A1 19910816; FR 2658360 B1 19960814; HK 34097 A 19970327; JP 2710700 B2 19980210; JP H0785782 A 19950331; US 5334085 A 19940802
DOCDB simple family (application)
EP 91400272 A 19910205; CA 2035170 A 19910129; DE 69113290 T 19910205; FR 9001518 A 19900209; HK 34097 A 19970320; JP 3948191 A 19910208; US 88766392 A 19920526