EP 0549034 B1 19950927 - Cathode and method of manufacture.
Title (en)
Cathode and method of manufacture.
Title (de)
Kathode und Verfahren zu ihrer Herstellung.
Title (fr)
Cathode et son procédé de fabrication.
Publication
Application
Priority
DE 4142535 A 19911221
Abstract (en)
[origin: EP0549034A1] The invention relates to a cathode having a matrix body (1) which is impregnated with an alkaline earth metal compound and to whose surface a cover layer (2, 3, 4) is applied which contains scandium and a refractory metal such as, in particular, tungsten. High emission at low operating temperature and, at the same time, rapid recovery after ion bombardment and a long service life are achieved by the cover layer containing at least two layers having different compositions, a purely metallic layer (5, 6, 7) being applied to the impregnated matrix body (1) which contains scandium and a refractory metal such as, in particular, tungsten and/or rhenium, and by there being applied as a final layer a metallic layer made of a refractory metal such as, in particular, tungsten. <IMAGE>
IPC 1-7
IPC 8 full level
C23C 16/50 (2006.01); H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01); H01J 19/22 (2006.01)
CPC (source: EP US)
H01J 1/28 (2013.01 - EP US); H01J 9/042 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0549034 A1 19930630; EP 0549034 B1 19950927; DE 4142535 A1 19930624; DE 59203841 D1 19951102; JP H05266786 A 19931015; US 5936334 A 19990810
DOCDB simple family (application)
EP 92203887 A 19921214; DE 4142535 A 19911221; DE 59203841 T 19921214; JP 34067792 A 19921221; US 33262094 A 19941031