EP 0081270 A3 19840606 - PROCESS FOR PRODUCING A THERMIONIC CATHODE, AND THERMIONIC CATHODE MANUFACTURED BY THIS PROCESS
Title (en)
PROCESS FOR PRODUCING A THERMIONIC CATHODE, AND THERMIONIC CATHODE MANUFACTURED BY THIS PROCESS
Publication
Application
Priority
DE 3148441 A 19811208
Abstract (en)
[origin: ES8308449A1] The cathode (4) the material of which is substantially high-melting metal such as W, Mo, Ta, Nb, Re and/or C, consists of a very fine-grained mechanically stable support layer (5), a series of layers (6) considerably enriched with emissive material, in general from the scandium group especially from the group of rare earth metals, preferably with Th or compounds thereof and a thermally stable preferentially oriented coating layer (7). All the layers are provided via the gaseous phase, for example, CVD methods, on a substrate (1) formed according to the desired cathode geometry. The substrate (1) is removed after termination of the deposition. FIG. 2.
IPC 1-7
IPC 8 full level
H01J 1/13 (2006.01); H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01)
CPC (source: EP US)
Citation (search report)
- [A] GB 962926 A 19640708 - RANK BUSH MURPHY LTD
- [AD] DE 1439890 A1 19690417 - VARIAN ASSOCIATES
- [A] US 4019081 A 19770419 - BUXBAUM CHARLEY, et al
- [A] GB 1579249 A 19801119 - DENKI KAGAKU KOGYO KK
- [A] FR 2301914 A1 19760917 - PHILIPS NV [NL]
- [A] FR 2040505 A1 19710122 - GEN ELECTRIC
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0081270 A2 19830615; EP 0081270 A3 19840606; EP 0081270 B1 19861203; CA 1211737 A 19860923; DE 3148441 A1 19830721; DE 3274598 D1 19870115; ES 517938 A0 19830816; ES 8308449 A1 19830816; HU 194646 B 19880229; JP H0354415 B2 19910820; JP S58106735 A 19830625; US 4533852 A 19850806
DOCDB simple family (application)
EP 82201538 A 19821203; CA 416802 A 19821201; DE 3148441 A 19811208; DE 3274598 T 19821203; ES 517938 A 19821206; HU 391082 A 19821206; JP 21537682 A 19821208; US 44707982 A 19821206