Method of manufacturing a thermionic cathode and thermionic...

Details Method of manufacturing a thermionic cathode and thermionic... Method of manufacturing a thermionic cathode and thermionic...

H - Electricity

01

J

204/96.07

H01J 1/14 (2006.01) C25D 1/02 (2006.01) H01J 9/04 (2006.01)

Patent

CA 1211737

39 ABSTRACT: A thermionic cathode, 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, a series of layers considerably enriched with emissive material, in general from the scan- dium group especially from the group of rare earth metals, preferably with Th or compounds thereof and a thermally stable preferentially oriented coating layer. All the layers are provided via the gaseous phase, for example, CVD methods, on a substrate formed according to the desired cathode geometry. The subsrate is removed after termina- tion of the deposition.

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