Method of manufacturing a thermionic cathode and thermionic cath

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

1982-12-06

1985-08-06

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313352, 313355, 313292, 445 50, 445 51, H01J 128, H01J 113

Patent

active

045338523

ABSTRACT:
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.

REFERENCES:
patent: 2843517 (1958-07-01), Kerstetter et al.
patent: 3159461 (1964-12-01), MacNair
patent: 3488549 (1970-01-01), Amra
patent: 3558966 (1971-01-01), Hill et al.
patent: 4275123 (1981-06-01), Buxbaum et al.

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