Thermionic emission cathodes
A thermionic emission cathode comprising a base metal made of nickel-tungsten series alloy, for example an alloy comprising 90 to 70% by weight of nickel and 10 to 30% by weight of tungsten, and an emitter layer, which is formed on the base, made from a mixture of tungsten powder or nickel-tungsten alloy powder comprising 90 to 70% by weight of nickel and 10 to 30% by weight of tungsten, Ba/sub 3/Wo/sub 6/ powder and (C) zirconium powder or ZrH/sub 2/ powder, and if necessary interposing a powder layer between the base and the emitter layer, said powder layer having the same composition as the base metal and a particle size of 1 to 10 ..mu..m sealed on the surface of the base with a distribution density of 0.5 to 5.0 mg/cm/sup 2/, can be applied to both directly and indirectly heated type cathodes. Said cathode has such advantages as being able to be miniaturized and to have high current density.
- Assignee:
- Hitachi Ltd (Japan)
- Patent Number(s):
- US 4279784
- OSTI ID:
- 5895167
- Resource Relation:
- Patent Priority Date: Priority date 26 Dec 1977, Japan
- Country of Publication:
- United States
- Language:
- English
Similar Records
INVESTIGATIONS OF CARBIDES AS CATHODES FOR THERMIONIC SPACE REACTORS. Final Report, May 15, 1961-August 31, 1962
INVESTIGATIONS OF CARBIDES AS CATHODES FOR THERMIONIC SPACE REACTORS. Fourth Interim Progress Report for the Period from March 1 through May 31, 1962
Related Subjects
FABRICATION
THERMIONIC EMITTERS
BARIUM COMPOUNDS
CATHODES
CHARGE DENSITY
LAYERS
MINIATURIZATION
NICKEL ALLOYS
POWDERS
TUNGSTEN
TUNGSTEN ALLOYS
ZIRCONIUM
ZIRCONIUM HYDRIDES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ELECTRODES
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
METALS
REFRACTORY METALS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
300403* - Thermionic Converters- Materials
Components
& Auxiliaries