Method of making a cathode from tungsten and iridium powders using a reaction product from reacting barium peroxide with an excess of tungsten as the impregnant
The general object of this invention is to provide an improved method of making a long-life high-current density-cathode. A more-particular object of the invention is to provide such a method that will be rapid and in which the resulting emission over a set time period will be sufficient. It has now been found that such a method can be provided by making such a cathode from a mixture of tungsten and iridium powders to form a porous billet and using a reaction product formed from reacting barium peroxide with an excess of tungsten as the impregnant for the porous billet. By an excess of tungsten is meant that the molar ratio of barium peroxide to tungsten in forming the impregnant is less than 3 to 1.
- Research Organization:
- Department of the Army, Washington, DC (USA)
- Assignee:
- Department of the Army, Washington, DC (USA)
- Patent Number(s):
- A US 7-401202
- OSTI ID:
- 5226155
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CATHODES
CHALCOGENIDES
DISPERSIONS
ELECTRODES
ELEMENTS
IRIDIUM
MATERIALS
METALLURGY
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POROUS MATERIALS
POWDER METALLURGY
POWDERS
TRANSITION ELEMENTS
TUNGSTEN