Method of making a long life high current density cathode from tungsten and iridium powders using a barium iridiate as the impregnant
US4735591A · kind A · utility
6Cited by
5References
7Claims
0Family size
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Key dates
| Filing date | Apr 15, 1987 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Apr 15, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A long life high current density cathode is made from a mixture of tungsten nd iridium powders using a barium iridiate as the impregnant by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a barium iridiate by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.