Method of making a long life high current density cathode from tungsten and iridium powders using a quaternary compound as the impregnant
US4957463A · kind A · utility
8Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1990 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Jan 2, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J23/04
- 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 by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a quaternary compound including barium, oxygen, a metal selected from the group consisting of osmium, iridium, rhodium, and rhenium, and a metal selected from the group consisting of strontium, calcium, scandium and titanium, 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.