Method of manufacturing a dispenser cathode; dispenser cathode manufactured according to the method, and device incorporating such a cathode
US4900285A · kind A · utility
6Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Jul 5, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of producing a dispenser cathode provided with a top layer, in which a main body of tungsten powder is pressed to a moulding at a first pressing pressure which is sufficient to preserve the shape of the moulding when the first pressure is removed but is not sufficient to break the powder grains to a significant extent. This moulding is thereafter provided with a top layer of a second power, whereafter the overall assembly is compressed in a second pressing operation at a second, higher pressing pressure, at which pressure the powder grains are broken to a significant extent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.