Method for fabricating an impregnated type cathode
US5096450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1991 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Mar 26, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/042
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for fabricating an impregnated type cathode comprises the steps of mixing metal powder having a high melting point and a heat proof property, and electron emission substance powder in a dry state, pressing the mixed powder to provide a pressed mixture, and applying an isostatic pressure to the pressed mixture contained in a sealed capsule. At the mixing stage, the metal powder is heated by a high temperature lower than the melting point, and at the mixing stage, a sintered mixture is obtained. In this method, the steps are simplified and decreased in number to decrease a fabricating cost. Furthermore, no influence occurs in electron emission due to hydrooxides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.