Dispenser cathode and manufacturing method therefor
US4982133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1989 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Nov 3, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cavity reservoir type dispenser cathode includes a first pellet, a second pellet, a cup and a sleeve, the first pellet being made by sintering a mixture of at least one metal selected from among W, Mo, Ta and alloys thereof, at least one metal selected from among Os, Ir, Ru, Re and alloys thereof, and Sc.sub.2 O.sub.3, the second pellet being made of a mixture of barium-calcium aluminate and In.sub.2 O.sub.3, the first and second pellets being inserted into a cup and the cup being inserted into and welded to a sleeve. The cavity reservoir type dispenser cathode of the present invention has a high saturation current density at lowered temperatures to prevent deformations and shortening of life expectancy of nearby components due to a high operating temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.