Sintered Tantalum and Niobium capacitor pellets doped with Nitrogen, and method of making the same
US6447570B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Nov 30, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/052
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pellet for use in electrolytic capacitors is comprised of a powder selected from one of Tantalum and Niobium. The pellet is porous, free from oxygen, annealed by heat, and diffused with nitrogen with all these attributes being achieved in an oxygen free environment. The method of producing the pellet involves the steps of taking a powder selected from one of Tantalum and Niobium pressing the powder into a self-contained pellet; removing any oxygen in the pellet; annealing the pellet; and subjecting the pellet to nitrogen gas so that the nitrogen diffuses into the pellet to reduce DLC, with all these steps taking place in an oxygen free environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.