Treatment of tantalum powder
US4423004A · kind A · utility
17Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1983 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Mar 24, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F11/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Tantalum powder for electrolytic capacitors is treated with a non-aqueous solution of ammonium thiocyanate in N,N'-dimethylformamide or N-methylpyrrolidinone after the powder has been subjected to a thermal treatment in the absence of oxygen step and before the powder is exposed to an oxygen-containing fluid to prevent oxygen uptake by the powder. The thermal treatment step is carried out at 700.degree. C. and above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.