Process for the preparation of refined tantalum or niobium
US4727928A · kind A · utility
17Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Jul 8, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B34/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Tantalum or niobium in the form of powder or pieces containing volatile impurities, e.g. sodiothermic tantalum powder, is first converted into crude cast metal by plasma melting and then the crude cast metal is refined by electron beam melting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.