Production of ferroboron by the silicon reduction of boric acid
US4602950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1985 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Sep 12, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C33/003
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This is a process for producing a ferroboron containing 0.5-20% silicon and up to 4.5% carbon. This process utilizes the silicon reduction of B.sub.2 O.sub.3 and avoids excessive losses due to volatilization of B.sub.2 O.sub.3. It also results in a ferroboron which is substantially free from aluminum impurity. The process uses a mixture, which includes an iron-containing constituent, a silicon containing constituent, and boric acid. Preferably a molten pool is prepared and controlled to a temperature of 1100-1550 (and preferably 1100.degree.-1450.degree. C.) prior to the addition of the boric acid. At least some of the silicon constituent can also be injected into the molten pool along with the boric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.