Method for making high purity and free flowing metal oxides powder
US7931836B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2006 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Oct 15, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
According to aspects of the present invention, metal oxide powder, such as yttria and alumina powder (feed material), is processed using a plasma apparatus. The process generally consists of in-flight heating and melting of the feed material by the plasma apparatus. The plasma apparatus contains a plasma torch with required power supply and cooling systems, a powder feeder, a chamber to collect the powder and a dedusting system. The heated powder forms molten spherical droplets that are rapidly cooled under free fall conditions. The plasma densification process removes some impurity oxides, modifies the morphology of the particle and increases the apparent density of the powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.