Process for the production of ultrafine powders of metal oxides
US6503475B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2000 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | Nov 13, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the production of ultrafine powders that includes subjecting a mixture of precursor metal compound and a non-reactant diluent phase to mechanical milling whereby the process of mechanical activation reduces the microstructure of the mixture to the form of nano-sized grains of the metal compound uniformly dispersed in the diluent phase. The process also includes heat treating the mixture of nano-sized grains of the metal compound uniformly dispersed in the diluent phase to convert the nano-sized grains of the metal compound into a metal oxide phase. The process further includes removing the diluent phase such that the nano-sized grains of the metal oxide phase are left behind in the form of an ultrafine powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.