Method of forming fine dispersion of ceria in tungsten
US5284614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C1/1026
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Doped tungsten powder, or sintered tungsten bodies formed therefrom, having a fine dispersion of oxide particles of at least one metal from the group zirconium, hafnium, lanthanum, yttrium, and rare earth's are formed by the method of this invention. A mixture of a salt solution comprised of a soluble salt of the metal, and a tungsten blue oxide powder is formed. A hydroxide precipitating solution is admixed with the mixture to form a hydroxide precipitate of the metal on the tungsten blue oxide powder. The tungsten blue oxide powder and hydroxide precipitate are heated in a reducing atmosphere to form the tungsten powder having the dispersion of oxide particles. The doped tungsten powder can be consolidated and sintered to form tungsten bodies having a fine dispersion of the metal oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.