Process for preparing mixed zirconium and yttrium oxide powders
US5139766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Feb 21, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/82
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Mixed zirconium and yttrium oxides (ZrO.sub.2 (Y.sub.2 O.sub.3)) with a yttrium content (evaluated as metal) from about 15 to about 21% by weight, as powders in cubic crystal form, are prepared by: PA0 mixing an aqueous solution of zirconium and yttrium carboxylates with an organic solvent in the form of a nitrile or alcohol; PA0 from said mixture, precipitating solid particles of the precursors of mixed zirconium and yttrium oxides by operating at a pH between 5 and 7 and at ambient or close to ambient temperature; and PA0 calcining said precipitated solid particles at high temperature to directly transform them from the amorphous state to the cubic crystal form. The mixed zirconium and yttrium oxides obtained in this manner are suitable for use in the ceramics sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.